coreboot-kgpe-d16/util/crossgcc/patches/gcc-5.3.0_riscv.patch

--- original-gcc/gcc/config.gcc
+++ gcc-5.3.0/gcc/config.gcc
@@ -439,6 +439,10 @@ powerpc*-*-*)
 	esac
 	extra_options="${extra_options} g.opt fused-madd.opt rs6000/rs6000-tables.opt"
 	;;
+riscv*)
+	cpu_type=riscv
+	need_64bit_hwint=yes
+	;;
 rs6000*-*-*)
 	extra_options="${extra_options} g.opt fused-madd.opt rs6000/rs6000-tables.opt"
 	;;
@@ -1982,6 +1986,34 @@ microblaze*-*-elf)
 	cxx_target_objs="${cxx_target_objs} microblaze-c.o"
 	tmake_file="${tmake_file} microblaze/t-microblaze"
         ;;
+riscv32*-*-linux*)
+	tm_file="elfos.h gnu-user.h linux.h glibc-stdint.h riscv/default-32.h ${tm_file} riscv/linux.h riscv/linux64.h"
+	tmake_file="${tmake_file} riscv/t-linux64"
+	gnu_ld=yes
+	gas=yes
+	gcc_cv_initfini_array=yes
+	;;
+riscv*-*-linux*)
+	tm_file="elfos.h gnu-user.h linux.h glibc-stdint.h ${tm_file} riscv/linux.h riscv/linux64.h"
+	tmake_file="${tmake_file} riscv/t-linux64"
+	gnu_ld=yes
+	gas=yes
+	gcc_cv_initfini_array=yes
+	;;
+riscv32*-*-elf*)
+	tm_file="elfos.h newlib-stdint.h riscv/default-32.h ${tm_file} riscv/elf.h"
+	tmake_file="${tmake_file} riscv/t-elf"
+	gnu_ld=yes
+	gas=yes
+	gcc_cv_initfini_array=yes
+	;;
+riscv*-*-elf*)
+	tm_file="elfos.h newlib-stdint.h ${tm_file} riscv/elf.h"
+	tmake_file="${tmake_file} riscv/t-elf"
+	gnu_ld=yes
+	gas=yes
+	gcc_cv_initfini_array=yes
+	;;
 mips*-*-netbsd*)			# NetBSD/mips, either endian.
 	target_cpu_default="MASK_ABICALLS"
 	tm_file="elfos.h ${tm_file} mips/elf.h netbsd.h netbsd-elf.h mips/netbsd.h"
@@ -3866,6 +3898,31 @@ case "${target}" in
 		done
 		;;
 
+	riscv*-*-*)
+		supported_defaults="abi arch arch_32 arch_64 float tune tune_32 tune_64"
+
+		case ${with_float} in
+		"" | soft | hard)
+			# OK
+			;;
+		*)
+			echo "Unknown floating point type used in --with-float=$with_float" 1>&2
+			exit 1
+			;;
+		esac
+
+		case ${with_abi} in
+		"" | 32 | 64)
+			# OK
+			;;
+		*)
+			echo "Unknown ABI used in --with-abi=$with_abi" 1>&2
+			exit 1
+			;;
+		esac
+
+    ;;
+
 	mips*-*-*)
 		supported_defaults="abi arch arch_32 arch_64 float fpu nan fp_32 odd_spreg_32 tune tune_32 tune_64 divide llsc mips-plt synci"
 
--- original-gcc/gcc/configure
+++ gcc-5.3.0/gcc/configure
@@ -23717,6 +23717,25 @@ x3:	.space 4
 	tls_first_minor=14
 	tls_as_opt="-a32 --fatal-warnings"
 	;;
+  riscv*-*-*)
+    conftest_s='
+	.section .tdata,"awT",@progbits
+x:
+	.word 2
+	.text
+	la.tls.gd a0,x
+	la.tls.ie a1,x
+	lui a0,%tls_ie_pcrel_hi(x)
+	lw a0,%pcrel_lo(x)(a0)
+	add a0,a0,tp
+	lw a0,0(a0)
+	lui a0,%tprel_hi(x)
+	add a0,a0,tp,%tprel_add(x)
+	lw a0,%tprel_lo(x)(a0)'
+	tls_first_major=2
+	tls_first_minor=21
+	tls_as_opt='-m32 --fatal-warnings'
+	;;
   s390-*-*)
     conftest_s='
 	.section ".tdata","awT",@progbits
--- original-gcc/gcc/configure.ac
+++ gcc-5.3.0/gcc/configure.ac
@@ -3263,6 +3263,25 @@ x3:	.space 4
 	tls_first_minor=14
 	tls_as_opt="-a32 --fatal-warnings"
 	;;
+  riscv*-*-*)
+    conftest_s='
+	.section .tdata,"awT",@progbits
+x:
+	.word 2
+	.text
+	la.tls.gd a0,x
+	la.tls.ie a1,x
+	lui a0,%tls_ie_pcrel_hi(x)
+	lw a0,%pcrel_lo(x)(a0)
+	add a0,a0,tp
+	lw a0,0(a0)
+	lui a0,%tprel_hi(x)
+	add a0,a0,tp,%tprel_add(x)
+	lw a0,%tprel_lo(x)(a0)'
+	tls_first_major=2
+	tls_first_minor=21
+	tls_as_opt='-m32 --fatal-warnings'
+	;;
   s390-*-*)
     conftest_s='
 	.section ".tdata","awT",@progbits
--- original-gcc/gcc/testsuite/gcc.c-torture/execute/20101011-1.c
+++ gcc-5.3.0/gcc/testsuite/gcc.c-torture/execute/20101011-1.c
@@ -6,6 +6,9 @@
 #elif defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) || defined (__POWERPC__) || defined (__ppc)
   /* On PPC division by zero does not trap.  */
 # define DO_TEST 0
+#elif defined (__riscv__)
+  /* On RISC-V division by zero does not trap.  */
+# define DO_TEST 0
 #elif defined (__SPU__)
   /* On SPU division by zero does not trap.  */
 # define DO_TEST 0
--- original-gcc/gcc/testsuite/gcc.dg/20020312-2.c
+++ gcc-5.3.0/gcc/testsuite/gcc.dg/20020312-2.c
@@ -66,6 +66,8 @@ extern void abort (void);
 # else
 #  define PIC_REG  "30"
 # endif
+#elif defined(__riscv__)
+/* No pic register.  */
 #elif defined(__RX__)
 /* No pic register.  */
 #elif defined(__s390__)
--- original-gcc/gcc/testsuite/gcc.dg/20040813-1.c
+++ gcc-5.3.0/gcc/testsuite/gcc.dg/20040813-1.c
@@ -2,7 +2,7 @@
 /* Contributed by Devang Patel  <dpatel@apple.com>  */
 
 /* { dg-do compile } */
-/* { dg-skip-if "No stabs" { aarch64*-*-* mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* tile*-*-* nios2-*-* *-*-vxworks* nvptx-*-* } { "*" } { "" } } */
+/* { dg-skip-if "No stabs" { aarch64*-*-* mmix-*-* *-*-aix* alpha*-*-* hppa*64*-*-* ia64-*-* riscv*-*-* tile*-*-* nios2-*-* *-*-vxworks* nvptx-*-* } { "*" } { "" } } */
 /* { dg-options "-gstabs" } */
 
 int
--- original-gcc/gcc/testsuite/gcc.dg/stack-usage-1.c
+++ gcc-5.3.0/gcc/testsuite/gcc.dg/stack-usage-1.c
@@ -61,6 +61,8 @@
 #  else
 #    define SIZE 240
 #  endif
+#elif defined (__riscv__)
+#  define SIZE 240
 #elif defined (__AVR__)
 #  define SIZE 254
 #elif defined (__s390x__)
--- original-gcc/libatomic/configure.tgt
+++ gcc-5.3.0/libatomic/configure.tgt
@@ -33,6 +33,7 @@ case "${target_cpu}" in
 	ARCH=alpha
 	;;
   rs6000 | powerpc*)	ARCH=powerpc ;;
+  riscv*)		ARCH=riscv ;;
   sh*)			ARCH=sh ;;
 
   arm*)
--- original-gcc/libgcc/config.host
+++ gcc-5.3.0/libgcc/config.host
@@ -167,6 +167,9 @@ powerpc*-*-*)
 	;;
 rs6000*-*-*)
 	;;
+riscv*)
+	cpu_type=riscv
+	;;
 sparc64*-*-*)
 	cpu_type=sparc
 	;;
@@ -1064,6 +1067,14 @@ powerpcle-*-eabi*)
 	tmake_file="${tmake_file} rs6000/t-ppccomm rs6000/t-crtstuff t-crtstuff-pic t-fdpbit"
 	extra_parts="$extra_parts crtbegin.o crtend.o crtbeginS.o crtendS.o crtbeginT.o ecrti.o ecrtn.o ncrti.o ncrtn.o"
 	;;
+riscv*-*-linux*)
+	tmake_file="${tmake_file} riscv/t-fpbit riscv/t-dpbit riscv/t-tpbit riscv/t-elf riscv/t-elf${host_address}"
+	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o crtendS.o crtbeginT.o"
+	;;
+riscv*-*-*)
+	tmake_file="${tmake_file} riscv/t-fpbit riscv/t-dpbit riscv/t-elf riscv/t-elf${host_address}"
+	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o"
+	;;
 rs6000-ibm-aix4.[3456789]* | powerpc-ibm-aix4.[3456789]*)
 	md_unwind_header=rs6000/aix-unwind.h
 	tmake_file="t-fdpbit rs6000/t-ppc64-fp rs6000/t-slibgcc-aix rs6000/t-ibm-ldouble"
--- original-gcc/libsanitizer/asan/asan_linux.cc
+++ gcc-5.3.0/libsanitizer/asan/asan_linux.cc
@@ -213,6 +213,11 @@ void GetPcSpBp(void *context, uptr *pc,
   *pc = ucontext->uc_mcontext.gregs[31];
   *bp = ucontext->uc_mcontext.gregs[30];
   *sp = ucontext->uc_mcontext.gregs[29];
+# elif defined(__riscv__)
+  ucontext_t *ucontext = (ucontext_t*)context;
+  *pc = ucontext->uc_mcontext.gregs[REG_PC];
+  *bp = ucontext->uc_mcontext.gregs[REG_S0];
+  *sp = ucontext->uc_mcontext.gregs[REG_SP];
 #else
 # error "Unsupported arch"
 #endif
--- original-gcc/libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cc
+++ gcc-5.3.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cc
@@ -61,7 +61,8 @@ namespace __sanitizer {
 }  // namespace __sanitizer
 
 #if !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__aarch64__)\
-                            && !defined(__mips__) && !defined(__sparc__)
+                            && !defined(__mips__) && !defined(__sparc__)\
+                            && !defined(__riscv__)
 COMPILER_CHECK(struct___old_kernel_stat_sz == sizeof(struct __old_kernel_stat));
 #endif
 
--- original-gcc/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
+++ gcc-5.3.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -72,6 +72,10 @@ namespace __sanitizer {
   const unsigned struct_kernel_stat_sz = 144;
   #endif
   const unsigned struct_kernel_stat64_sz = 104;
+#elif defined(__riscv__)
+  const unsigned struct___old_kernel_stat_sz = 0;
+  const unsigned struct_kernel_stat_sz = 128;
+  const unsigned struct_kernel_stat64_sz = 128;
 #elif defined(__sparc__) && defined(__arch64__)
   const unsigned struct___old_kernel_stat_sz = 0;
   const unsigned struct_kernel_stat_sz = 104;
@@ -511,7 +515,7 @@ namespace __sanitizer {
   typedef long __sanitizer___kernel_off_t;
 #endif
 
-#if defined(__powerpc__) || defined(__mips__)
+#if defined(__powerpc__) || defined(__mips__) || defined(__riscv__)
   typedef unsigned int __sanitizer___kernel_old_uid_t;
   typedef unsigned int __sanitizer___kernel_old_gid_t;
 #else
diff -ru gcc-5.1.0.orig/libsanitizer/sanitizer_common/sanitizer_platform.h gcc-5.1.0/libsanitizer/sanitizer_common/sanitizer_platform.h
--- gcc-5.1.0.orig/libsanitizer/sanitizer_common/sanitizer_platform.h	2015-05-13 19:36:27.061421043 -0700
+++ gcc-5.3.0/libsanitizer/sanitizer_common/sanitizer_platform.h	2015-05-13 19:44:19.274355577 -0700
@@ -98,9 +98,9 @@
 
 // The AArch64 linux port uses the canonical syscall set as mandated by
 // the upstream linux community for all new ports. Other ports may still
-// use legacy syscalls.
+// use legacy syscalls.  The RISC-V port also does this.
 #ifndef SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
-# if defined(__aarch64__) && SANITIZER_LINUX
+# if (defined(__aarch64__) || defined(__riscv__)) && SANITIZER_LINUX
 # define SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 1
 # else
 # define SANITIZER_USES_CANONICAL_LINUX_SYSCALLS 0
diff -ru gcc-5.1.0.orig/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h gcc-5.1.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h
--- gcc-5.1.0.orig/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h	2015-05-13 19:36:27.061421043 -0700
+++ gcc-5.3.0/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.h	2015-05-13 19:39:13.515487834 -0700
@@ -73,7 +73,6 @@
   #endif
   const unsigned struct_kernel_stat64_sz = 104;
 #elif defined(__riscv__)
-  const unsigned struct___old_kernel_stat_sz = 0;
   const unsigned struct_kernel_stat_sz = 128;
   const unsigned struct_kernel_stat64_sz = 128;
 #elif defined(__sparc__) && defined(__arch64__)
@@ -104,7 +103,7 @@
 
 #if SANITIZER_LINUX || SANITIZER_FREEBSD
 
-#if defined(__powerpc64__)
+#if defined(__powerpc64__) || defined(__riscv__)
   const unsigned struct___old_kernel_stat_sz = 0;
 #elif !defined(__sparc__)
   const unsigned struct___old_kernel_stat_sz = 32;
--- original-gcc/libstdc++-v3/configure
+++ gcc-5.3.0/libstdc++-v3/configure
@@ -16646,7 +16646,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   # Long term, -std=c++0x could be even better, could manage to explicitly
   # request C99 facilities to the underlying C headers.
   ac_save_CXXFLAGS="$CXXFLAGS"
-  CXXFLAGS="$CXXFLAGS -std=c++98"
+  CXXFLAGS="$CXXFLAGS -std=gnu++98"
   ac_save_LIBS="$LIBS"
   ac_save_gcc_no_link="$gcc_no_link"
 
@@ -17268,9 +17268,11 @@ rm -f core conftest.err conftest.$ac_obj
 $as_echo "$glibcxx_cv_c99_wchar" >&6; }
   fi
 
+  # For newlib, don't check complex since missing c99 functions, but
+  #   rest of c99 stuff is there so don't loose it
   # Option parsed, now set things appropriately.
   if test x"$glibcxx_cv_c99_math" = x"no" ||
-     test x"$glibcxx_cv_c99_complex" = x"no" ||
+     # test x"$glibcxx_cv_c99_complex" = x"no" ||
      test x"$glibcxx_cv_c99_stdio" = x"no" ||
      test x"$glibcxx_cv_c99_stdlib" = x"no" ||
      test x"$glibcxx_cv_c99_wchar" = x"no"; then
diff -urN empty/gcc/common/config/riscv/riscv-common.c gcc-5.3.0/gcc/common/config/riscv/riscv-common.c
--- empty/gcc/common/config/riscv/riscv-common.c	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/common/config/riscv/riscv-common.c	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,139 @@
+/* Common hooks for RISC-V.
+   Copyright (C) 1989-2014 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "common/common-target.h"
+#include "common/common-target-def.h"
+#include "opts.h"
+#include "flags.h"
+#include "errors.h"
+
+/* Parse a RISC-V ISA string into an option mask.  */
+
+static void
+riscv_parse_arch_string (const char *isa, int *flags)
+{
+  const char *p = isa;
+
+  if (strncmp (p, "RV32", 4) == 0)
+    *flags |= MASK_32BIT, p += 4;
+  else if (strncmp (p, "RV64", 4) == 0)
+    *flags &= ~MASK_32BIT, p += 4;
+
+  if (*p++ != 'I')
+    {
+      error ("-march=%s: ISA strings must begin with I, RV32I, or RV64I", isa);
+      return;
+    }
+
+  *flags &= ~MASK_MULDIV;
+  if (*p == 'M')
+    *flags |= MASK_MULDIV, p++;
+
+  *flags &= ~MASK_ATOMIC;
+  if (*p == 'A')
+    *flags |= MASK_ATOMIC, p++;
+
+  *flags |= MASK_SOFT_FLOAT_ABI;
+  if (*p == 'F')
+    *flags &= ~MASK_SOFT_FLOAT_ABI, p++;
+
+  if (*p == 'D')
+    {
+      p++;
+      if (!TARGET_HARD_FLOAT)
+	{
+	  error ("-march=%s: the D extension requires the F extension", isa);
+	  return;
+	}
+    }
+  else if (TARGET_HARD_FLOAT)
+    {
+      error ("-march=%s: single-precision-only is not yet supported", isa);
+      return;
+    }
+
+  *flags &= ~MASK_RVC;
+  if (*p == 'C')
+    *flags |= MASK_RVC, p++;
+
+  /* FIXME: For now we just stop parsing when faced with a
+     non-standard RISC-V ISA extension, partially becauses of a
+     problem with the naming scheme. */
+  if (*p == 'X')
+    return;
+
+  if (*p)
+    {
+      error ("-march=%s: unsupported ISA substring %s", isa, p);
+      return;
+    }
+}
+
+static int
+riscv_flags_from_arch_string (const char *isa)
+{
+  int flags = 0;
+  riscv_parse_arch_string (isa, &flags);
+  return flags;
+}
+
+/* Implement TARGET_HANDLE_OPTION.  */
+
+static bool
+riscv_handle_option (struct gcc_options *opts,
+		     struct gcc_options *opts_set ATTRIBUTE_UNUSED,
+		     const struct cl_decoded_option *decoded,
+		     location_t loc ATTRIBUTE_UNUSED)
+{
+  switch (decoded->opt_index)
+    {
+    case OPT_march_:
+      riscv_parse_arch_string (decoded->arg, &opts->x_target_flags);
+      return true;
+
+    default:
+      return true;
+    }
+}
+
+/* Implement TARGET_OPTION_OPTIMIZATION_TABLE.  */
+static const struct default_options riscv_option_optimization_table[] =
+  {
+    { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
+    { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
+    { OPT_LEVELS_NONE, 0, NULL, 0 }
+  };
+
+#undef TARGET_OPTION_OPTIMIZATION_TABLE
+#define TARGET_OPTION_OPTIMIZATION_TABLE riscv_option_optimization_table
+
+#undef TARGET_DEFAULT_TARGET_FLAGS
+#define TARGET_DEFAULT_TARGET_FLAGS				\
+  (TARGET_DEFAULT						\
+   | riscv_flags_from_arch_string (RISCV_ARCH_STRING_DEFAULT)	\
+   | (TARGET_64BIT_DEFAULT ? 0 : MASK_32BIT))
+
+#undef TARGET_HANDLE_OPTION
+#define TARGET_HANDLE_OPTION riscv_handle_option
+
+struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER;
diff -urN empty/gcc/config/riscv/constraints.md gcc-5.3.0/gcc/config/riscv/constraints.md
--- empty/gcc/config/riscv/constraints.md	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/constraints.md	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,93 @@
+;; Constraint definitions for RISC-V target.
+;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
+;; Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+;; Based on MIPS target for GNU compiler.
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+;; Register constraints
+
+(define_register_constraint "f" "TARGET_HARD_FLOAT ? FP_REGS : NO_REGS"
+  "A floating-point register (if available).")
+
+(define_register_constraint "b" "ALL_REGS"
+  "@internal")
+
+(define_register_constraint "j" "T_REGS"
+  "@internal")
+
+(define_register_constraint "l" "JALR_REGS"
+  "@internal")
+
+;; Integer constraints
+
+(define_constraint "Z"
+  "@internal"
+  (and (match_code "const_int")
+       (match_test "1")))
+
+(define_constraint "I"
+  "An I-type 12-bit signed immediate."
+  (and (match_code "const_int")
+       (match_test "SMALL_OPERAND (ival)")))
+
+(define_constraint "J"
+  "Integer zero."
+  (and (match_code "const_int")
+       (match_test "ival == 0")))
+
+;; Floating-point constraints
+
+(define_constraint "G"
+  "Floating-point zero."
+  (and (match_code "const_double")
+       (match_test "op == CONST0_RTX (mode)")))
+
+;; General constraints
+
+(define_constraint "Q"
+  "@internal"
+  (match_operand 0 "const_arith_operand"))
+
+(define_memory_constraint "A"
+  "An address that is held in a general-purpose register."
+  (and (match_code "mem")
+       (match_test "GET_CODE(XEXP(op,0)) == REG")))
+
+(define_constraint "S"
+  "@internal
+   A constant call address."
+  (and (match_operand 0 "call_insn_operand")
+       (match_test "CONSTANT_P (op)")))
+
+(define_constraint "T"
+  "@internal
+   A constant @code{move_operand}."
+  (and (match_operand 0 "move_operand")
+       (match_test "CONSTANT_P (op)")))
+
+(define_memory_constraint "W"
+  "@internal
+   A memory address based on a member of @code{BASE_REG_CLASS}."
+  (and (match_code "mem")
+       (match_operand 0 "memory_operand")))
+
+(define_constraint "YG"
+  "@internal
+   A vector zero."
+  (and (match_code "const_vector")
+       (match_test "op == CONST0_RTX (mode)")))
diff -urN empty/gcc/config/riscv/default-32.h gcc-5.3.0/gcc/config/riscv/default-32.h
--- empty/gcc/config/riscv/default-32.h	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/default-32.h	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,22 @@
+/* Definitions of target machine for GCC, for RISC-V,
+   defaulting to 32-bit code generation.
+
+   Copyright (C) 1999-2014 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#define TARGET_64BIT_DEFAULT 0
diff -urN empty/gcc/config/riscv/elf.h gcc-5.3.0/gcc/config/riscv/elf.h
--- empty/gcc/config/riscv/elf.h	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/elf.h	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,31 @@
+/* Target macros for riscv*-elf targets.
+   Copyright (C) 1994, 1997, 1999, 2000, 2002, 2003, 2004, 2007, 2010
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Leave the linker script to choose the appropriate libraries.  */
+#undef  LIB_SPEC
+#define LIB_SPEC ""
+
+#undef  STARTFILE_SPEC
+#define STARTFILE_SPEC "crt0%O%s crtbegin%O%s"
+
+#undef  ENDFILE_SPEC
+#define ENDFILE_SPEC "crtend%O%s"
+
+#define NO_IMPLICIT_EXTERN_C 1
diff -urN empty/gcc/config/riscv/generic.md gcc-5.3.0/gcc/config/riscv/generic.md
--- empty/gcc/config/riscv/generic.md	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/generic.md	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,78 @@
+;; Generic DFA-based pipeline description for RISC-V targets.
+;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
+;; Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+;; Based on MIPS target for GNU compiler.
+
+;; This file is part of GCC.
+
+;; GCC is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published
+;; by the Free Software Foundation; either version 3, or (at your
+;; option) any later version.
+
+;; GCC is distributed in the hope that it will be useful, but WITHOUT
+;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+;; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+;; License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+
+(define_automaton "pipe0")
+(define_cpu_unit "alu" "pipe0")
+(define_cpu_unit "imuldiv" "pipe0")
+(define_cpu_unit "fdivsqrt" "pipe0")
+
+(define_insn_reservation "generic_alu" 1
+  (eq_attr "type" "unknown,const,arith,shift,slt,multi,nop,logical,move")
+  "alu")
+
+(define_insn_reservation "generic_load" 3
+  (eq_attr "type" "load,fpload")
+  "alu")
+
+(define_insn_reservation "generic_store" 1
+  (eq_attr "type" "store,fpstore")
+  "alu")
+
+(define_insn_reservation "generic_xfer" 3
+  (eq_attr "type" "mfc,mtc,fcvt,fmove,fcmp")
+  "alu")
+
+(define_insn_reservation "generic_branch" 1
+  (eq_attr "type" "branch,jump,call")
+  "alu")
+
+(define_insn_reservation "generic_imul" 10
+  (eq_attr "type" "imul")
+  "imuldiv*10")
+
+(define_insn_reservation "generic_idivsi" 34
+  (and (eq_attr "type" "idiv")
+       (eq_attr "mode" "SI"))
+  "imuldiv*34")
+
+(define_insn_reservation "generic_idivdi" 66
+  (and (eq_attr "type" "idiv")
+       (eq_attr "mode" "DI"))
+  "imuldiv*66")
+
+(define_insn_reservation "generic_fmul_single" 5
+  (and (eq_attr "type" "fadd,fmul,fmadd")
+       (eq_attr "mode" "SF"))
+  "alu")
+
+(define_insn_reservation "generic_fmul_double" 7
+  (and (eq_attr "type" "fadd,fmul,fmadd")
+       (eq_attr "mode" "DF"))
+  "alu")
+
+(define_insn_reservation "generic_fdiv" 20
+  (eq_attr "type" "fdiv")
+  "fdivsqrt*20")
+
+(define_insn_reservation "generic_fsqrt" 25
+  (eq_attr "type" "fsqrt")
+  "fdivsqrt*25")
diff -urN empty/gcc/config/riscv/linux64.h gcc-5.3.0/gcc/config/riscv/linux64.h
--- empty/gcc/config/riscv/linux64.h	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/linux64.h	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,43 @@
+/* Definitions for 64-bit RISC-V GNU/Linux systems with ELF format.
+   Copyright 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010, 2011
+   Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Force the default ABI flags onto the command line
+   in order to make the other specs easier to write.  */
+#undef LIB_SPEC
+#define LIB_SPEC "\
+%{pthread:-lpthread} \
+%{shared:-lc} \
+%{!shared: \
+  %{profile:-lc_p} %{!profile:-lc}}"
+
+#define GLIBC_DYNAMIC_LINKER32 "/lib32/ld.so.1"
+#define GLIBC_DYNAMIC_LINKER64 "/lib/ld.so.1"
+
+#undef LINK_SPEC
+#define LINK_SPEC "\
+%{shared} \
+  %{!shared: \
+    %{!static: \
+      %{rdynamic:-export-dynamic} \
+      %{" OPT_ARCH64 ": -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "} \
+      %{" OPT_ARCH32 ": -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}} \
+    %{static:-static}} \
+%{" OPT_ARCH64 ":-melf64lriscv} \
+%{" OPT_ARCH32 ":-melf32lriscv}"
diff -urN empty/gcc/config/riscv/linux.h gcc-5.3.0/gcc/config/riscv/linux.h
--- empty/gcc/config/riscv/linux.h	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/linux.h	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,60 @@
+/* Definitions for RISC-V GNU/Linux systems with ELF format.
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+   2007, 2008, 2010, 2011 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#undef WCHAR_TYPE
+#define WCHAR_TYPE "int"
+
+#undef WCHAR_TYPE_SIZE
+#define WCHAR_TYPE_SIZE 32
+
+#define TARGET_OS_CPP_BUILTINS()				\
+  do {								\
+    GNU_USER_TARGET_OS_CPP_BUILTINS();				\
+    /* The GNU C++ standard library requires this.  */		\
+    if (c_dialect_cxx ())					\
+      builtin_define ("_GNU_SOURCE");				\
+  } while (0)
+
+#undef SUBTARGET_CPP_SPEC
+#define SUBTARGET_CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{pthread:-D_REENTRANT}"
+
+#define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
+
+/* Borrowed from sparc/linux.h */
+#undef LINK_SPEC
+#define LINK_SPEC \
+  "%{shared:-shared} \
+  %{!shared: \
+    %{!static: \
+      %{rdynamic:-export-dynamic} \
+      -dynamic-linker " GNU_USER_DYNAMIC_LINKER "} \
+      %{static:-static}}"
+
+#undef LIB_SPEC
+#define LIB_SPEC "\
+%{pthread:-lpthread} \
+%{shared:-lc} \
+%{!shared: \
+  %{profile:-lc_p} %{!profile:-lc}}"
+
+/* Similar to standard Linux, but adding -ffast-math support.  */
+#undef  ENDFILE_SPEC
+#define ENDFILE_SPEC \
+   "%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
diff -urN empty/gcc/config/riscv/peephole.md gcc-5.3.0/gcc/config/riscv/peephole.md
--- empty/gcc/config/riscv/peephole.md	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/peephole.md	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,121 @@
+;;........................
+;; DI -> SI optimizations
+;;........................
+
+;; Simplify (int)(a + 1), etc.
+(define_peephole2
+  [(set (match_operand:DI 0 "register_operand")
+	(match_operator:DI 4 "modular_operator"
+	  [(match_operand:DI 1 "register_operand")
+	   (match_operand:DI 2 "arith_operand")]))
+   (set (match_operand:SI 3 "register_operand")
+	(truncate:SI (match_dup 0)))]
+  "TARGET_64BIT && (REGNO (operands[0]) == REGNO (operands[3]) || peep2_reg_dead_p (2, operands[0]))
+   && (GET_CODE (operands[4]) != ASHIFT || (CONST_INT_P (operands[2]) && INTVAL (operands[2]) < 32))"
+  [(set (match_dup 3)
+	  (truncate:SI
+	     (match_op_dup:DI 4 
+	       [(match_operand:DI 1 "register_operand")
+		(match_operand:DI 2 "arith_operand")])))])
+
+;; Simplify (int)a + 1, etc.
+(define_peephole2
+  [(set (match_operand:SI 0 "register_operand")
+	(truncate:SI (match_operand:DI 1 "register_operand")))
+   (set (match_operand:SI 3 "register_operand")
+	(match_operator:SI 4 "modular_operator"
+	  [(match_dup 0)
+	   (match_operand:SI 2 "arith_operand")]))]
+  "TARGET_64BIT && (REGNO (operands[0]) == REGNO (operands[3]) || peep2_reg_dead_p (2, operands[0]))"
+  [(set (match_dup 3)
+	(match_op_dup:SI 4 [(match_dup 1) (match_dup 2)]))])
+
+;; Simplify -(int)a, etc.
+(define_peephole2
+  [(set (match_operand:SI 0 "register_operand")
+	(truncate:SI (match_operand:DI 2 "register_operand")))
+   (set (match_operand:SI 3 "register_operand")
+	(match_operator:SI 4 "modular_operator"
+	  [(match_operand:SI 1 "reg_or_0_operand")
+	   (match_dup 0)]))]
+  "TARGET_64BIT && (REGNO (operands[0]) == REGNO (operands[3]) || peep2_reg_dead_p (2, operands[0]))"
+  [(set (match_dup 3)
+	(match_op_dup:SI 4 [(match_dup 1) (match_dup 2)]))])
+
+;; Simplify (unsigned long)(unsigned int)a << const
+(define_peephole2
+  [(set (match_operand:DI 0 "register_operand")
+	(ashift:DI (match_operand:DI 1 "register_operand")
+		   (match_operand 2 "const_int_operand")))
+   (set (match_operand:DI 3 "register_operand")
+	(lshiftrt:DI (match_dup 0) (match_dup 2)))
+   (set (match_operand:DI 4 "register_operand")
+	(ashift:DI (match_dup 3) (match_operand 5 "const_int_operand")))]
+  "TARGET_64BIT
+   && INTVAL (operands[5]) < INTVAL (operands[2])
+   && (REGNO (operands[3]) == REGNO (operands[4])
+       || peep2_reg_dead_p (3, operands[3]))"
+  [(set (match_dup 0)
+	(ashift:DI (match_dup 1) (match_dup 2)))
+   (set (match_dup 4)
+	(lshiftrt:DI (match_dup 0) (match_operand 5)))]
+{
+  operands[5] = GEN_INT (INTVAL (operands[2]) - INTVAL (operands[5]));
+})
+
+;; Simplify PIC loads to static variables.
+;; These will go away once we figure out how to emit auipc discretely.
+(define_insn "*local_pic_load<mode>"
+  [(set (match_operand:ANYI 0 "register_operand" "=r")
+	(mem:ANYI (match_operand 1 "absolute_symbolic_operand" "")))]
+  "flag_pic && SYMBOL_REF_LOCAL_P (operands[1])"
+  "<load>\t%0,%1"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_load<mode>"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(mem:ANYF (match_operand 1 "absolute_symbolic_operand" "")))
+   (clobber (match_scratch:DI 2 "=&r"))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT && flag_pic && SYMBOL_REF_LOCAL_P (operands[1])"
+  "<load>\t%0,%1,%2"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_load<mode>"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(mem:ANYF (match_operand 1 "absolute_symbolic_operand" "")))
+   (clobber (match_scratch:SI 2 "=&r"))]
+  "TARGET_HARD_FLOAT && !TARGET_64BIT && flag_pic && SYMBOL_REF_LOCAL_P (operands[1])"
+  "<load>\t%0,%1,%2"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_loadu<mode>"
+  [(set (match_operand:SUPERQI 0 "register_operand" "=r")
+	(zero_extend:SUPERQI (mem:SUBDI (match_operand 1 "absolute_symbolic_operand" ""))))]
+  "flag_pic && SYMBOL_REF_LOCAL_P (operands[1])"
+  "<load>u\t%0,%1"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_storedi<mode>"
+  [(set (mem:ANYI (match_operand 0 "absolute_symbolic_operand" ""))
+	(match_operand:ANYI 1 "reg_or_0_operand" "rJ"))
+   (clobber (match_scratch:DI 2 "=&r"))]
+  "TARGET_64BIT && (flag_pic && SYMBOL_REF_LOCAL_P (operands[0]))"
+  "<store>\t%z1,%0,%2"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_storesi<mode>"
+  [(set (mem:ANYI (match_operand 0 "absolute_symbolic_operand" ""))
+	(match_operand:ANYI 1 "reg_or_0_operand" "rJ"))
+   (clobber (match_scratch:SI 2 "=&r"))]
+  "!TARGET_64BIT && (flag_pic && SYMBOL_REF_LOCAL_P (operands[0]))"
+  "<store>\t%z1,%0,%2"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_storedi<mode>"
+  [(set (mem:ANYF (match_operand 0 "absolute_symbolic_operand" ""))
+	(match_operand:ANYF 1 "register_operand" "f"))
+   (clobber (match_scratch:DI 2 "=&r"))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT && (flag_pic && SYMBOL_REF_LOCAL_P (operands[0]))"
+  "<store>\t%1,%0,%2"
+  [(set (attr "length") (const_int 8))])
+(define_insn "*local_pic_storesi<mode>"
+  [(set (mem:ANYF (match_operand 0 "absolute_symbolic_operand" ""))
+	(match_operand:ANYF 1 "register_operand" "f"))
+   (clobber (match_scratch:SI 2 "=&r"))]
+  "TARGET_HARD_FLOAT && !TARGET_64BIT && (flag_pic && SYMBOL_REF_LOCAL_P (operands[0]))"
+  "<store>\t%1,%0,%2"
+  [(set (attr "length") (const_int 8))])
diff -urN empty/gcc/config/riscv/predicates.md gcc-5.3.0/gcc/config/riscv/predicates.md
--- empty/gcc/config/riscv/predicates.md	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/predicates.md	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,184 @@
+;; Predicate description for RISC-V target.
+;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
+;; Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+;; Based on MIPS target for GNU compiler.
+;;
+;; This file is part of GCC.
+;;
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_predicate "const_arith_operand"
+  (and (match_code "const_int")
+       (match_test "SMALL_OPERAND (INTVAL (op))")))
+
+(define_predicate "arith_operand"
+  (ior (match_operand 0 "const_arith_operand")
+       (match_operand 0 "register_operand")))
+
+(define_predicate "sle_operand"
+  (and (match_code "const_int")
+       (match_test "SMALL_OPERAND (INTVAL (op) + 1)")))
+
+(define_predicate "sleu_operand"
+  (and (match_operand 0 "sle_operand")
+       (match_test "INTVAL (op) + 1 != 0")))
+
+(define_predicate "const_0_operand"
+  (and (match_code "const_int,const_double,const_vector")
+       (match_test "op == CONST0_RTX (GET_MODE (op))")))
+
+(define_predicate "reg_or_0_operand"
+  (ior (match_operand 0 "const_0_operand")
+       (match_operand 0 "register_operand")))
+
+(define_predicate "const_1_operand"
+  (and (match_code "const_int,const_double,const_vector")
+       (match_test "op == CONST1_RTX (GET_MODE (op))")))
+
+(define_predicate "reg_or_1_operand"
+  (ior (match_operand 0 "const_1_operand")
+       (match_operand 0 "register_operand")))
+
+;; Only use branch-on-bit sequences when the mask is not an ANDI immediate.
+(define_predicate "branch_on_bit_operand"
+  (and (match_code "const_int")
+       (match_test "INTVAL (op) >= IMM_BITS - 1")))
+
+;; This is used for indexing into vectors, and hence only accepts const_int.
+(define_predicate "const_0_or_1_operand"
+  (and (match_code "const_int")
+       (ior (match_test "op == CONST0_RTX (GET_MODE (op))")
+	    (match_test "op == CONST1_RTX (GET_MODE (op))"))))
+
+(define_special_predicate "pc_or_label_operand"
+  (match_code "pc,label_ref"))
+
+;; A legitimate CONST_INT operand that takes more than one instruction
+;; to load.
+(define_predicate "splittable_const_int_operand"
+  (match_code "const_int")
+{
+  /* Don't handle multi-word moves this way; we don't want to introduce
+     the individual word-mode moves until after reload.  */
+  if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
+    return false;
+
+  /* Otherwise check whether the constant can be loaded in a single
+     instruction.  */
+  return !LUI_OPERAND (INTVAL (op)) && !SMALL_OPERAND (INTVAL (op));
+})
+
+(define_predicate "move_operand"
+  (match_operand 0 "general_operand")
+{
+  enum riscv_symbol_type symbol_type;
+
+  /* The thinking here is as follows:
+
+     (1) The move expanders should split complex load sequences into
+	 individual instructions.  Those individual instructions can
+	 then be optimized by all rtl passes.
+
+     (2) The target of pre-reload load sequences should not be used
+	 to store temporary results.  If the target register is only
+	 assigned one value, reload can rematerialize that value
+	 on demand, rather than spill it to the stack.
+
+     (3) If we allowed pre-reload passes like combine and cse to recreate
+	 complex load sequences, we would want to be able to split the
+	 sequences before reload as well, so that the pre-reload scheduler
+	 can see the individual instructions.  This falls foul of (2);
+	 the splitter would be forced to reuse the target register for
+	 intermediate results.
+
+     (4) We want to define complex load splitters for combine.  These
+	 splitters can request a temporary scratch register, which avoids
+	 the problem in (2).  They allow things like:
+
+	      (set (reg T1) (high SYM))
+	      (set (reg T2) (low (reg T1) SYM))
+	      (set (reg X) (plus (reg T2) (const_int OFFSET)))
+
+	 to be combined into:
+
+	      (set (reg T3) (high SYM+OFFSET))
+	      (set (reg X) (lo_sum (reg T3) SYM+OFFSET))
+
+	 if T2 is only used this once.  */
+  switch (GET_CODE (op))
+    {
+    case CONST_INT:
+      return !splittable_const_int_operand (op, mode);
+
+    case CONST:
+    case SYMBOL_REF:
+    case LABEL_REF:
+      return (riscv_symbolic_constant_p (op, &symbol_type)
+	      && !riscv_hi_relocs[symbol_type]);
+
+    case HIGH:
+      op = XEXP (op, 0);
+      return riscv_symbolic_constant_p (op, &symbol_type);
+
+    default:
+      return true;
+    }
+})
+
+(define_predicate "consttable_operand"
+  (match_test "CONSTANT_P (op)"))
+
+(define_predicate "symbolic_operand"
+  (match_code "const,symbol_ref,label_ref")
+{
+  enum riscv_symbol_type type;
+  return riscv_symbolic_constant_p (op, &type);
+})
+
+(define_predicate "absolute_symbolic_operand"
+  (match_code "const,symbol_ref,label_ref")
+{
+  enum riscv_symbol_type type;
+  return (riscv_symbolic_constant_p (op, &type)
+	  && type == SYMBOL_ABSOLUTE);
+})
+
+(define_predicate "plt_symbolic_operand"
+  (match_code "const,symbol_ref,label_ref")
+{
+  enum riscv_symbol_type type;
+  return (riscv_symbolic_constant_p (op, &type)
+	  && type == SYMBOL_GOT_DISP && !SYMBOL_REF_WEAK (op) && TARGET_PLT);
+})
+
+(define_predicate "call_insn_operand"
+  (ior (match_operand 0 "absolute_symbolic_operand")
+       (match_operand 0 "plt_symbolic_operand")
+       (match_operand 0 "register_operand")))
+
+(define_predicate "symbol_ref_operand"
+  (match_code "symbol_ref"))
+
+(define_predicate "modular_operator"
+  (match_code "plus,minus,mult,ashift"))
+
+(define_predicate "equality_operator"
+  (match_code "eq,ne"))
+
+(define_predicate "order_operator"
+  (match_code "eq,ne,lt,ltu,le,leu,ge,geu,gt,gtu"))
+
+(define_predicate "fp_order_operator"
+  (match_code "eq,ne,lt,le,gt,ge"))
diff -urN empty/gcc/config/riscv/riscv.c gcc-5.3.0/gcc/config/riscv/riscv.c
--- empty/gcc/config/riscv/riscv.c	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv.c	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,4311 @@
+/* Subroutines used for code generation for RISC-V.
+   Copyright (C) 2011-2014 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+   Based on MIPS target for GNU compiler.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "rtl.h"
+#include "regs.h"
+#include "hard-reg-set.h"
+#include "insn-config.h"
+#include "conditions.h"
+#include "insn-attr.h"
+#include "recog.h"
+#include "output.h"
+#include "hash-set.h"
+#include "machmode.h"
+#include "vec.h"
+#include "double-int.h"
+#include "input.h"
+#include "alias.h"
+#include "symtab.h"
+#include "wide-int.h"
+#include "inchash.h"
+#include "tree.h"
+#include "fold-const.h"
+#include "varasm.h"
+#include "stringpool.h"
+#include "stor-layout.h"
+#include "calls.h"
+#include "function.h"
+#include "hashtab.h"
+#include "flags.h"
+#include "statistics.h"
+#include "real.h"
+#include "fixed-value.h"
+#include "expmed.h"
+#include "dojump.h"
+#include "explow.h"
+#include "emit-rtl.h"
+#include "stmt.h"
+#include "expr.h"
+#include "insn-codes.h"
+#include "optabs.h"
+#include "libfuncs.h"
+#include "reload.h"
+#include "tm_p.h"
+#include "ggc.h"
+#include "gstab.h"
+#include "hash-table.h"
+#include "debug.h"
+#include "target.h"
+#include "target-def.h"
+#include "common/common-target.h"
+#include "langhooks.h"
+#include "dominance.h"
+#include "cfg.h"
+#include "cfgrtl.h"
+#include "cfganal.h"
+#include "lcm.h"
+#include "cfgbuild.h"
+#include "cfgcleanup.h"
+#include "predict.h"
+#include "basic-block.h"
+#include "sched-int.h"
+#include "tree-ssa-alias.h"
+#include "internal-fn.h"
+#include "gimple-fold.h"
+#include "tree-eh.h"
+#include "gimple-expr.h"
+#include "is-a.h"
+#include "gimple.h"
+#include "gimplify.h"
+#include "bitmap.h"
+#include "diagnostic.h"
+#include "target-globals.h"
+#include "opts.h"
+#include "tree-pass.h"
+#include "context.h"
+#include "hash-map.h"
+#include "plugin-api.h"
+#include "ipa-ref.h"
+#include "cgraph.h"
+#include "builtins.h"
+#include "rtl-iter.h"
+#include <stdint.h>
+
+/* True if X is an UNSPEC wrapper around a SYMBOL_REF or LABEL_REF.  */
+#define UNSPEC_ADDRESS_P(X)					\
+  (GET_CODE (X) == UNSPEC					\
+   && XINT (X, 1) >= UNSPEC_ADDRESS_FIRST			\
+   && XINT (X, 1) < UNSPEC_ADDRESS_FIRST + NUM_SYMBOL_TYPES)
+
+/* Extract the symbol or label from UNSPEC wrapper X.  */
+#define UNSPEC_ADDRESS(X) \
+  XVECEXP (X, 0, 0)
+
+/* Extract the symbol type from UNSPEC wrapper X.  */
+#define UNSPEC_ADDRESS_TYPE(X) \
+  ((enum riscv_symbol_type) (XINT (X, 1) - UNSPEC_ADDRESS_FIRST))
+
+/* The maximum distance between the top of the stack frame and the
+   value sp has when we save and restore registers.  This is set by the
+   range  of load/store offsets and must also preserve stack alignment. */
+#define RISCV_MAX_FIRST_STACK_STEP (IMM_REACH/2 - 16)
+
+/* True if INSN is a riscv.md pattern or asm statement.  */
+#define USEFUL_INSN_P(INSN)						\
+  (NONDEBUG_INSN_P (INSN)						\
+   && GET_CODE (PATTERN (INSN)) != USE					\
+   && GET_CODE (PATTERN (INSN)) != CLOBBER				\
+   && GET_CODE (PATTERN (INSN)) != ADDR_VEC				\
+   && GET_CODE (PATTERN (INSN)) != ADDR_DIFF_VEC)
+
+/* True if bit BIT is set in VALUE.  */
+#define BITSET_P(VALUE, BIT) (((VALUE) & (1 << (BIT))) != 0)
+
+/* Classifies an address.
+
+   ADDRESS_REG
+       A natural register + offset address.  The register satisfies
+       riscv_valid_base_register_p and the offset is a const_arith_operand.
+
+   ADDRESS_LO_SUM
+       A LO_SUM rtx.  The first operand is a valid base register and
+       the second operand is a symbolic address.
+
+   ADDRESS_CONST_INT
+       A signed 16-bit constant address.
+
+   ADDRESS_SYMBOLIC:
+       A constant symbolic address.  */
+enum riscv_address_type {
+  ADDRESS_REG,
+  ADDRESS_LO_SUM,
+  ADDRESS_CONST_INT,
+  ADDRESS_SYMBOLIC
+};
+
+enum riscv_code_model riscv_cmodel = TARGET_DEFAULT_CMODEL;
+
+/* Macros to create an enumeration identifier for a function prototype.  */
+#define RISCV_FTYPE_NAME1(A, B) RISCV_##A##_FTYPE_##B
+#define RISCV_FTYPE_NAME2(A, B, C) RISCV_##A##_FTYPE_##B##_##C
+#define RISCV_FTYPE_NAME3(A, B, C, D) RISCV_##A##_FTYPE_##B##_##C##_##D
+#define RISCV_FTYPE_NAME4(A, B, C, D, E) RISCV_##A##_FTYPE_##B##_##C##_##D##_##E
+
+/* Classifies the prototype of a built-in function.  */
+enum riscv_function_type {
+#define DEF_RISCV_FTYPE(NARGS, LIST) RISCV_FTYPE_NAME##NARGS LIST,
+#include "config/riscv/riscv-ftypes.def"
+#undef DEF_RISCV_FTYPE
+  RISCV_MAX_FTYPE_MAX
+};
+
+/* Specifies how a built-in function should be converted into rtl.  */
+enum riscv_builtin_type {
+  /* The function corresponds directly to an .md pattern.  The return
+     value is mapped to operand 0 and the arguments are mapped to
+     operands 1 and above.  */
+  RISCV_BUILTIN_DIRECT,
+
+  /* The function corresponds directly to an .md pattern.  There is no return
+     value and the arguments are mapped to operands 0 and above.  */
+  RISCV_BUILTIN_DIRECT_NO_TARGET
+};
+
+/* Information about a function's frame layout.  */
+struct GTY(())  riscv_frame_info {
+  /* The size of the frame in bytes.  */
+  HOST_WIDE_INT total_size;
+
+  /* Bit X is set if the function saves or restores GPR X.  */
+  unsigned int mask;
+
+  /* Likewise FPR X.  */
+  unsigned int fmask;
+
+  /* How much the GPR save/restore routines adjust sp (or 0 if unused).  */
+  unsigned save_libcall_adjustment;
+
+  /* Offsets of fixed-point and floating-point save areas from frame bottom */
+  HOST_WIDE_INT gp_sp_offset;
+  HOST_WIDE_INT fp_sp_offset;
+
+  /* Offset of virtual frame pointer from stack pointer/frame bottom */
+  HOST_WIDE_INT frame_pointer_offset;
+
+  /* Offset of hard frame pointer from stack pointer/frame bottom */
+  HOST_WIDE_INT hard_frame_pointer_offset;
+
+  /* The offset of arg_pointer_rtx from the bottom of the frame.  */
+  HOST_WIDE_INT arg_pointer_offset;
+};
+
+struct GTY(())  machine_function {
+  /* The number of extra stack bytes taken up by register varargs.
+     This area is allocated by the callee at the very top of the frame.  */
+  int varargs_size;
+
+  /* Cached return value of leaf_function_p.  <0 if false, >0 if true.  */
+  int is_leaf;
+
+  /* The current frame information, calculated by riscv_compute_frame_info.  */
+  struct riscv_frame_info frame;
+};
+
+/* Information about a single argument.  */
+struct riscv_arg_info {
+  /* True if the argument is passed in a floating-point register, or
+     would have been if we hadn't run out of registers.  */
+  bool fpr_p;
+
+  /* The number of words passed in registers, rounded up.  */
+  unsigned int reg_words;
+
+  /* For EABI, the offset of the first register from GP_ARG_FIRST or
+     FP_ARG_FIRST.  For other ABIs, the offset of the first register from
+     the start of the ABI's argument structure (see the CUMULATIVE_ARGS
+     comment for details).
+
+     The value is MAX_ARGS_IN_REGISTERS if the argument is passed entirely
+     on the stack.  */
+  unsigned int reg_offset;
+
+  /* The number of words that must be passed on the stack, rounded up.  */
+  unsigned int stack_words;
+
+  /* The offset from the start of the stack overflow area of the argument's
+     first stack word.  Only meaningful when STACK_WORDS is nonzero.  */
+  unsigned int stack_offset;
+};
+
+/* Information about an address described by riscv_address_type.
+
+   ADDRESS_CONST_INT
+       No fields are used.
+
+   ADDRESS_REG
+       REG is the base register and OFFSET is the constant offset.
+
+   ADDRESS_LO_SUM
+       REG and OFFSET are the operands to the LO_SUM and SYMBOL_TYPE
+       is the type of symbol it references.
+
+   ADDRESS_SYMBOLIC
+       SYMBOL_TYPE is the type of symbol that the address references.  */
+struct riscv_address_info {
+  enum riscv_address_type type;
+  rtx reg;
+  rtx offset;
+  enum riscv_symbol_type symbol_type;
+};
+
+/* One stage in a constant building sequence.  These sequences have
+   the form:
+
+	A = VALUE[0]
+	A = A CODE[1] VALUE[1]
+	A = A CODE[2] VALUE[2]
+	...
+
+   where A is an accumulator, each CODE[i] is a binary rtl operation
+   and each VALUE[i] is a constant integer.  CODE[0] is undefined.  */
+struct riscv_integer_op {
+  enum rtx_code code;
+  unsigned HOST_WIDE_INT value;
+};
+
+/* The largest number of operations needed to load an integer constant.
+   The worst case is LUI, ADDI, SLLI, ADDI, SLLI, ADDI, SLLI, ADDI,
+   but we may attempt and reject even worse sequences.  */
+#define RISCV_MAX_INTEGER_OPS 32
+
+/* Costs of various operations on the different architectures.  */
+
+struct riscv_tune_info
+{
+  unsigned short fp_add[2];
+  unsigned short fp_mul[2];
+  unsigned short fp_div[2];
+  unsigned short int_mul[2];
+  unsigned short int_div[2];
+  unsigned short issue_rate;
+  unsigned short branch_cost;
+  unsigned short memory_cost;
+};
+
+/* Information about one CPU we know about.  */
+struct riscv_cpu_info {
+  /* This CPU's canonical name.  */
+  const char *name;
+
+  /* The RISC-V ISA and extensions supported by this CPU.  */
+  const char *isa;
+
+  /* Tuning parameters for this CPU.  */
+  const struct riscv_tune_info *tune_info;
+};
+
+/* Global variables for machine-dependent things.  */
+
+/* Which tuning parameters to use.  */
+static const struct riscv_tune_info *tune_info;
+
+/* Index [M][R] is true if register R is allowed to hold a value of mode M.  */
+bool riscv_hard_regno_mode_ok[(int) MAX_MACHINE_MODE][FIRST_PSEUDO_REGISTER];
+
+/* riscv_lo_relocs[X] is the relocation to use when a symbol of type X
+   appears in a LO_SUM.  It can be null if such LO_SUMs aren't valid or
+   if they are matched by a special .md file pattern.  */
+const char *riscv_lo_relocs[NUM_SYMBOL_TYPES];
+
+/* Likewise for HIGHs.  */
+const char *riscv_hi_relocs[NUM_SYMBOL_TYPES];
+
+/* Index R is the smallest register class that contains register R.  */
+const enum reg_class riscv_regno_to_class[FIRST_PSEUDO_REGISTER] = {
+  GR_REGS,	GR_REGS,	GR_REGS,	GR_REGS,
+  GR_REGS,	T_REGS,		T_REGS,		T_REGS,
+  GR_REGS,	GR_REGS,	GR_REGS,	GR_REGS,
+  GR_REGS,	GR_REGS,	GR_REGS,	GR_REGS,
+  GR_REGS,	GR_REGS, 	GR_REGS,	GR_REGS,
+  GR_REGS,	GR_REGS,	GR_REGS,	GR_REGS,
+  GR_REGS,	GR_REGS,	GR_REGS,	GR_REGS,
+  T_REGS,	T_REGS,		T_REGS,		T_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FP_REGS,	FP_REGS,	FP_REGS,	FP_REGS,
+  FRAME_REGS,	FRAME_REGS,
+};
+
+/* Costs to use when optimizing for size.  */
+static const struct riscv_tune_info rocket_tune_info = {
+  {COSTS_N_INSNS (4), COSTS_N_INSNS (5)},	/* fp_add */
+  {COSTS_N_INSNS (4), COSTS_N_INSNS (5)},	/* fp_mul */
+  {COSTS_N_INSNS (20), COSTS_N_INSNS (20)},	/* fp_div */
+  {COSTS_N_INSNS (4), COSTS_N_INSNS (4)},	/* int_mul */
+  {COSTS_N_INSNS (6), COSTS_N_INSNS (6)},	/* int_div */
+  1,						/* issue_rate */
+  3,						/* branch_cost */
+  5						/* memory_cost */
+};
+
+/* Costs to use when optimizing for size.  */
+static const struct riscv_tune_info optimize_size_tune_info = {
+  {COSTS_N_INSNS (1), COSTS_N_INSNS (1)},	/* fp_add */
+  {COSTS_N_INSNS (1), COSTS_N_INSNS (1)},	/* fp_mul */
+  {COSTS_N_INSNS (1), COSTS_N_INSNS (1)},	/* fp_div */
+  {COSTS_N_INSNS (1), COSTS_N_INSNS (1)},	/* int_mul */
+  {COSTS_N_INSNS (1), COSTS_N_INSNS (1)},	/* int_div */
+  1,						/* issue_rate */
+  1,						/* branch_cost */
+  1						/* memory_cost */
+};
+
+/* A table describing all the processors GCC knows about.  */
+static const struct riscv_cpu_info riscv_cpu_info_table[] = {
+  /* Entries for generic ISAs.  */
+  { "rocket", "IMAFD", &rocket_tune_info },
+};
+
+/* Return the riscv_cpu_info entry for the given name string.  */
+
+static const struct riscv_cpu_info *
+riscv_parse_cpu (const char *cpu_string)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARRAY_SIZE (riscv_cpu_info_table); i++)
+    if (strcmp (riscv_cpu_info_table[i].name, cpu_string) == 0)
+      return riscv_cpu_info_table + i;
+
+  error ("unknown cpu `%s'", cpu_string);
+  return riscv_cpu_info_table;
+}
+
+/* Fill CODES with a sequence of rtl operations to load VALUE.
+   Return the number of operations needed.  */
+
+static int
+riscv_build_integer_1 (struct riscv_integer_op *codes, HOST_WIDE_INT value,
+		       enum machine_mode mode)
+{
+  HOST_WIDE_INT low_part = CONST_LOW_PART (value);
+  int cost = INT_MAX, alt_cost;
+  struct riscv_integer_op alt_codes[RISCV_MAX_INTEGER_OPS];
+
+  if (SMALL_OPERAND (value) || LUI_OPERAND (value))
+    {
+      /* Simply ADDI or LUI */
+      codes[0].code = UNKNOWN;
+      codes[0].value = value;
+      return 1;
+    }
+
+  /* End with ADDI */
+  if (low_part != 0
+      && !(mode == HImode && (int16_t)(value - low_part) != (value - low_part)))
+    {
+      cost = 1 + riscv_build_integer_1 (codes, value - low_part, mode);
+      codes[cost-1].code = PLUS;
+      codes[cost-1].value = low_part;
+    }
+
+  /* End with XORI */
+  if (cost > 2 && (low_part < 0 || mode == HImode))
+    {
+      alt_cost = 1 + riscv_build_integer_1 (alt_codes, value ^ low_part, mode);
+      alt_codes[alt_cost-1].code = XOR;
+      alt_codes[alt_cost-1].value = low_part;
+      if (alt_cost < cost)
+	cost = alt_cost, memcpy (codes, alt_codes, sizeof(alt_codes));
+    }
+
+  /* Eliminate trailing zeros and end with SLLI */
+  if (cost > 2 && (value & 1) == 0)
+    {
+      int shift = 0;
+      while ((value & 1) == 0)
+	shift++, value >>= 1;
+      alt_cost = 1 + riscv_build_integer_1 (alt_codes, value, mode);
+      alt_codes[alt_cost-1].code = ASHIFT;
+      alt_codes[alt_cost-1].value = shift;
+      if (alt_cost < cost)
+	cost = alt_cost, memcpy (codes, alt_codes, sizeof(alt_codes));
+    }
+
+  gcc_assert (cost <= RISCV_MAX_INTEGER_OPS);
+  return cost;
+}
+
+static int
+riscv_build_integer (struct riscv_integer_op *codes, HOST_WIDE_INT value,
+		     enum machine_mode mode)
+{
+  int cost = riscv_build_integer_1 (codes, value, mode);
+
+  /* Eliminate leading zeros and end with SRLI */
+  if (value > 0 && cost > 2)
+    {
+      struct riscv_integer_op alt_codes[RISCV_MAX_INTEGER_OPS];
+      int alt_cost, shift = 0;
+      HOST_WIDE_INT shifted_val;
+
+      /* Try filling trailing bits with 1s */
+      while ((value << shift) >= 0)
+	shift++;
+      shifted_val = (value << shift) | ((((HOST_WIDE_INT) 1) << shift) - 1);
+      alt_cost = 1 + riscv_build_integer_1 (alt_codes, shifted_val, mode);
+      alt_codes[alt_cost-1].code = LSHIFTRT;
+      alt_codes[alt_cost-1].value = shift;
+      if (alt_cost < cost)
+	cost = alt_cost, memcpy (codes, alt_codes, sizeof (alt_codes));
+
+      /* Try filling trailing bits with 0s */
+      shifted_val = value << shift;
+      alt_cost = 1 + riscv_build_integer_1 (alt_codes, shifted_val, mode);
+      alt_codes[alt_cost-1].code = LSHIFTRT;
+      alt_codes[alt_cost-1].value = shift;
+      if (alt_cost < cost)
+	cost = alt_cost, memcpy (codes, alt_codes, sizeof (alt_codes));
+    }
+
+  return cost;
+}
+
+static int
+riscv_split_integer_cost (HOST_WIDE_INT val)
+{
+  int cost;
+  int32_t loval = val, hival = (val - (int32_t)val) >> 32;
+  struct riscv_integer_op codes[RISCV_MAX_INTEGER_OPS];
+
+  cost = 2 + riscv_build_integer (codes, loval, VOIDmode);
+  if (loval != hival)
+    cost += riscv_build_integer (codes, hival, VOIDmode);
+
+  return cost;
+}
+
+static int
+riscv_integer_cost (HOST_WIDE_INT val)
+{
+  struct riscv_integer_op codes[RISCV_MAX_INTEGER_OPS];
+  return MIN (riscv_build_integer (codes, val, VOIDmode),
+	      riscv_split_integer_cost (val));
+}
+
+/* Try to split a 64b integer into 32b parts, then reassemble. */
+
+static rtx
+riscv_split_integer (HOST_WIDE_INT val, enum machine_mode mode)
+{
+  int32_t loval = val, hival = (val - (int32_t)val) >> 32;
+  rtx hi = gen_reg_rtx (mode), lo = gen_reg_rtx (mode);
+
+  riscv_move_integer (hi, hi, hival);
+  riscv_move_integer (lo, lo, loval);
+
+  hi = gen_rtx_fmt_ee (ASHIFT, mode, hi, GEN_INT (32));
+  hi = force_reg (mode, hi);
+
+  return gen_rtx_fmt_ee (PLUS, mode, hi, lo);
+}
+
+/* Return true if X is a thread-local symbol.  */
+
+static bool
+riscv_tls_symbol_p (const_rtx x)
+{
+  return GET_CODE (x) == SYMBOL_REF && SYMBOL_REF_TLS_MODEL (x) != 0;
+}
+
+static bool
+riscv_symbol_binds_local_p (const_rtx x)
+{
+  return (SYMBOL_REF_DECL (x)
+	  ? targetm.binds_local_p (SYMBOL_REF_DECL (x))
+	  : SYMBOL_REF_LOCAL_P (x));
+}
+
+/* Return the method that should be used to access SYMBOL_REF or
+   LABEL_REF X in context CONTEXT.  */
+
+static enum riscv_symbol_type
+riscv_classify_symbol (const_rtx x)
+{
+  if (riscv_tls_symbol_p (x))
+    return SYMBOL_TLS;
+
+  if (GET_CODE (x) == LABEL_REF)
+    {
+      if (LABEL_REF_NONLOCAL_P (x))
+	return SYMBOL_GOT_DISP;
+      return SYMBOL_ABSOLUTE;
+    }
+
+  gcc_assert (GET_CODE (x) == SYMBOL_REF);
+
+  if (flag_pic && !riscv_symbol_binds_local_p (x))
+    return SYMBOL_GOT_DISP;
+
+  return SYMBOL_ABSOLUTE;
+}
+
+/* Classify the base of symbolic expression X, given that X appears in
+   context CONTEXT.  */
+
+static enum riscv_symbol_type
+riscv_classify_symbolic_expression (rtx x)
+{
+  rtx offset;
+
+  split_const (x, &x, &offset);
+  if (UNSPEC_ADDRESS_P (x))
+    return UNSPEC_ADDRESS_TYPE (x);
+
+  return riscv_classify_symbol (x);
+}
+
+/* Return true if X is a symbolic constant that can be used in context
+   CONTEXT.  If it is, store the type of the symbol in *SYMBOL_TYPE.  */
+
+bool
+riscv_symbolic_constant_p (rtx x, enum riscv_symbol_type *symbol_type)
+{
+  rtx offset;
+
+  split_const (x, &x, &offset);
+  if (UNSPEC_ADDRESS_P (x))
+    {
+      *symbol_type = UNSPEC_ADDRESS_TYPE (x);
+      x = UNSPEC_ADDRESS (x);
+    }
+  else if (GET_CODE (x) == SYMBOL_REF || GET_CODE (x) == LABEL_REF)
+    *symbol_type = riscv_classify_symbol (x);
+  else
+    return false;
+
+  if (offset == const0_rtx)
+    return true;
+
+  /* Check whether a nonzero offset is valid for the underlying
+     relocations.  */
+  switch (*symbol_type)
+    {
+    case SYMBOL_ABSOLUTE:
+    case SYMBOL_TLS_LE:
+      return (int32_t) INTVAL (offset) == INTVAL (offset);
+
+    default:
+      return false;
+    }
+  gcc_unreachable ();
+}
+
+/* Returns the number of instructions necessary to reference a symbol. */
+
+static int riscv_symbol_insns (enum riscv_symbol_type type)
+{
+  switch (type)
+    {
+    case SYMBOL_TLS: return 0; /* Depends on the TLS model. */
+    case SYMBOL_ABSOLUTE: return 2; /* LUI + the reference itself */
+    case SYMBOL_TLS_LE: return 3; /* LUI + ADD TP + the reference itself */
+    case SYMBOL_GOT_DISP: return 3; /* AUIPC + LD GOT + the reference itself */
+    default: gcc_unreachable();
+    }
+}
+
+/* Implement TARGET_LEGITIMATE_CONSTANT_P.  */
+
+static bool
+riscv_legitimate_constant_p (enum machine_mode mode ATTRIBUTE_UNUSED, rtx x)
+{
+  return riscv_const_insns (x) > 0;
+}
+
+/* Implement TARGET_CANNOT_FORCE_CONST_MEM.  */
+
+static bool
+riscv_cannot_force_const_mem (enum machine_mode mode ATTRIBUTE_UNUSED, rtx x)
+{
+  enum riscv_symbol_type type;
+  rtx base, offset;
+
+  /* There is no assembler syntax for expressing an address-sized
+     high part.  */
+  if (GET_CODE (x) == HIGH)
+    return true;
+
+  split_const (x, &base, &offset);
+  if (riscv_symbolic_constant_p (base, &type))
+    {
+      /* As an optimization, don't spill symbolic constants that are as
+	 cheap to rematerialize as to access in the constant pool.  */
+      if (SMALL_OPERAND (INTVAL (offset)) && riscv_symbol_insns (type) > 0)
+	return true;
+
+      /* As an optimization, avoid needlessly generate dynamic relocations.  */
+      if (flag_pic)
+	return true;
+    }
+
+  /* TLS symbols must be computed by riscv_legitimize_move.  */
+  if (tls_referenced_p (x))
+    return true;
+
+  return false;
+}
+
+/* Return true if register REGNO is a valid base register for mode MODE.
+   STRICT_P is true if REG_OK_STRICT is in effect.  */
+
+int
+riscv_regno_mode_ok_for_base_p (int regno, enum machine_mode mode ATTRIBUTE_UNUSED,
+			       bool strict_p)
+{
+  if (!HARD_REGISTER_NUM_P (regno))
+    {
+      if (!strict_p)
+	return true;
+      regno = reg_renumber[regno];
+    }
+
+  /* These fake registers will be eliminated to either the stack or
+     hard frame pointer, both of which are usually valid base registers.
+     Reload deals with the cases where the eliminated form isn't valid.  */
+  if (regno == ARG_POINTER_REGNUM || regno == FRAME_POINTER_REGNUM)
+    return true;
+
+  return GP_REG_P (regno);
+}
+
+/* Return true if X is a valid base register for mode MODE.
+   STRICT_P is true if REG_OK_STRICT is in effect.  */
+
+static bool
+riscv_valid_base_register_p (rtx x, enum machine_mode mode, bool strict_p)
+{
+  if (!strict_p && GET_CODE (x) == SUBREG)
+    x = SUBREG_REG (x);
+
+  return (REG_P (x)
+	  && riscv_regno_mode_ok_for_base_p (REGNO (x), mode, strict_p));
+}
+
+/* Return true if, for every base register BASE_REG, (plus BASE_REG X)
+   can address a value of mode MODE.  */
+
+static bool
+riscv_valid_offset_p (rtx x, enum machine_mode mode)
+{
+  /* Check that X is a signed 12-bit number.  */
+  if (!const_arith_operand (x, Pmode))
+    return false;
+
+  /* We may need to split multiword moves, so make sure that every word
+     is accessible.  */
+  if (GET_MODE_SIZE (mode) > UNITS_PER_WORD
+      && !SMALL_OPERAND (INTVAL (x) + GET_MODE_SIZE (mode) - UNITS_PER_WORD))
+    return false;
+
+  return true;
+}
+
+/* Return true if a LO_SUM can address a value of mode MODE when the
+   LO_SUM symbol has type SYMBOL_TYPE.  */
+
+static bool
+riscv_valid_lo_sum_p (enum riscv_symbol_type symbol_type, enum machine_mode mode)
+{
+  /* Check that symbols of type SYMBOL_TYPE can be used to access values
+     of mode MODE.  */
+  if (riscv_symbol_insns (symbol_type) == 0)
+    return false;
+
+  /* Check that there is a known low-part relocation.  */
+  if (riscv_lo_relocs[symbol_type] == NULL)
+    return false;
+
+  /* We may need to split multiword moves, so make sure that each word
+     can be accessed without inducing a carry.  This is mainly needed
+     for o64, which has historically only guaranteed 64-bit alignment
+     for 128-bit types.  */
+  if (GET_MODE_SIZE (mode) > UNITS_PER_WORD
+      && GET_MODE_BITSIZE (mode) > GET_MODE_ALIGNMENT (mode))
+    return false;
+
+  return true;
+}
+
+/* Return true if X is a valid address for machine mode MODE.  If it is,
+   fill in INFO appropriately.  STRICT_P is true if REG_OK_STRICT is in
+   effect.  */
+
+static bool
+riscv_classify_address (struct riscv_address_info *info, rtx x,
+		       enum machine_mode mode, bool strict_p)
+{
+  switch (GET_CODE (x))
+    {
+    case REG:
+    case SUBREG:
+      info->type = ADDRESS_REG;
+      info->reg = x;
+      info->offset = const0_rtx;
+      return riscv_valid_base_register_p (info->reg, mode, strict_p);
+
+    case PLUS:
+      info->type = ADDRESS_REG;
+      info->reg = XEXP (x, 0);
+      info->offset = XEXP (x, 1);
+      return (riscv_valid_base_register_p (info->reg, mode, strict_p)
+	      && riscv_valid_offset_p (info->offset, mode));
+
+    case LO_SUM:
+      info->type = ADDRESS_LO_SUM;
+      info->reg = XEXP (x, 0);
+      info->offset = XEXP (x, 1);
+      /* We have to trust the creator of the LO_SUM to do something vaguely
+	 sane.  Target-independent code that creates a LO_SUM should also
+	 create and verify the matching HIGH.  Target-independent code that
+	 adds an offset to a LO_SUM must prove that the offset will not
+	 induce a carry.  Failure to do either of these things would be
+	 a bug, and we are not required to check for it here.  The RISCV
+	 backend itself should only create LO_SUMs for valid symbolic
+	 constants, with the high part being either a HIGH or a copy
+	 of _gp. */
+      info->symbol_type
+	= riscv_classify_symbolic_expression (info->offset);
+      return (riscv_valid_base_register_p (info->reg, mode, strict_p)
+	      && riscv_valid_lo_sum_p (info->symbol_type, mode));
+
+    case CONST_INT:
+      /* Small-integer addresses don't occur very often, but they
+	 are legitimate if $0 is a valid base register.  */
+      info->type = ADDRESS_CONST_INT;
+      return SMALL_OPERAND (INTVAL (x));
+
+    default:
+      return false;
+    }
+}
+
+/* Implement TARGET_LEGITIMATE_ADDRESS_P.  */
+
+static bool
+riscv_legitimate_address_p (enum machine_mode mode, rtx x, bool strict_p)
+{
+  struct riscv_address_info addr;
+
+  return riscv_classify_address (&addr, x, mode, strict_p);
+}
+
+/* Return the number of instructions needed to load or store a value
+   of mode MODE at address X.  Return 0 if X isn't valid for MODE.
+   Assume that multiword moves may need to be split into word moves
+   if MIGHT_SPLIT_P, otherwise assume that a single load or store is
+   enough. */
+
+int
+riscv_address_insns (rtx x, enum machine_mode mode, bool might_split_p)
+{
+  struct riscv_address_info addr;
+  int n = 1;
+
+  if (!riscv_classify_address (&addr, x, mode, false))
+    return 0;
+
+  /* BLKmode is used for single unaligned loads and stores and should
+     not count as a multiword mode. */
+  if (mode != BLKmode && might_split_p)
+    n += (GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+
+  if (addr.type == ADDRESS_LO_SUM)
+    n += riscv_symbol_insns (addr.symbol_type) - 1;
+
+  return n;
+}
+
+/* Return the number of instructions needed to load constant X.
+   Return 0 if X isn't a valid constant.  */
+
+int
+riscv_const_insns (rtx x)
+{
+  enum riscv_symbol_type symbol_type;
+  rtx offset;
+
+  switch (GET_CODE (x))
+    {
+    case HIGH:
+      if (!riscv_symbolic_constant_p (XEXP (x, 0), &symbol_type)
+	  || !riscv_hi_relocs[symbol_type])
+	return 0;
+
+      /* This is simply an LUI. */
+      return 1;
+
+    case CONST_INT:
+      {
+	int cost = riscv_integer_cost (INTVAL (x));
+	/* Force complicated constants to memory. */
+	return cost < 4 ? cost : 0;
+      }
+
+    case CONST_DOUBLE:
+    case CONST_VECTOR:
+      /* Allow zeros for normal mode, where we can use x0.  */
+      return x == CONST0_RTX (GET_MODE (x)) ? 1 : 0;
+
+    case CONST:
+      /* See if we can refer to X directly.  */
+      if (riscv_symbolic_constant_p (x, &symbol_type))
+	return riscv_symbol_insns (symbol_type);
+
+      /* Otherwise try splitting the constant into a base and offset.  */
+      split_const (x, &x, &offset);
+      if (offset != 0)
+	{
+	  int n = riscv_const_insns (x);
+	  if (n != 0)
+	    return n + riscv_integer_cost (INTVAL (offset));
+	}
+      return 0;
+
+    case SYMBOL_REF:
+    case LABEL_REF:
+      return riscv_symbol_insns (riscv_classify_symbol (x));
+
+    default:
+      return 0;
+    }
+}
+
+/* X is a doubleword constant that can be handled by splitting it into
+   two words and loading each word separately.  Return the number of
+   instructions required to do this.  */
+
+int
+riscv_split_const_insns (rtx x)
+{
+  unsigned int low, high;
+
+  low = riscv_const_insns (riscv_subword (x, false));
+  high = riscv_const_insns (riscv_subword (x, true));
+  gcc_assert (low > 0 && high > 0);
+  return low + high;
+}
+
+/* Return the number of instructions needed to implement INSN,
+   given that it loads from or stores to MEM. */
+
+int
+riscv_load_store_insns (rtx mem, rtx_insn *insn)
+{
+  enum machine_mode mode;
+  bool might_split_p;
+  rtx set;
+
+  gcc_assert (MEM_P (mem));
+  mode = GET_MODE (mem);
+
+  /* Try to prove that INSN does not need to be split.  */
+  might_split_p = true;
+  if (GET_MODE_BITSIZE (mode) == 64)
+    {
+      set = single_set (insn);
+      if (set && !riscv_split_64bit_move_p (SET_DEST (set), SET_SRC (set)))
+	might_split_p = false;
+    }
+
+  return riscv_address_insns (XEXP (mem, 0), mode, might_split_p);
+}
+
+/* Emit a move from SRC to DEST.  Assume that the move expanders can
+   handle all moves if !can_create_pseudo_p ().  The distinction is
+   important because, unlike emit_move_insn, the move expanders know
+   how to force Pmode objects into the constant pool even when the
+   constant pool address is not itself legitimate.  */
+
+rtx
+riscv_emit_move (rtx dest, rtx src)
+{
+  return (can_create_pseudo_p ()
+	  ? emit_move_insn (dest, src)
+	  : emit_move_insn_1 (dest, src));
+}
+
+/* Emit an instruction of the form (set TARGET (CODE OP0 OP1)).  */
+
+static void
+riscv_emit_binary (enum rtx_code code, rtx target, rtx op0, rtx op1)
+{
+  emit_insn (gen_rtx_SET (VOIDmode, target,
+			  gen_rtx_fmt_ee (code, GET_MODE (target), op0, op1)));
+}
+
+/* Compute (CODE OP0 OP1) and store the result in a new register
+   of mode MODE.  Return that new register.  */
+
+static rtx
+riscv_force_binary (enum machine_mode mode, enum rtx_code code, rtx op0, rtx op1)
+{
+  rtx reg;
+
+  reg = gen_reg_rtx (mode);
+  riscv_emit_binary (code, reg, op0, op1);
+  return reg;
+}
+
+/* Copy VALUE to a register and return that register.  If new pseudos
+   are allowed, copy it into a new register, otherwise use DEST.  */
+
+static rtx
+riscv_force_temporary (rtx dest, rtx value)
+{
+  if (can_create_pseudo_p ())
+    return force_reg (Pmode, value);
+  else
+    {
+      riscv_emit_move (dest, value);
+      return dest;
+    }
+}
+
+/* Wrap symbol or label BASE in an UNSPEC address of type SYMBOL_TYPE,
+   then add CONST_INT OFFSET to the result.  */
+
+static rtx
+riscv_unspec_address_offset (rtx base, rtx offset,
+			    enum riscv_symbol_type symbol_type)
+{
+  base = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, base),
+			 UNSPEC_ADDRESS_FIRST + symbol_type);
+  if (offset != const0_rtx)
+    base = gen_rtx_PLUS (Pmode, base, offset);
+  return gen_rtx_CONST (Pmode, base);
+}
+
+/* Return an UNSPEC address with underlying address ADDRESS and symbol
+   type SYMBOL_TYPE.  */
+
+rtx
+riscv_unspec_address (rtx address, enum riscv_symbol_type symbol_type)
+{
+  rtx base, offset;
+
+  split_const (address, &base, &offset);
+  return riscv_unspec_address_offset (base, offset, symbol_type);
+}
+
+/* If OP is an UNSPEC address, return the address to which it refers,
+   otherwise return OP itself.  */
+
+static rtx
+riscv_strip_unspec_address (rtx op)
+{
+  rtx base, offset;
+
+  split_const (op, &base, &offset);
+  if (UNSPEC_ADDRESS_P (base))
+    op = plus_constant (Pmode, UNSPEC_ADDRESS (base), INTVAL (offset));
+  return op;
+}
+
+/* If riscv_unspec_address (ADDR, SYMBOL_TYPE) is a 32-bit value, add the
+   high part to BASE and return the result.  Just return BASE otherwise.
+   TEMP is as for riscv_force_temporary.
+
+   The returned expression can be used as the first operand to a LO_SUM.  */
+
+static rtx
+riscv_unspec_offset_high (rtx temp, rtx addr, enum riscv_symbol_type symbol_type)
+{
+  addr = gen_rtx_HIGH (Pmode, riscv_unspec_address (addr, symbol_type));
+  return riscv_force_temporary (temp, addr);
+}
+
+/* Load an entry from the GOT. */
+static rtx riscv_got_load_tls_gd(rtx dest, rtx sym)
+{
+  return (Pmode == DImode ? gen_got_load_tls_gddi(dest, sym) : gen_got_load_tls_gdsi(dest, sym));
+}
+
+static rtx riscv_got_load_tls_ie(rtx dest, rtx sym)
+{
+  return (Pmode == DImode ? gen_got_load_tls_iedi(dest, sym) : gen_got_load_tls_iesi(dest, sym));
+}
+
+static rtx riscv_tls_add_tp_le(rtx dest, rtx base, rtx sym)
+{
+  rtx tp = gen_rtx_REG (Pmode, THREAD_POINTER_REGNUM);
+  return (Pmode == DImode ? gen_tls_add_tp_ledi(dest, base, tp, sym) : gen_tls_add_tp_lesi(dest, base, tp, sym));
+}
+
+/* If MODE is MAX_MACHINE_MODE, ADDR appears as a move operand, otherwise
+   it appears in a MEM of that mode.  Return true if ADDR is a legitimate
+   constant in that context and can be split into high and low parts.
+   If so, and if LOW_OUT is nonnull, emit the high part and store the
+   low part in *LOW_OUT.  Leave *LOW_OUT unchanged otherwise.
+
+   TEMP is as for riscv_force_temporary and is used to load the high
+   part into a register.
+
+   When MODE is MAX_MACHINE_MODE, the low part is guaranteed to be
+   a legitimize SET_SRC for an .md pattern, otherwise the low part
+   is guaranteed to be a legitimate address for mode MODE.  */
+
+bool
+riscv_split_symbol (rtx temp, rtx addr, enum machine_mode mode, rtx *low_out)
+{
+  enum riscv_symbol_type symbol_type;
+  rtx high;
+
+  if ((GET_CODE (addr) == HIGH && mode == MAX_MACHINE_MODE)
+      || !riscv_symbolic_constant_p (addr, &symbol_type)
+      || riscv_symbol_insns (symbol_type) == 0
+      || !riscv_hi_relocs[symbol_type])
+    return false;
+
+  if (low_out)
+    {
+      switch (symbol_type)
+	{
+	case SYMBOL_ABSOLUTE:
+	  high = gen_rtx_HIGH (Pmode, copy_rtx (addr));
+      	  high = riscv_force_temporary (temp, high);
+      	  *low_out = gen_rtx_LO_SUM (Pmode, high, addr);
+	  break;
+	
+	default:
+	  gcc_unreachable ();
+	}
+    }
+
+  return true;
+}
+
+/* Return a legitimate address for REG + OFFSET.  TEMP is as for
+   riscv_force_temporary; it is only needed when OFFSET is not a
+   SMALL_OPERAND.  */
+
+static rtx
+riscv_add_offset (rtx temp, rtx reg, HOST_WIDE_INT offset)
+{
+  if (!SMALL_OPERAND (offset))
+    {
+      rtx high;
+
+      /* Leave OFFSET as a 16-bit offset and put the excess in HIGH.
+         The addition inside the macro CONST_HIGH_PART may cause an
+         overflow, so we need to force a sign-extension check.  */
+      high = gen_int_mode (CONST_HIGH_PART (offset), Pmode);
+      offset = CONST_LOW_PART (offset);
+      high = riscv_force_temporary (temp, high);
+      reg = riscv_force_temporary (temp, gen_rtx_PLUS (Pmode, high, reg));
+    }
+  return plus_constant (Pmode, reg, offset);
+}
+
+/* The __tls_get_attr symbol.  */
+static GTY(()) rtx riscv_tls_symbol;
+
+/* Return an instruction sequence that calls __tls_get_addr.  SYM is
+   the TLS symbol we are referencing and TYPE is the symbol type to use
+   (either global dynamic or local dynamic).  RESULT is an RTX for the
+   return value location.  */
+
+static rtx
+riscv_call_tls_get_addr (rtx sym, rtx result)
+{
+  rtx insn, a0 = gen_rtx_REG (Pmode, GP_ARG_FIRST);
+
+  if (!riscv_tls_symbol)
+    riscv_tls_symbol = init_one_libfunc ("__tls_get_addr");
+
+  start_sequence ();
+  
+  emit_insn (riscv_got_load_tls_gd (a0, sym));
+  insn = riscv_expand_call (false, result, riscv_tls_symbol, const0_rtx);
+  RTL_CONST_CALL_P (insn) = 1;
+  use_reg (&CALL_INSN_FUNCTION_USAGE (insn), a0);
+  insn = get_insns ();
+
+  end_sequence ();
+
+  return insn;
+}
+
+/* Generate the code to access LOC, a thread-local SYMBOL_REF, and return
+   its address.  The return value will be both a valid address and a valid
+   SET_SRC (either a REG or a LO_SUM).  */
+
+static rtx
+riscv_legitimize_tls_address (rtx loc)
+{
+  rtx dest, insn, tp, tmp1;
+  enum tls_model model = SYMBOL_REF_TLS_MODEL (loc);
+
+  /* Since we support TLS copy relocs, non-PIC TLS accesses may all use LE.  */
+  if (!flag_pic)
+    model = TLS_MODEL_LOCAL_EXEC;
+
+  switch (model)
+    {
+    case TLS_MODEL_LOCAL_DYNAMIC:
+      /* Rely on section anchors for the optimization that LDM TLS
+	 provides.  The anchor's address is loaded with GD TLS. */
+    case TLS_MODEL_GLOBAL_DYNAMIC:
+      tmp1 = gen_rtx_REG (Pmode, GP_RETURN);
+      insn = riscv_call_tls_get_addr (loc, tmp1);
+      dest = gen_reg_rtx (Pmode);
+      emit_libcall_block (insn, dest, tmp1, loc);
+      break;
+
+    case TLS_MODEL_INITIAL_EXEC:
+      /* la.tls.ie; tp-relative add */
+      tp = gen_rtx_REG (Pmode, THREAD_POINTER_REGNUM);
+      tmp1 = gen_reg_rtx (Pmode);
+      emit_insn (riscv_got_load_tls_ie (tmp1, loc));
+      dest = gen_reg_rtx (Pmode);
+      emit_insn (gen_add3_insn (dest, tmp1, tp));
+      break;
+
+    case TLS_MODEL_LOCAL_EXEC:
+      tmp1 = riscv_unspec_offset_high (NULL, loc, SYMBOL_TLS_LE);
+      dest = gen_reg_rtx (Pmode);
+      emit_insn (riscv_tls_add_tp_le (dest, tmp1, loc));
+      dest = gen_rtx_LO_SUM (Pmode, dest,
+			     riscv_unspec_address (loc, SYMBOL_TLS_LE));
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+  return dest;
+}
+
+/* If X is not a valid address for mode MODE, force it into a register.  */
+
+static rtx
+riscv_force_address (rtx x, enum machine_mode mode)
+{
+  if (!riscv_legitimate_address_p (mode, x, false))
+    x = force_reg (Pmode, x);
+  return x;
+}
+
+/* This function is used to implement LEGITIMIZE_ADDRESS.  If X can
+   be legitimized in a way that the generic machinery might not expect,
+   return a new address, otherwise return NULL.  MODE is the mode of
+   the memory being accessed.  */
+
+static rtx
+riscv_legitimize_address (rtx x, rtx oldx ATTRIBUTE_UNUSED,
+			 enum machine_mode mode)
+{
+  rtx addr;
+
+  if (riscv_tls_symbol_p (x))
+    return riscv_legitimize_tls_address (x);
+
+  /* See if the address can split into a high part and a LO_SUM.  */
+  if (riscv_split_symbol (NULL, x, mode, &addr))
+    return riscv_force_address (addr, mode);
+
+  /* Handle BASE + OFFSET using riscv_add_offset.  */
+  if (GET_CODE (x) == PLUS && CONST_INT_P (XEXP (x, 1))
+      && INTVAL (XEXP (x, 1)) != 0)
+    {
+      rtx base = XEXP (x, 0);
+      HOST_WIDE_INT offset = INTVAL (XEXP (x, 1));
+
+      if (!riscv_valid_base_register_p (base, mode, false))
+	base = copy_to_mode_reg (Pmode, base);
+      addr = riscv_add_offset (NULL, base, offset);
+      return riscv_force_address (addr, mode);
+    }
+
+  return x;
+}
+
+/* Load VALUE into DEST.  TEMP is as for riscv_force_temporary.  */
+
+void
+riscv_move_integer (rtx temp, rtx dest, HOST_WIDE_INT value)
+{
+  struct riscv_integer_op codes[RISCV_MAX_INTEGER_OPS];
+  enum machine_mode mode;
+  int i, num_ops;
+  rtx x;
+
+  mode = GET_MODE (dest);
+  num_ops = riscv_build_integer (codes, value, mode);
+
+  if (can_create_pseudo_p () && num_ops > 2 /* not a simple constant */
+      && num_ops >= riscv_split_integer_cost (value))
+    x = riscv_split_integer (value, mode);
+  else
+    {
+      /* Apply each binary operation to X. */
+      x = GEN_INT (codes[0].value);
+
+      for (i = 1; i < num_ops; i++)
+        {
+          if (!can_create_pseudo_p ())
+            {
+              emit_insn (gen_rtx_SET (VOIDmode, temp, x));
+              x = temp;
+            }
+          else
+            x = force_reg (mode, x);
+
+          x = gen_rtx_fmt_ee (codes[i].code, mode, x, GEN_INT (codes[i].value));
+        }
+    }
+
+  emit_insn (gen_rtx_SET (VOIDmode, dest, x));
+}
+
+/* Subroutine of riscv_legitimize_move.  Move constant SRC into register
+   DEST given that SRC satisfies immediate_operand but doesn't satisfy
+   move_operand.  */
+
+static void
+riscv_legitimize_const_move (enum machine_mode mode, rtx dest, rtx src)
+{
+  rtx base, offset;
+
+  /* Split moves of big integers into smaller pieces.  */
+  if (splittable_const_int_operand (src, mode))
+    {
+      riscv_move_integer (dest, dest, INTVAL (src));
+      return;
+    }
+
+  /* Split moves of symbolic constants into high/low pairs.  */
+  if (riscv_split_symbol (dest, src, MAX_MACHINE_MODE, &src))
+    {
+      emit_insn (gen_rtx_SET (VOIDmode, dest, src));
+      return;
+    }
+
+  /* Generate the appropriate access sequences for TLS symbols.  */
+  if (riscv_tls_symbol_p (src))
+    {
+      riscv_emit_move (dest, riscv_legitimize_tls_address (src));
+      return;
+    }
+
+  /* If we have (const (plus symbol offset)), and that expression cannot
+     be forced into memory, load the symbol first and add in the offset.  Also
+     prefer to do this even if the constant _can_ be forced into memory, as it
+     usually produces better code.  */
+  split_const (src, &base, &offset);
+  if (offset != const0_rtx
+      && (targetm.cannot_force_const_mem (mode, src) || can_create_pseudo_p ()))
+    {
+      base = riscv_force_temporary (dest, base);
+      riscv_emit_move (dest, riscv_add_offset (NULL, base, INTVAL (offset)));
+      return;
+    }
+
+  src = force_const_mem (mode, src);
+
+  /* When using explicit relocs, constant pool references are sometimes
+     not legitimate addresses.  */
+  riscv_split_symbol (dest, XEXP (src, 0), mode, &XEXP (src, 0));
+  riscv_emit_move (dest, src);
+}
+
+/* If (set DEST SRC) is not a valid move instruction, emit an equivalent
+   sequence that is valid.  */
+
+bool
+riscv_legitimize_move (enum machine_mode mode, rtx dest, rtx src)
+{
+  if (!register_operand (dest, mode) && !reg_or_0_operand (src, mode))
+    {
+      riscv_emit_move (dest, force_reg (mode, src));
+      return true;
+    }
+
+  /* We need to deal with constants that would be legitimate
+     immediate_operands but aren't legitimate move_operands.  */
+  if (CONSTANT_P (src) && !move_operand (src, mode))
+    {
+      riscv_legitimize_const_move (mode, dest, src);
+      set_unique_reg_note (get_last_insn (), REG_EQUAL, copy_rtx (src));
+      return true;
+    }
+  return false;
+}
+
+/* Return true if there is an instruction that implements CODE and accepts
+   X as an immediate operand. */
+
+static int
+riscv_immediate_operand_p (int code, HOST_WIDE_INT x)
+{
+  switch (code)
+    {
+    case ASHIFT:
+    case ASHIFTRT:
+    case LSHIFTRT:
+      /* All shift counts are truncated to a valid constant.  */
+      return true;
+
+    case AND:
+    case IOR:
+    case XOR:
+    case PLUS:
+    case LT:
+    case LTU:
+      /* These instructions take 12-bit signed immediates.  */
+      return SMALL_OPERAND (x);
+
+    case LE:
+      /* We add 1 to the immediate and use SLT.  */
+      return SMALL_OPERAND (x + 1);
+
+    case LEU:
+      /* Likewise SLTU, but reject the always-true case.  */
+      return SMALL_OPERAND (x + 1) && x + 1 != 0;
+
+    case GE:
+    case GEU:
+      /* We can emulate an immediate of 1 by using GT/GTU against x0. */
+      return x == 1;
+
+    default:
+      /* By default assume that x0 can be used for 0.  */
+      return x == 0;
+    }
+}
+
+/* Return the cost of binary operation X, given that the instruction
+   sequence for a word-sized or smaller operation takes SIGNLE_INSNS
+   instructions and that the sequence of a double-word operation takes
+   DOUBLE_INSNS instructions.  */
+
+static int
+riscv_binary_cost (rtx x, int single_insns, int double_insns)
+{
+  if (GET_MODE_SIZE (GET_MODE (x)) == UNITS_PER_WORD * 2)
+    return COSTS_N_INSNS (double_insns);
+  return COSTS_N_INSNS (single_insns);
+}
+
+/* Return the cost of sign-extending OP to mode MODE, not including the
+   cost of OP itself.  */
+
+static int
+riscv_sign_extend_cost (enum machine_mode mode, rtx op)
+{
+  if (MEM_P (op))
+    /* Extended loads are as cheap as unextended ones.  */
+    return 0;
+
+  if (TARGET_64BIT && mode == DImode && GET_MODE (op) == SImode)
+    /* A sign extension from SImode to DImode in 64-bit mode is free.  */
+    return 0;
+
+  /* We need to use a shift left and a shift right.  */
+  return COSTS_N_INSNS (2);
+}
+
+/* Return the cost of zero-extending OP to mode MODE, not including the
+   cost of OP itself.  */
+
+static int
+riscv_zero_extend_cost (enum machine_mode mode, rtx op)
+{
+  if (MEM_P (op))
+    /* Extended loads are as cheap as unextended ones.  */
+    return 0;
+
+  if ((TARGET_64BIT && mode == DImode && GET_MODE (op) == SImode) ||
+      ((mode == DImode || mode == SImode) && GET_MODE (op) == HImode))
+    /* We need a shift left by 32 bits and a shift right by 32 bits.  */
+    return COSTS_N_INSNS (2);
+
+  /* We can use ANDI.  */
+  return COSTS_N_INSNS (1);
+}
+
+/* Implement TARGET_RTX_COSTS.  */
+
+static bool
+riscv_rtx_costs (rtx x, int code, int outer_code, int opno ATTRIBUTE_UNUSED,
+		 int *total, bool speed)
+{
+  enum machine_mode mode = GET_MODE (x);
+  bool float_mode_p = FLOAT_MODE_P (mode);
+  int cost;
+
+  switch (code)
+    {
+    case CONST_INT:
+      if (riscv_immediate_operand_p (outer_code, INTVAL (x)))
+	{
+	  *total = 0;
+	  return true;
+	}
+      /* Fall through.  */
+
+    case SYMBOL_REF:
+    case LABEL_REF:
+    case CONST_DOUBLE:
+    case CONST:
+      if (speed)
+	*total = 1;
+      else if ((cost = riscv_const_insns (x)) > 0)
+	*total = COSTS_N_INSNS (cost);
+      else /* The instruction will be fetched from the constant pool.  */
+	*total = COSTS_N_INSNS (riscv_symbol_insns (SYMBOL_ABSOLUTE));
+      return true;
+
+    case MEM:
+      /* If the address is legitimate, return the number of
+	 instructions it needs.  */
+      if ((cost = riscv_address_insns (XEXP (x, 0), mode, true)) > 0)
+	{
+	  *total = COSTS_N_INSNS (cost + tune_info->memory_cost);
+	  return true;
+	}
+      /* Otherwise use the default handling.  */
+      return false;
+
+    case NOT:
+      *total = COSTS_N_INSNS (GET_MODE_SIZE (mode) > UNITS_PER_WORD ? 2 : 1);
+      return false;
+
+    case AND:
+    case IOR:
+    case XOR:
+      /* Double-word operations use two single-word operations.  */
+      *total = riscv_binary_cost (x, 1, 2);
+      return false;
+
+    case ASHIFT:
+    case ASHIFTRT:
+    case LSHIFTRT:
+      *total = riscv_binary_cost (x, 1, CONSTANT_P (XEXP (x, 1)) ? 4 : 9);
+      return false;
+
+    case ABS:
+      *total = COSTS_N_INSNS (float_mode_p ? 1 : 3);
+      return false;
+
+    case LO_SUM:
+      *total = set_src_cost (XEXP (x, 0), speed);
+      return true;
+
+    case LT:
+    case LTU:
+    case LE:
+    case LEU:
+    case GT:
+    case GTU:
+    case GE:
+    case GEU:
+    case EQ:
+    case NE:
+    case UNORDERED:
+    case LTGT:
+      /* Branch comparisons have VOIDmode, so use the first operand's
+	 mode instead.  */
+      mode = GET_MODE (XEXP (x, 0));
+      if (float_mode_p)
+	*total = tune_info->fp_add[mode == DFmode];
+      else
+	*total = riscv_binary_cost (x, 1, 3);
+      return false;
+
+    case MINUS:
+      if (float_mode_p
+	  && !HONOR_NANS (mode)
+	  && !HONOR_SIGNED_ZEROS (mode))
+	{
+	  /* See if we can use NMADD or NMSUB.  See riscv.md for the
+	     associated patterns.  */
+	  rtx op0 = XEXP (x, 0);
+	  rtx op1 = XEXP (x, 1);
+	  if (GET_CODE (op0) == MULT && GET_CODE (XEXP (op0, 0)) == NEG)
+	    {
+	      *total = (tune_info->fp_mul[mode == DFmode]
+			+ set_src_cost (XEXP (XEXP (op0, 0), 0), speed)
+			+ set_src_cost (XEXP (op0, 1), speed)
+			+ set_src_cost (op1, speed));
+	      return true;
+	    }
+	  if (GET_CODE (op1) == MULT)
+	    {
+	      *total = (tune_info->fp_mul[mode == DFmode]
+			+ set_src_cost (op0, speed)
+			+ set_src_cost (XEXP (op1, 0), speed)
+			+ set_src_cost (XEXP (op1, 1), speed));
+	      return true;
+	    }
+	}
+      /* Fall through.  */
+
+    case PLUS:
+      if (float_mode_p)
+	*total = tune_info->fp_add[mode == DFmode];
+      else
+	*total = riscv_binary_cost (x, 1, 4);
+      return false;
+
+    case NEG:
+      if (float_mode_p
+	  && !HONOR_NANS (mode)
+	  && HONOR_SIGNED_ZEROS (mode))
+	{
+	  /* See if we can use NMADD or NMSUB.  See riscv.md for the
+	     associated patterns.  */
+	  rtx op = XEXP (x, 0);
+	  if ((GET_CODE (op) == PLUS || GET_CODE (op) == MINUS)
+	      && GET_CODE (XEXP (op, 0)) == MULT)
+	    {
+	      *total = (tune_info->fp_mul[mode == DFmode]
+			+ set_src_cost (XEXP (XEXP (op, 0), 0), speed)
+			+ set_src_cost (XEXP (XEXP (op, 0), 1), speed)
+			+ set_src_cost (XEXP (op, 1), speed));
+	      return true;
+	    }
+	}
+
+      if (float_mode_p)
+	*total = tune_info->fp_add[mode == DFmode];
+      else
+	*total = COSTS_N_INSNS (GET_MODE_SIZE (mode) > UNITS_PER_WORD ? 4 : 1);
+      return false;
+
+    case MULT:
+      if (float_mode_p)
+	*total = tune_info->fp_mul[mode == DFmode];
+      else if (GET_MODE_SIZE (mode) > UNITS_PER_WORD)
+	*total = 3 * tune_info->int_mul[0] + COSTS_N_INSNS (2);
+      else if (!speed)
+	*total = COSTS_N_INSNS (1);
+      else
+	*total = tune_info->int_mul[mode == DImode];
+      return false;
+
+    case DIV:
+    case SQRT:
+    case MOD:
+      if (float_mode_p)
+	{
+	  *total = tune_info->fp_div[mode == DFmode];
+	  return false;
+	}
+      /* Fall through.  */
+
+    case UDIV:
+    case UMOD:
+      if (speed)
+	*total = tune_info->int_div[mode == DImode];
+      else
+	*total = COSTS_N_INSNS (1);
+      return false;
+
+    case SIGN_EXTEND:
+      *total = riscv_sign_extend_cost (mode, XEXP (x, 0));
+      return false;
+
+    case ZERO_EXTEND:
+      *total = riscv_zero_extend_cost (mode, XEXP (x, 0));
+      return false;
+
+    case FLOAT:
+    case UNSIGNED_FLOAT:
+    case FIX:
+    case FLOAT_EXTEND:
+    case FLOAT_TRUNCATE:
+      *total = tune_info->fp_add[mode == DFmode];
+      return false;
+
+    default:
+      return false;
+    }
+}
+
+/* Implement TARGET_ADDRESS_COST.  */
+
+static int
+riscv_address_cost (rtx addr, enum machine_mode mode,
+		    addr_space_t as ATTRIBUTE_UNUSED,
+		    bool speed ATTRIBUTE_UNUSED)
+{
+  return riscv_address_insns (addr, mode, false);
+}
+
+/* Return one word of double-word value OP.  HIGH_P is true to select the
+   high part or false to select the low part. */
+
+rtx
+riscv_subword (rtx op, bool high_p)
+{
+  unsigned int byte;
+  enum machine_mode mode;
+
+  mode = GET_MODE (op);
+  if (mode == VOIDmode)
+    mode = TARGET_64BIT ? TImode : DImode;
+
+  byte = high_p ? UNITS_PER_WORD : 0;
+
+  if (FP_REG_RTX_P (op))
+    return gen_rtx_REG (word_mode, REGNO (op) + high_p);
+
+  if (MEM_P (op))
+    return adjust_address (op, word_mode, byte);
+
+  return simplify_gen_subreg (word_mode, op, mode, byte);
+}
+
+/* Return true if a 64-bit move from SRC to DEST should be split into two.  */
+
+bool
+riscv_split_64bit_move_p (rtx dest, rtx src)
+{
+  /* All 64b moves are legal in 64b mode.  All 64b FPR <-> FPR and
+     FPR <-> MEM moves are legal in 32b mode, too.  Although
+     FPR <-> GPR moves are not available in general in 32b mode,
+     we can at least load 0 into an FPR with fcvt.d.w fpr, x0. */
+  return !(TARGET_64BIT
+	   || (FP_REG_RTX_P (src) && FP_REG_RTX_P (dest))
+	   || (FP_REG_RTX_P (dest) && MEM_P (src))
+	   || (FP_REG_RTX_P (src) && MEM_P (dest))
+	   || (FP_REG_RTX_P(dest) && src == CONST0_RTX(GET_MODE(src))));
+}
+
+/* Split a doubleword move from SRC to DEST.  On 32-bit targets,
+   this function handles 64-bit moves for which riscv_split_64bit_move_p
+   holds.  For 64-bit targets, this function handles 128-bit moves.  */
+
+void
+riscv_split_doubleword_move (rtx dest, rtx src)
+{
+  rtx low_dest;
+
+   /* The operation can be split into two normal moves.  Decide in
+      which order to do them.  */
+   low_dest = riscv_subword (dest, false);
+   if (REG_P (low_dest) && reg_overlap_mentioned_p (low_dest, src))
+     {
+       riscv_emit_move (riscv_subword (dest, true), riscv_subword (src, true));
+       riscv_emit_move (low_dest, riscv_subword (src, false));
+     }
+   else
+     {
+       riscv_emit_move (low_dest, riscv_subword (src, false));
+       riscv_emit_move (riscv_subword (dest, true), riscv_subword (src, true));
+     }
+}
+
+/* Return the appropriate instructions to move SRC into DEST.  Assume
+   that SRC is operand 1 and DEST is operand 0.  */
+
+const char *
+riscv_output_move (rtx dest, rtx src)
+{
+  enum rtx_code dest_code, src_code;
+  enum machine_mode mode;
+  bool dbl_p;
+
+  dest_code = GET_CODE (dest);
+  src_code = GET_CODE (src);
+  mode = GET_MODE (dest);
+  dbl_p = (GET_MODE_SIZE (mode) == 8);
+
+  if (dbl_p && riscv_split_64bit_move_p (dest, src))
+    return "#";
+
+  if (dest_code == REG && GP_REG_P (REGNO (dest)))
+    {
+      if (src_code == REG && FP_REG_P (REGNO (src)))
+	return dbl_p ? "fmv.x.d\t%0,%1" : "fmv.x.s\t%0,%1";
+
+      if (src_code == MEM)
+	switch (GET_MODE_SIZE (mode))
+	  {
+	  case 1: return "lbu\t%0,%1";
+	  case 2: return "lhu\t%0,%1";
+	  case 4: return "lw\t%0,%1";
+	  case 8: return "ld\t%0,%1";
+	  }
+
+      if (src_code == CONST_INT)
+	return "li\t%0,%1";
+
+      if (src_code == HIGH)
+	return "lui\t%0,%h1";
+
+      if (symbolic_operand (src, VOIDmode))
+	switch (riscv_classify_symbolic_expression (src))
+	  {
+	  case SYMBOL_GOT_DISP: return "la\t%0,%1";
+	  case SYMBOL_ABSOLUTE: return "lla\t%0,%1";
+	  default: gcc_unreachable();
+	  }
+    }
+  if ((src_code == REG && GP_REG_P (REGNO (src)))
+      || (src == CONST0_RTX (mode)))
+    {
+      if (dest_code == REG)
+	{
+	  if (GP_REG_P (REGNO (dest)))
+	    return "mv\t%0,%z1";
+
+	  if (FP_REG_P (REGNO (dest)))
+	    {
+	      if (!dbl_p)
+		return "fmv.s.x\t%0,%z1";
+	      if (TARGET_64BIT)
+		return "fmv.d.x\t%0,%z1";
+	      /* in RV32, we can emulate fmv.d.x %0, x0 using fcvt.d.w */
+	      gcc_assert (src == CONST0_RTX (mode));
+	      return "fcvt.d.w\t%0,x0";
+	    }
+	}
+      if (dest_code == MEM)
+	switch (GET_MODE_SIZE (mode))
+	  {
+	  case 1: return "sb\t%z1,%0";
+	  case 2: return "sh\t%z1,%0";
+	  case 4: return "sw\t%z1,%0";
+	  case 8: return "sd\t%z1,%0";
+	  }
+    }
+  if (src_code == REG && FP_REG_P (REGNO (src)))
+    {
+      if (dest_code == REG && FP_REG_P (REGNO (dest)))
+	return dbl_p ? "fmv.d\t%0,%1" : "fmv.s\t%0,%1";
+
+      if (dest_code == MEM)
+	return dbl_p ? "fsd\t%1,%0" : "fsw\t%1,%0";
+    }
+  if (dest_code == REG && FP_REG_P (REGNO (dest)))
+    {
+      if (src_code == MEM)
+	return dbl_p ? "fld\t%0,%1" : "flw\t%0,%1";
+    }
+  gcc_unreachable ();
+}
+
+/* Return true if CMP1 is a suitable second operand for integer ordering
+   test CODE.  See also the *sCC patterns in riscv.md.  */
+
+static bool
+riscv_int_order_operand_ok_p (enum rtx_code code, rtx cmp1)
+{
+  switch (code)
+    {
+    case GT:
+    case GTU:
+      return reg_or_0_operand (cmp1, VOIDmode);
+
+    case GE:
+    case GEU:
+      return cmp1 == const1_rtx;
+
+    case LT:
+    case LTU:
+      return arith_operand (cmp1, VOIDmode);
+
+    case LE:
+      return sle_operand (cmp1, VOIDmode);
+
+    case LEU:
+      return sleu_operand (cmp1, VOIDmode);
+
+    default:
+      gcc_unreachable ();
+    }
+}
+
+/* Return true if *CMP1 (of mode MODE) is a valid second operand for
+   integer ordering test *CODE, or if an equivalent combination can
+   be formed by adjusting *CODE and *CMP1.  When returning true, update
+   *CODE and *CMP1 with the chosen code and operand, otherwise leave
+   them alone.  */
+
+static bool
+riscv_canonicalize_int_order_test (enum rtx_code *code, rtx *cmp1,
+				  enum machine_mode mode)
+{
+  HOST_WIDE_INT plus_one;
+
+  if (riscv_int_order_operand_ok_p (*code, *cmp1))
+    return true;
+
+  if (CONST_INT_P (*cmp1))
+    switch (*code)
+      {
+      case LE:
+	plus_one = trunc_int_for_mode (UINTVAL (*cmp1) + 1, mode);
+	if (INTVAL (*cmp1) < plus_one)
+	  {
+	    *code = LT;
+	    *cmp1 = force_reg (mode, GEN_INT (plus_one));
+	    return true;
+	  }
+	break;
+
+      case LEU:
+	plus_one = trunc_int_for_mode (UINTVAL (*cmp1) + 1, mode);
+	if (plus_one != 0)
+	  {
+	    *code = LTU;
+	    *cmp1 = force_reg (mode, GEN_INT (plus_one));
+	    return true;
+	  }
+	break;
+
+      default:
+	break;
+      }
+  return false;
+}
+
+/* Compare CMP0 and CMP1 using ordering test CODE and store the result
+   in TARGET.  CMP0 and TARGET are register_operands.  If INVERT_PTR
+   is nonnull, it's OK to set TARGET to the inverse of the result and
+   flip *INVERT_PTR instead.  */
+
+static void
+riscv_emit_int_order_test (enum rtx_code code, bool *invert_ptr,
+			  rtx target, rtx cmp0, rtx cmp1)
+{
+  enum machine_mode mode;
+
+  /* First see if there is a RISCV instruction that can do this operation.
+     If not, try doing the same for the inverse operation.  If that also
+     fails, force CMP1 into a register and try again.  */
+  mode = GET_MODE (cmp0);
+  if (riscv_canonicalize_int_order_test (&code, &cmp1, mode))
+    riscv_emit_binary (code, target, cmp0, cmp1);
+  else
+    {
+      enum rtx_code inv_code = reverse_condition (code);
+      if (!riscv_canonicalize_int_order_test (&inv_code, &cmp1, mode))
+	{
+	  cmp1 = force_reg (mode, cmp1);
+	  riscv_emit_int_order_test (code, invert_ptr, target, cmp0, cmp1);
+	}
+      else if (invert_ptr == 0)
+	{
+	  rtx inv_target;
+
+	  inv_target = riscv_force_binary (GET_MODE (target),
+					  inv_code, cmp0, cmp1);
+	  riscv_emit_binary (XOR, target, inv_target, const1_rtx);
+	}
+      else
+	{
+	  *invert_ptr = !*invert_ptr;
+	  riscv_emit_binary (inv_code, target, cmp0, cmp1);
+	}
+    }
+}
+
+/* Return a register that is zero iff CMP0 and CMP1 are equal.
+   The register will have the same mode as CMP0.  */
+
+static rtx
+riscv_zero_if_equal (rtx cmp0, rtx cmp1)
+{
+  if (cmp1 == const0_rtx)
+    return cmp0;
+
+  return expand_binop (GET_MODE (cmp0), sub_optab,
+		       cmp0, cmp1, 0, 0, OPTAB_DIRECT);
+}
+
+/* Return false if we can easily emit code for the FP comparison specified
+   by *CODE.  If not, set *CODE to its inverse and return true. */
+
+static bool
+riscv_reversed_fp_cond (enum rtx_code *code)
+{
+  switch (*code)
+    {
+    case EQ:
+    case LT:
+    case LE:
+    case GT:
+    case GE:
+    case LTGT:
+    case ORDERED:
+      /* We know how to emit code for these cases... */
+      return false;
+
+    default:
+      /* ...but we must invert these and rely on the others. */
+      *code = reverse_condition_maybe_unordered (*code);
+      return true;
+    }
+}
+
+/* Convert a comparison into something that can be used in a branch or
+   conditional move.  On entry, *OP0 and *OP1 are the values being
+   compared and *CODE is the code used to compare them.
+
+   Update *CODE, *OP0 and *OP1 so that they describe the final comparison. */
+
+static void
+riscv_emit_compare (enum rtx_code *code, rtx *op0, rtx *op1)
+{
+  rtx cmp_op0 = *op0;
+  rtx cmp_op1 = *op1;
+
+  if (GET_MODE_CLASS (GET_MODE (*op0)) == MODE_INT)
+    {
+      if (splittable_const_int_operand (cmp_op1, VOIDmode))
+	{
+	  HOST_WIDE_INT rhs = INTVAL (cmp_op1), new_rhs;
+	  enum rtx_code new_code;
+
+	  switch (*code)
+	    {
+	    case LTU: new_rhs = rhs - 1; new_code = LEU; goto try_new_rhs;
+	    case LEU: new_rhs = rhs + 1; new_code = LTU; goto try_new_rhs;
+	    case GTU: new_rhs = rhs + 1; new_code = GEU; goto try_new_rhs;
+	    case GEU: new_rhs = rhs - 1; new_code = GTU; goto try_new_rhs;
+	    case LT: new_rhs = rhs - 1; new_code = LE; goto try_new_rhs;
+	    case LE: new_rhs = rhs + 1; new_code = LT; goto try_new_rhs;
+	    case GT: new_rhs = rhs + 1; new_code = GE; goto try_new_rhs;
+	    case GE: new_rhs = rhs - 1; new_code = GT;
+	    try_new_rhs:
+	      /* Convert e.g. OP0 > 4095 into OP0 >= 4096.  */
+	      if ((rhs < 0) == (new_rhs < 0)
+		  && riscv_integer_cost (new_rhs) < riscv_integer_cost (rhs))
+		{
+		  *op1 = GEN_INT (new_rhs);
+		  *code = new_code;
+		}
+	      break;
+
+	    case EQ:
+	    case NE:
+	      /* Convert e.g. OP0 == 2048 into OP0 - 2048 == 0.  */
+	      if (SMALL_OPERAND (-rhs))
+		{
+		  *op0 = gen_reg_rtx (GET_MODE (cmp_op0));
+		  riscv_emit_binary (PLUS, *op0, cmp_op0, GEN_INT (-rhs));
+		  *op1 = const0_rtx;
+		}
+	    default:
+	      break;
+	    }
+	}
+
+      if (*op1 != const0_rtx)
+	*op1 = force_reg (GET_MODE (cmp_op0), *op1);
+    }
+  else
+    {
+      /* For FP comparisons, set an integer register with the result of the
+	 comparison, then branch on it. */
+      rtx tmp0, tmp1, final_op;
+      enum rtx_code fp_code = *code;
+      *code = riscv_reversed_fp_cond (&fp_code) ? EQ : NE;
+
+      switch (fp_code)
+	{
+	case ORDERED:
+	  /* a == a && b == b */
+	  tmp0 = gen_reg_rtx (SImode);
+	  riscv_emit_binary (EQ, tmp0, cmp_op0, cmp_op0);
+	  tmp1 = gen_reg_rtx (SImode);
+	  riscv_emit_binary (EQ, tmp1, cmp_op1, cmp_op1);
+	  final_op = gen_reg_rtx (SImode);
+	  riscv_emit_binary (AND, final_op, tmp0, tmp1);
+	  break;
+
+	case LTGT:
+	  /* a < b || a > b */
+	  tmp0 = gen_reg_rtx (SImode);
+	  riscv_emit_binary (LT, tmp0, cmp_op0, cmp_op1);
+	  tmp1 = gen_reg_rtx (SImode);
+	  riscv_emit_binary (GT, tmp1, cmp_op0, cmp_op1);
+	  final_op = gen_reg_rtx (SImode);
+	  riscv_emit_binary (IOR, final_op, tmp0, tmp1);
+	  break;
+
+	case EQ:
+	case LE:
+	case LT:
+	case GE:
+	case GT:
+	  /* We have instructions for these cases. */
+	  final_op = gen_reg_rtx (SImode);
+	  riscv_emit_binary (fp_code, final_op, cmp_op0, cmp_op1);
+	  break;
+
+	default:
+	  gcc_unreachable ();
+	}
+
+      /* Compare the binary result against 0. */
+      *op0 = final_op;
+      *op1 = const0_rtx;
+    }
+}
+
+/* Try performing the comparison in OPERANDS[1], whose arms are OPERANDS[2]
+   and OPERAND[3].  Store the result in OPERANDS[0].
+
+   On 64-bit targets, the mode of the comparison and target will always be
+   SImode, thus possibly narrower than that of the comparison's operands.  */
+
+void
+riscv_expand_scc (rtx operands[])
+{
+  rtx target = operands[0];
+  enum rtx_code code = GET_CODE (operands[1]);
+  rtx op0 = operands[2];
+  rtx op1 = operands[3];
+
+  gcc_assert (GET_MODE_CLASS (GET_MODE (op0)) == MODE_INT);
+
+  if (code == EQ || code == NE)
+    {
+      rtx zie = riscv_zero_if_equal (op0, op1);
+      riscv_emit_binary (code, target, zie, const0_rtx);
+    }
+  else
+    riscv_emit_int_order_test (code, 0, target, op0, op1);
+}
+
+/* Compare OPERANDS[1] with OPERANDS[2] using comparison code
+   CODE and jump to OPERANDS[3] if the condition holds.  */
+
+void
+riscv_expand_conditional_branch (rtx *operands)
+{
+  enum rtx_code code = GET_CODE (operands[0]);
+  rtx op0 = operands[1];
+  rtx op1 = operands[2];
+  rtx condition;
+
+  riscv_emit_compare (&code, &op0, &op1);
+  condition = gen_rtx_fmt_ee (code, VOIDmode, op0, op1);
+  emit_jump_insn (gen_condjump (condition, operands[3]));
+}
+
+/* Implement TARGET_FUNCTION_ARG_BOUNDARY.  Every parameter gets at
+   least PARM_BOUNDARY bits of alignment, but will be given anything up
+   to STACK_BOUNDARY bits if the type requires it.  */
+
+static unsigned int
+riscv_function_arg_boundary (enum machine_mode mode, const_tree type)
+{
+  unsigned int alignment;
+
+  alignment = type ? TYPE_ALIGN (type) : GET_MODE_ALIGNMENT (mode);
+  if (alignment < PARM_BOUNDARY)
+    alignment = PARM_BOUNDARY;
+  if (alignment > STACK_BOUNDARY)
+    alignment = STACK_BOUNDARY;
+  return alignment;
+}
+
+/* Fill INFO with information about a single argument.  CUM is the
+   cumulative state for earlier arguments.  MODE is the mode of this
+   argument and TYPE is its type (if known).  NAMED is true if this
+   is a named (fixed) argument rather than a variable one.  */
+
+static void
+riscv_get_arg_info (struct riscv_arg_info *info, const CUMULATIVE_ARGS *cum,
+		   enum machine_mode mode, const_tree type, bool named)
+{
+  bool doubleword_aligned_p;
+  unsigned int num_bytes, num_words, max_regs;
+
+  /* Work out the size of the argument.  */
+  num_bytes = type ? int_size_in_bytes (type) : GET_MODE_SIZE (mode);
+  num_words = (num_bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+
+  /* Scalar, complex and vector floating-point types are passed in
+     floating-point registers, as long as this is a named rather
+     than a variable argument.  */
+  info->fpr_p = (named
+		 && (type == 0 || FLOAT_TYPE_P (type))
+		 && (GET_MODE_CLASS (mode) == MODE_FLOAT
+		     || GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
+		     || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT)
+		 && GET_MODE_UNIT_SIZE (mode) <= UNITS_PER_FPVALUE);
+
+  /* Complex floats should only go into FPRs if there are two FPRs free,
+     otherwise they should be passed in the same way as a struct
+     containing two floats.  */
+  if (info->fpr_p
+      && GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT
+      && GET_MODE_UNIT_SIZE (mode) < UNITS_PER_FPVALUE)
+    {
+      if (cum->num_gprs >= MAX_ARGS_IN_REGISTERS - 1)
+        info->fpr_p = false;
+      else
+        num_words = 2;
+    }
+
+  /* See whether the argument has doubleword alignment.  */
+  doubleword_aligned_p = (riscv_function_arg_boundary (mode, type)
+			  > BITS_PER_WORD);
+
+  /* Set REG_OFFSET to the register count we're interested in.
+     The EABI allocates the floating-point registers separately,
+     but the other ABIs allocate them like integer registers.  */
+  info->reg_offset = cum->num_gprs;
+
+  /* Advance to an even register if the argument is doubleword-aligned.  */
+  if (doubleword_aligned_p)
+    info->reg_offset += info->reg_offset & 1;
+
+  /* Work out the offset of a stack argument.  */
+  info->stack_offset = cum->stack_words;
+  if (doubleword_aligned_p)
+    info->stack_offset += info->stack_offset & 1;
+
+  max_regs = MAX_ARGS_IN_REGISTERS - info->reg_offset;
+
+  /* Partition the argument between registers and stack.  */
+  info->reg_words = MIN (num_words, max_regs);
+  info->stack_words = num_words - info->reg_words;
+}
+
+/* INFO describes a register argument that has the normal format for the
+   argument's mode.  Return the register it uses, assuming that FPRs are
+   available if HARD_FLOAT_P.  */
+
+static unsigned int
+riscv_arg_regno (const struct riscv_arg_info *info, bool hard_float_p)
+{
+  if (!info->fpr_p || !hard_float_p)
+    return GP_ARG_FIRST + info->reg_offset;
+  else
+    return FP_ARG_FIRST + info->reg_offset;
+}
+
+/* Implement TARGET_FUNCTION_ARG.  */
+
+static rtx
+riscv_function_arg (cumulative_args_t cum_v, enum machine_mode mode,
+		    const_tree type, bool named)
+{
+  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
+  struct riscv_arg_info info;
+
+  if (mode == VOIDmode)
+    return NULL;
+
+  riscv_get_arg_info (&info, cum, mode, type, named);
+
+  /* Return straight away if the whole argument is passed on the stack.  */
+  if (info.reg_offset == MAX_ARGS_IN_REGISTERS)
+    return NULL;
+
+  /* The n32 and n64 ABIs say that if any 64-bit chunk of the structure
+     contains a double in its entirety, then that 64-bit chunk is passed
+     in a floating-point register.  */
+  if (TARGET_HARD_FLOAT
+      && named
+      && type != 0
+      && TREE_CODE (type) == RECORD_TYPE
+      && TYPE_SIZE_UNIT (type)
+      && tree_fits_uhwi_p (TYPE_SIZE_UNIT (type)))
+    {
+      tree field;
+
+      /* First check to see if there is any such field.  */
+      for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
+	if (TREE_CODE (field) == FIELD_DECL
+	    && SCALAR_FLOAT_TYPE_P (TREE_TYPE (field))
+	    && TYPE_PRECISION (TREE_TYPE (field)) == BITS_PER_WORD
+	    && tree_fits_shwi_p (bit_position (field))
+	    && int_bit_position (field) % BITS_PER_WORD == 0)
+	  break;
+
+      if (field != 0)
+	{
+	  /* Now handle the special case by returning a PARALLEL
+	     indicating where each 64-bit chunk goes.  INFO.REG_WORDS
+	     chunks are passed in registers.  */
+	  unsigned int i;
+	  HOST_WIDE_INT bitpos;
+	  rtx ret;
+
+	  /* assign_parms checks the mode of ENTRY_PARM, so we must
+	     use the actual mode here.  */
+	  ret = gen_rtx_PARALLEL (mode, rtvec_alloc (info.reg_words));
+
+	  bitpos = 0;
+	  field = TYPE_FIELDS (type);
+	  for (i = 0; i < info.reg_words; i++)
+	    {
+	      rtx reg;
+
+	      for (; field; field = DECL_CHAIN (field))
+		if (TREE_CODE (field) == FIELD_DECL
+		    && int_bit_position (field) >= bitpos)
+		  break;
+
+	      if (field
+		  && int_bit_position (field) == bitpos
+		  && SCALAR_FLOAT_TYPE_P (TREE_TYPE (field))
+		  && TYPE_PRECISION (TREE_TYPE (field)) == BITS_PER_WORD)
+		reg = gen_rtx_REG (DFmode, FP_ARG_FIRST + info.reg_offset + i);
+	      else
+		reg = gen_rtx_REG (DImode, GP_ARG_FIRST + info.reg_offset + i);
+
+	      XVECEXP (ret, 0, i)
+		= gen_rtx_EXPR_LIST (VOIDmode, reg,
+				     GEN_INT (bitpos / BITS_PER_UNIT));
+
+	      bitpos += BITS_PER_WORD;
+	    }
+	  return ret;
+	}
+    }
+
+  /* Handle the n32/n64 conventions for passing complex floating-point
+     arguments in FPR pairs.  The real part goes in the lower register
+     and the imaginary part goes in the upper register.  */
+  if (info.fpr_p
+      && GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
+    {
+      rtx real, imag;
+      enum machine_mode inner;
+      unsigned int regno;
+
+      inner = GET_MODE_INNER (mode);
+      regno = FP_ARG_FIRST + info.reg_offset;
+      if (info.reg_words * UNITS_PER_WORD == GET_MODE_SIZE (inner))
+	{
+	  /* Real part in registers, imaginary part on stack.  */
+	  gcc_assert (info.stack_words == info.reg_words);
+	  return gen_rtx_REG (inner, regno);
+	}
+      else
+	{
+	  gcc_assert (info.stack_words == 0);
+	  real = gen_rtx_EXPR_LIST (VOIDmode,
+				    gen_rtx_REG (inner, regno),
+				    const0_rtx);
+	  imag = gen_rtx_EXPR_LIST (VOIDmode,
+				    gen_rtx_REG (inner,
+						 regno + info.reg_words / 2),
+				    GEN_INT (GET_MODE_SIZE (inner)));
+	  return gen_rtx_PARALLEL (mode, gen_rtvec (2, real, imag));
+	}
+    }
+
+  return gen_rtx_REG (mode, riscv_arg_regno (&info, TARGET_HARD_FLOAT));
+}
+
+/* Implement TARGET_FUNCTION_ARG_ADVANCE.  */
+
+static void
+riscv_function_arg_advance (cumulative_args_t cum_v, enum machine_mode mode,
+			    const_tree type, bool named)
+{
+  CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
+  struct riscv_arg_info info;
+
+  riscv_get_arg_info (&info, cum, mode, type, named);
+
+  /* Advance the register count.  This has the effect of setting
+     num_gprs to MAX_ARGS_IN_REGISTERS if a doubleword-aligned
+     argument required us to skip the final GPR and pass the whole
+     argument on the stack.  */
+  cum->num_gprs = info.reg_offset + info.reg_words;
+
+  /* Advance the stack word count.  */
+  if (info.stack_words > 0)
+    cum->stack_words = info.stack_offset + info.stack_words;
+}
+
+/* Implement TARGET_ARG_PARTIAL_BYTES.  */
+
+static int
+riscv_arg_partial_bytes (cumulative_args_t cum,
+			 enum machine_mode mode, tree type, bool named)
+{
+  struct riscv_arg_info info;
+
+  riscv_get_arg_info (&info, get_cumulative_args (cum), mode, type, named);
+  return info.stack_words > 0 ? info.reg_words * UNITS_PER_WORD : 0;
+}
+
+/* See whether VALTYPE is a record whose fields should be returned in
+   floating-point registers.  If so, return the number of fields and
+   list them in FIELDS (which should have two elements).  Return 0
+   otherwise.
+
+   For n32 & n64, a structure with one or two fields is returned in
+   floating-point registers as long as every field has a floating-point
+   type.  */
+
+static int
+riscv_fpr_return_fields (const_tree valtype, tree *fields)
+{
+  tree field;
+  int i;
+
+  if (TREE_CODE (valtype) != RECORD_TYPE)
+    return 0;
+
+  i = 0;
+  for (field = TYPE_FIELDS (valtype); field != 0; field = DECL_CHAIN (field))
+    {
+      if (TREE_CODE (field) != FIELD_DECL)
+	continue;
+
+      if (!SCALAR_FLOAT_TYPE_P (TREE_TYPE (field)))
+	return 0;
+
+      if (i == 2)
+	return 0;
+
+      fields[i++] = field;
+    }
+  return i;
+}
+
+/* Return true if the function return value MODE will get returned in a
+   floating-point register.  */
+
+static bool
+riscv_return_mode_in_fpr_p (enum machine_mode mode)
+{
+  return ((GET_MODE_CLASS (mode) == MODE_FLOAT
+	   || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT
+	   || GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
+	  && GET_MODE_UNIT_SIZE (mode) <= UNITS_PER_HWFPVALUE);
+}
+
+/* Return the representation of an FPR return register when the
+   value being returned in FP_RETURN has mode VALUE_MODE and the
+   return type itself has mode TYPE_MODE.  On NewABI targets,
+   the two modes may be different for structures like:
+
+       struct __attribute__((packed)) foo { float f; }
+
+   where we return the SFmode value of "f" in FP_RETURN, but where
+   the structure itself has mode BLKmode.  */
+
+static rtx
+riscv_return_fpr_single (enum machine_mode type_mode,
+			enum machine_mode value_mode)
+{
+  rtx x;
+
+  x = gen_rtx_REG (value_mode, FP_RETURN);
+  if (type_mode != value_mode)
+    {
+      x = gen_rtx_EXPR_LIST (VOIDmode, x, const0_rtx);
+      x = gen_rtx_PARALLEL (type_mode, gen_rtvec (1, x));
+    }
+  return x;
+}
+
+/* Return a composite value in a pair of floating-point registers.
+   MODE1 and OFFSET1 are the mode and byte offset for the first value,
+   likewise MODE2 and OFFSET2 for the second.  MODE is the mode of the
+   complete value.
+
+   For n32 & n64, $f0 always holds the first value and $f2 the second.
+   Otherwise the values are packed together as closely as possible.  */
+
+static rtx
+riscv_return_fpr_pair (enum machine_mode mode,
+		      enum machine_mode mode1, HOST_WIDE_INT offset1,
+		      enum machine_mode mode2, HOST_WIDE_INT offset2)
+{
+  return gen_rtx_PARALLEL
+    (mode,
+     gen_rtvec (2,
+		gen_rtx_EXPR_LIST (VOIDmode,
+				   gen_rtx_REG (mode1, FP_RETURN),
+				   GEN_INT (offset1)),
+		gen_rtx_EXPR_LIST (VOIDmode,
+				   gen_rtx_REG (mode2, FP_RETURN + 1),
+				   GEN_INT (offset2))));
+
+}
+
+/* Implement FUNCTION_VALUE and LIBCALL_VALUE.  For normal calls,
+   VALTYPE is the return type and MODE is VOIDmode.  For libcalls,
+   VALTYPE is null and MODE is the mode of the return value.  */
+
+rtx
+riscv_function_value (const_tree valtype, const_tree func, enum machine_mode mode)
+{
+  if (valtype)
+    {
+      tree fields[2];
+      int unsigned_p;
+
+      mode = TYPE_MODE (valtype);
+      unsigned_p = TYPE_UNSIGNED (valtype);
+
+      /* Since TARGET_PROMOTE_FUNCTION_MODE unconditionally promotes,
+	 return values, promote the mode here too.  */
+      mode = promote_function_mode (valtype, mode, &unsigned_p, func, 1);
+
+      /* Handle structures whose fields are returned in $f0/$f2.  */
+      switch (riscv_fpr_return_fields (valtype, fields))
+	{
+	case 1:
+	  return riscv_return_fpr_single (mode,
+					 TYPE_MODE (TREE_TYPE (fields[0])));
+
+	case 2:
+	  return riscv_return_fpr_pair (mode,
+				       TYPE_MODE (TREE_TYPE (fields[0])),
+				       int_byte_position (fields[0]),
+				       TYPE_MODE (TREE_TYPE (fields[1])),
+				       int_byte_position (fields[1]));
+	}
+
+      /* Only use FPRs for scalar, complex or vector types.  */
+      if (!FLOAT_TYPE_P (valtype))
+	return gen_rtx_REG (mode, GP_RETURN);
+    }
+
+  /* Handle long doubles for n32 & n64.  */
+  if (mode == TFmode)
+    return riscv_return_fpr_pair (mode,
+    			     DImode, 0,
+    			     DImode, GET_MODE_SIZE (mode) / 2);
+
+  if (riscv_return_mode_in_fpr_p (mode))
+    {
+      if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
+        return riscv_return_fpr_pair (mode,
+    				 GET_MODE_INNER (mode), 0,
+    				 GET_MODE_INNER (mode),
+    				 GET_MODE_SIZE (mode) / 2);
+      else
+        return gen_rtx_REG (mode, FP_RETURN);
+    }
+
+  return gen_rtx_REG (mode, GP_RETURN);
+}
+
+/* Implement TARGET_RETURN_IN_MEMORY.  Scalars and small structures
+   that fit in two registers are returned in a0/a1. */
+
+static bool
+riscv_return_in_memory (const_tree type, const_tree fndecl ATTRIBUTE_UNUSED)
+{
+  return !IN_RANGE (int_size_in_bytes (type), 0, 2 * UNITS_PER_WORD);
+}
+
+/* Implement TARGET_PASS_BY_REFERENCE. */
+
+static bool
+riscv_pass_by_reference (cumulative_args_t cum ATTRIBUTE_UNUSED,
+			 enum machine_mode mode, const_tree type,
+			 bool named ATTRIBUTE_UNUSED)
+{
+  if (type && riscv_return_in_memory (type, NULL_TREE))
+    return true;
+  return targetm.calls.must_pass_in_stack (mode, type);
+}
+
+/* Implement TARGET_SETUP_INCOMING_VARARGS.  */
+
+static void
+riscv_setup_incoming_varargs (cumulative_args_t cum, enum machine_mode mode,
+			     tree type, int *pretend_size ATTRIBUTE_UNUSED,
+			     int no_rtl)
+{
+  CUMULATIVE_ARGS local_cum;
+  int gp_saved;
+
+  /* The caller has advanced CUM up to, but not beyond, the last named
+     argument.  Advance a local copy of CUM past the last "real" named
+     argument, to find out how many registers are left over.  */
+  local_cum = *get_cumulative_args (cum);
+  riscv_function_arg_advance (pack_cumulative_args (&local_cum), mode, type, 1);
+
+  /* Found out how many registers we need to save.  */
+  gp_saved = MAX_ARGS_IN_REGISTERS - local_cum.num_gprs;
+
+  if (!no_rtl && gp_saved > 0)
+    {
+      rtx ptr, mem;
+
+      ptr = plus_constant (Pmode, virtual_incoming_args_rtx,
+			   REG_PARM_STACK_SPACE (cfun->decl)
+			   - gp_saved * UNITS_PER_WORD);
+      mem = gen_frame_mem (BLKmode, ptr);
+      set_mem_alias_set (mem, get_varargs_alias_set ());
+
+      move_block_from_reg (local_cum.num_gprs + GP_ARG_FIRST,
+			   mem, gp_saved);
+    }
+  if (REG_PARM_STACK_SPACE (cfun->decl) == 0)
+    cfun->machine->varargs_size = gp_saved * UNITS_PER_WORD;
+}
+
+/* Implement TARGET_EXPAND_BUILTIN_VA_START.  */
+
+static void
+riscv_va_start (tree valist, rtx nextarg)
+{
+  nextarg = plus_constant (Pmode, nextarg, -cfun->machine->varargs_size);
+  std_expand_builtin_va_start (valist, nextarg);
+}
+
+/* Expand a call of type TYPE.  RESULT is where the result will go (null
+   for "call"s and "sibcall"s), ADDR is the address of the function,
+   ARGS_SIZE is the size of the arguments and AUX is the value passed
+   to us by riscv_function_arg.  Return the call itself.  */
+
+rtx
+riscv_expand_call (bool sibcall_p, rtx result, rtx addr, rtx args_size)
+{
+  rtx pattern;
+
+  if (!call_insn_operand (addr, VOIDmode))
+    {
+      rtx reg = RISCV_PROLOGUE_TEMP (Pmode);
+      riscv_emit_move (reg, addr);
+      addr = reg;
+    }
+
+  if (result == 0)
+    {
+      rtx (*fn) (rtx, rtx);
+
+      if (sibcall_p)
+	fn = gen_sibcall_internal;
+      else
+	fn = gen_call_internal;
+
+      pattern = fn (addr, args_size);
+    }
+  else if (GET_CODE (result) == PARALLEL && XVECLEN (result, 0) == 2)
+    {
+      /* Handle return values created by riscv_return_fpr_pair.  */
+      rtx (*fn) (rtx, rtx, rtx, rtx);
+      rtx reg1, reg2;
+
+      if (sibcall_p)
+	fn = gen_sibcall_value_multiple_internal;
+      else
+	fn = gen_call_value_multiple_internal;
+
+      reg1 = XEXP (XVECEXP (result, 0, 0), 0);
+      reg2 = XEXP (XVECEXP (result, 0, 1), 0);
+      pattern = fn (reg1, addr, args_size, reg2);
+    }
+  else
+    {
+      rtx (*fn) (rtx, rtx, rtx);
+
+      if (sibcall_p)
+	fn = gen_sibcall_value_internal;
+      else
+	fn = gen_call_value_internal;
+
+      /* Handle return values created by riscv_return_fpr_single.  */
+      if (GET_CODE (result) == PARALLEL && XVECLEN (result, 0) == 1)
+	result = XEXP (XVECEXP (result, 0, 0), 0);
+      pattern = fn (result, addr, args_size);
+    }
+
+  return emit_call_insn (pattern);
+}
+
+/* Emit straight-line code to move LENGTH bytes from SRC to DEST.
+   Assume that the areas do not overlap.  */
+
+static void
+riscv_block_move_straight (rtx dest, rtx src, HOST_WIDE_INT length)
+{
+  HOST_WIDE_INT offset, delta;
+  unsigned HOST_WIDE_INT bits;
+  int i;
+  enum machine_mode mode;
+  rtx *regs;
+
+  bits = MAX( BITS_PER_UNIT,
+             MIN( BITS_PER_WORD, MIN( MEM_ALIGN(src),MEM_ALIGN(dest) ) ) );
+
+  mode = mode_for_size (bits, MODE_INT, 0);
+  delta = bits / BITS_PER_UNIT;
+
+  /* Allocate a buffer for the temporary registers.  */
+  regs = XALLOCAVEC (rtx, length / delta);
+
+  /* Load as many BITS-sized chunks as possible.  Use a normal load if
+     the source has enough alignment, otherwise use left/right pairs.  */
+  for (offset = 0, i = 0; offset + delta <= length; offset += delta, i++)
+    {
+      regs[i] = gen_reg_rtx (mode);
+	riscv_emit_move (regs[i], adjust_address (src, mode, offset));
+    }
+
+  /* Copy the chunks to the destination.  */
+  for (offset = 0, i = 0; offset + delta <= length; offset += delta, i++)
+      riscv_emit_move (adjust_address (dest, mode, offset), regs[i]);
+
+  /* Mop up any left-over bytes.  */
+  if (offset < length)
+    {
+      src = adjust_address (src, BLKmode, offset);
+      dest = adjust_address (dest, BLKmode, offset);
+      move_by_pieces (dest, src, length - offset,
+		      MIN (MEM_ALIGN (src), MEM_ALIGN (dest)), 0);
+    }
+}
+
+/* Helper function for doing a loop-based block operation on memory
+   reference MEM.  Each iteration of the loop will operate on LENGTH
+   bytes of MEM.
+
+   Create a new base register for use within the loop and point it to
+   the start of MEM.  Create a new memory reference that uses this
+   register.  Store them in *LOOP_REG and *LOOP_MEM respectively.  */
+
+static void
+riscv_adjust_block_mem (rtx mem, HOST_WIDE_INT length,
+		       rtx *loop_reg, rtx *loop_mem)
+{
+  *loop_reg = copy_addr_to_reg (XEXP (mem, 0));
+
+  /* Although the new mem does not refer to a known location,
+     it does keep up to LENGTH bytes of alignment.  */
+  *loop_mem = change_address (mem, BLKmode, *loop_reg);
+  set_mem_align (*loop_mem, MIN (MEM_ALIGN (mem), length * BITS_PER_UNIT));
+}
+
+/* Move LENGTH bytes from SRC to DEST using a loop that moves BYTES_PER_ITER
+   bytes at a time.  LENGTH must be at least BYTES_PER_ITER.  Assume that
+   the memory regions do not overlap.  */
+
+static void
+riscv_block_move_loop (rtx dest, rtx src, HOST_WIDE_INT length,
+		      HOST_WIDE_INT bytes_per_iter)
+{
+  rtx label, src_reg, dest_reg, final_src, test;
+  HOST_WIDE_INT leftover;
+
+  leftover = length % bytes_per_iter;
+  length -= leftover;
+
+  /* Create registers and memory references for use within the loop.  */
+  riscv_adjust_block_mem (src, bytes_per_iter, &src_reg, &src);
+  riscv_adjust_block_mem (dest, bytes_per_iter, &dest_reg, &dest);
+
+  /* Calculate the value that SRC_REG should have after the last iteration
+     of the loop.  */
+  final_src = expand_simple_binop (Pmode, PLUS, src_reg, GEN_INT (length),
+				   0, 0, OPTAB_WIDEN);
+
+  /* Emit the start of the loop.  */
+  label = gen_label_rtx ();
+  emit_label (label);
+
+  /* Emit the loop body.  */
+  riscv_block_move_straight (dest, src, bytes_per_iter);
+
+  /* Move on to the next block.  */
+  riscv_emit_move (src_reg, plus_constant (Pmode, src_reg, bytes_per_iter));
+  riscv_emit_move (dest_reg, plus_constant (Pmode, dest_reg, bytes_per_iter));
+
+  /* Emit the loop condition.  */
+  test = gen_rtx_NE (VOIDmode, src_reg, final_src);
+  if (Pmode == DImode)
+    emit_jump_insn (gen_cbranchdi4 (test, src_reg, final_src, label));
+  else
+    emit_jump_insn (gen_cbranchsi4 (test, src_reg, final_src, label));
+
+  /* Mop up any left-over bytes.  */
+  if (leftover)
+    riscv_block_move_straight (dest, src, leftover);
+}
+
+/* Expand a movmemsi instruction, which copies LENGTH bytes from
+   memory reference SRC to memory reference DEST.  */
+
+bool
+riscv_expand_block_move (rtx dest, rtx src, rtx length)
+{
+  if (CONST_INT_P (length))
+    {
+      HOST_WIDE_INT factor, align;
+      
+      align = MIN (MIN (MEM_ALIGN (src), MEM_ALIGN (dest)), BITS_PER_WORD);
+      factor = BITS_PER_WORD / align;
+
+      if (INTVAL (length) <= RISCV_MAX_MOVE_BYTES_STRAIGHT / factor)
+	{
+	  riscv_block_move_straight (dest, src, INTVAL (length));
+	  return true;
+	}
+      else if (optimize && align >= BITS_PER_WORD)
+	{
+	  riscv_block_move_loop (dest, src, INTVAL (length),
+				RISCV_MAX_MOVE_BYTES_PER_LOOP_ITER / factor);
+	  return true;
+	}
+    }
+  return false;
+}
+
+/* (Re-)Initialize riscv_lo_relocs and riscv_hi_relocs.  */
+
+static void
+riscv_init_relocs (void)
+{
+  memset (riscv_hi_relocs, '\0', sizeof (riscv_hi_relocs));
+  memset (riscv_lo_relocs, '\0', sizeof (riscv_lo_relocs));
+
+  if (!flag_pic && riscv_cmodel == CM_MEDLOW)
+    {
+      riscv_hi_relocs[SYMBOL_ABSOLUTE] = "%hi(";
+      riscv_lo_relocs[SYMBOL_ABSOLUTE] = "%lo(";
+    }
+
+  if (!flag_pic || flag_pie)
+    {
+      riscv_hi_relocs[SYMBOL_TLS_LE] = "%tprel_hi(";
+      riscv_lo_relocs[SYMBOL_TLS_LE] = "%tprel_lo(";
+    }
+}
+
+/* Print symbolic operand OP, which is part of a HIGH or LO_SUM
+   in context CONTEXT.  RELOCS is the array of relocations to use.  */
+
+static void
+riscv_print_operand_reloc (FILE *file, rtx op, const char **relocs)
+{
+  enum riscv_symbol_type symbol_type;
+  const char *p;
+
+  symbol_type = riscv_classify_symbolic_expression (op);
+  gcc_assert (relocs[symbol_type]);
+
+  fputs (relocs[symbol_type], file);
+  output_addr_const (file, riscv_strip_unspec_address (op));
+  for (p = relocs[symbol_type]; *p != 0; p++)
+    if (*p == '(')
+      fputc (')', file);
+}
+
+static const char *
+riscv_memory_model_suffix (enum memmodel model)
+{
+  switch (model)
+    {
+      case MEMMODEL_ACQ_REL:
+      case MEMMODEL_SEQ_CST:
+      case MEMMODEL_SYNC_SEQ_CST:
+	return ".sc";
+      case MEMMODEL_ACQUIRE:
+      case MEMMODEL_CONSUME:
+      case MEMMODEL_SYNC_ACQUIRE:
+	return ".aq";
+      case MEMMODEL_RELEASE:
+      case MEMMODEL_SYNC_RELEASE:
+	return ".rl";
+      case MEMMODEL_RELAXED:
+	return "";
+      default:
+        fprintf(stderr, "riscv_memory_model_suffix(%ld)\n", model);
+        gcc_unreachable();
+    }
+}
+
+/* Implement TARGET_PRINT_OPERAND.  The RISCV-specific operand codes are:
+
+   'h'	Print the high-part relocation associated with OP, after stripping
+	  any outermost HIGH.
+   'R'	Print the low-part relocation associated with OP.
+   'C'	Print the integer branch condition for comparison OP.
+   'A'	Print the atomic operation suffix for memory model OP.
+   'z'	Print $0 if OP is zero, otherwise print OP normally.  */
+
+static void
+riscv_print_operand (FILE *file, rtx op, int letter)
+{
+  enum rtx_code code;
+
+  gcc_assert (op);
+  code = GET_CODE (op);
+
+  switch (letter)
+    {
+    case 'h':
+      if (code == HIGH)
+	op = XEXP (op, 0);
+      riscv_print_operand_reloc (file, op, riscv_hi_relocs);
+      break;
+
+    case 'R':
+      riscv_print_operand_reloc (file, op, riscv_lo_relocs);
+      break;
+
+    case 'C':
+      /* The RTL names match the instruction names. */
+      fputs (GET_RTX_NAME (code), file);
+      break;
+
+    case 'A':
+      fputs (riscv_memory_model_suffix ((enum memmodel)INTVAL (op)), file);
+      break;
+
+    default:
+      switch (code)
+	{
+	case REG:
+	  if (letter && letter != 'z')
+	    output_operand_lossage ("invalid use of '%%%c'", letter);
+	  fprintf (file, "%s", reg_names[REGNO (op)]);
+	  break;
+
+	case MEM:
+	  if (letter == 'y')
+	    fprintf (file, "%s", reg_names[REGNO(XEXP(op, 0))]);
+	  else if (letter && letter != 'z')
+	    output_operand_lossage ("invalid use of '%%%c'", letter);
+	  else
+	    output_address (XEXP (op, 0));
+	  break;
+
+	default:
+	  if (letter == 'z' && op == CONST0_RTX (GET_MODE (op)))
+	    fputs (reg_names[GP_REG_FIRST], file);
+	  else if (letter && letter != 'z')
+	    output_operand_lossage ("invalid use of '%%%c'", letter);
+	  else
+	    output_addr_const (file, riscv_strip_unspec_address (op));
+	  break;
+	}
+    }
+}
+
+/* Implement TARGET_PRINT_OPERAND_ADDRESS.  */
+
+static void
+riscv_print_operand_address (FILE *file, rtx x)
+{
+  struct riscv_address_info addr;
+
+  if (riscv_classify_address (&addr, x, word_mode, true))
+    switch (addr.type)
+      {
+      case ADDRESS_REG:
+	riscv_print_operand (file, addr.offset, 0);
+	fprintf (file, "(%s)", reg_names[REGNO (addr.reg)]);
+	return;
+
+      case ADDRESS_LO_SUM:
+	riscv_print_operand_reloc (file, addr.offset, riscv_lo_relocs);
+	fprintf (file, "(%s)", reg_names[REGNO (addr.reg)]);
+	return;
+
+      case ADDRESS_CONST_INT:
+	output_addr_const (file, x);
+	fprintf (file, "(%s)", reg_names[GP_REG_FIRST]);
+	return;
+
+      case ADDRESS_SYMBOLIC:
+	output_addr_const (file, riscv_strip_unspec_address (x));
+	return;
+      }
+  gcc_unreachable ();
+}
+
+static bool
+riscv_size_ok_for_small_data_p (int size)
+{
+  return g_switch_value && IN_RANGE (size, 1, g_switch_value);
+}
+
+/* Return true if EXP should be placed in the small data section. */
+
+static bool
+riscv_in_small_data_p (const_tree x)
+{
+  if (TREE_CODE (x) == STRING_CST || TREE_CODE (x) == FUNCTION_DECL)
+    return false;
+
+  if (TREE_CODE (x) == VAR_DECL && DECL_SECTION_NAME (x))
+    {
+      const char *sec = DECL_SECTION_NAME (x);
+      return strcmp (sec, ".sdata") == 0 || strcmp (sec, ".sbss") == 0;
+    }
+
+  return riscv_size_ok_for_small_data_p (int_size_in_bytes (TREE_TYPE (x)));
+}
+
+/* Return a section for X, handling small data. */
+
+static section *
+riscv_elf_select_rtx_section (enum machine_mode mode, rtx x,
+			      unsigned HOST_WIDE_INT align)
+{
+  section *s = default_elf_select_rtx_section (mode, x, align);
+
+  if (riscv_size_ok_for_small_data_p (GET_MODE_SIZE (mode)))
+    {
+      if (strncmp (s->named.name, ".rodata.cst", strlen (".rodata.cst")) == 0)
+	{
+	  /* Rename .rodata.cst* to .srodata.cst*. */
+	  char *name = (char *) alloca (strlen (s->named.name) + 2);
+	  sprintf (name, ".s%s", s->named.name + 1);
+	  return get_section (name, s->named.common.flags, NULL);
+	}
+
+      if (s == data_section)
+	return sdata_section;
+    }
+
+  return s;
+}
+
+/* Implement TARGET_ASM_OUTPUT_DWARF_DTPREL.  */
+
+static void ATTRIBUTE_UNUSED
+riscv_output_dwarf_dtprel (FILE *file, int size, rtx x)
+{
+  switch (size)
+    {
+    case 4:
+      fputs ("\t.dtprelword\t", file);
+      break;
+
+    case 8:
+      fputs ("\t.dtpreldword\t", file);
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+  output_addr_const (file, x);
+  fputs ("+0x800", file);
+}
+
+/* Make the last instruction frame-related and note that it performs
+   the operation described by FRAME_PATTERN.  */
+
+static void
+riscv_set_frame_expr (rtx frame_pattern)
+{
+  rtx insn;
+
+  insn = get_last_insn ();
+  RTX_FRAME_RELATED_P (insn) = 1;
+  REG_NOTES (insn) = alloc_EXPR_LIST (REG_FRAME_RELATED_EXPR,
+				      frame_pattern,
+				      REG_NOTES (insn));
+}
+
+/* Return a frame-related rtx that stores REG at MEM.
+   REG must be a single register.  */
+
+static rtx
+riscv_frame_set (rtx mem, rtx reg)
+{
+  rtx set;
+
+  set = gen_rtx_SET (VOIDmode, mem, reg);
+  RTX_FRAME_RELATED_P (set) = 1;
+
+  return set;
+}
+
+/* Return true if the current function must save register REGNO.  */
+
+static bool
+riscv_save_reg_p (unsigned int regno)
+{
+  bool call_saved = !global_regs[regno] && !call_really_used_regs[regno];
+  bool might_clobber = crtl->saves_all_registers
+		       || df_regs_ever_live_p (regno)
+		       || (regno == HARD_FRAME_POINTER_REGNUM
+			   && frame_pointer_needed);
+
+  return (call_saved && might_clobber)
+	 || (regno == RETURN_ADDR_REGNUM && crtl->calls_eh_return);
+}
+
+/* Determine whether to call GPR save/restore routines.  */
+static bool
+riscv_use_save_libcall (const struct riscv_frame_info *frame)
+{
+  if (!TARGET_SAVE_RESTORE || crtl->calls_eh_return || frame_pointer_needed)
+    return false;
+
+  return frame->save_libcall_adjustment != 0;
+}
+
+/* Determine which GPR save/restore routine to call.  */
+
+static unsigned
+riscv_save_libcall_count (unsigned mask)
+{
+  for (unsigned n = GP_REG_LAST; n > GP_REG_FIRST; n--)
+    if (BITSET_P (mask, n))
+      return CALLEE_SAVED_REG_NUMBER (n) + 1;
+  abort ();
+}
+
+/* Populate the current function's riscv_frame_info structure.
+
+   RISC-V stack frames grown downward.  High addresses are at the top.
+
+	+-------------------------------+
+	|                               |
+	|  incoming stack arguments     |
+	|                               |
+	+-------------------------------+ <-- incoming stack pointer
+	|                               |
+	|  callee-allocated save area   |
+	|  for arguments that are       |
+	|  split between registers and  |
+	|  the stack                    |
+	|                               |
+	+-------------------------------+ <-- arg_pointer_rtx
+	|                               |
+	|  callee-allocated save area   |
+	|  for register varargs         |
+	|                               |
+	+-------------------------------+ <-- hard_frame_pointer_rtx;
+	|                               |     stack_pointer_rtx + gp_sp_offset
+	|  GPR save area                |       + UNITS_PER_WORD
+	|                               |
+	+-------------------------------+ <-- stack_pointer_rtx + fp_sp_offset
+	|                               |       + UNITS_PER_HWVALUE
+	|  FPR save area                |
+	|                               |
+	+-------------------------------+ <-- frame_pointer_rtx (virtual)
+	|                               |
+	|  local variables              |
+	|                               |
+      P +-------------------------------+
+	|                               |
+	|  outgoing stack arguments     |
+	|                               |
+	+-------------------------------+ <-- stack_pointer_rtx
+
+   Dynamic stack allocations such as alloca insert data at point P.
+   They decrease stack_pointer_rtx but leave frame_pointer_rtx and
+   hard_frame_pointer_rtx unchanged.  */
+
+static void
+riscv_compute_frame_info (void)
+{
+  struct riscv_frame_info *frame;
+  HOST_WIDE_INT offset;
+  unsigned int regno, i, num_x_saved = 0, num_f_saved = 0;
+
+  frame = &cfun->machine->frame;
+  memset (frame, 0, sizeof (*frame));
+
+  /* Find out which GPRs we need to save.  */
+  for (regno = GP_REG_FIRST; regno <= GP_REG_LAST; regno++)
+    if (riscv_save_reg_p (regno))
+      frame->mask |= 1 << (regno - GP_REG_FIRST), num_x_saved++;
+
+  /* If this function calls eh_return, we must also save and restore the
+     EH data registers.  */
+  if (crtl->calls_eh_return)
+    for (i = 0; (regno = EH_RETURN_DATA_REGNO (i)) != INVALID_REGNUM; i++)
+      frame->mask |= 1 << (regno - GP_REG_FIRST), num_x_saved++;
+
+  /* Find out which FPRs we need to save.  This loop must iterate over
+     the same space as its companion in riscv_for_each_saved_reg.  */
+  if (TARGET_HARD_FLOAT)
+    for (regno = FP_REG_FIRST; regno <= FP_REG_LAST; regno++)
+      if (riscv_save_reg_p (regno))
+        frame->fmask |= 1 << (regno - FP_REG_FIRST), num_f_saved++;
+
+  /* At the bottom of the frame are any outgoing stack arguments. */
+  offset = crtl->outgoing_args_size;
+  /* Next are local stack variables. */
+  offset += RISCV_STACK_ALIGN (get_frame_size ());
+  /* The virtual frame pointer points above the local variables. */
+  frame->frame_pointer_offset = offset;
+  /* Next are the callee-saved FPRs. */
+  if (frame->fmask)
+    {
+      offset += RISCV_STACK_ALIGN (num_f_saved * UNITS_PER_FPREG);
+      frame->fp_sp_offset = offset - UNITS_PER_HWFPVALUE;
+    }
+  /* Next are the callee-saved GPRs. */
+  if (frame->mask)
+    {
+      unsigned x_save_size = RISCV_STACK_ALIGN (num_x_saved * UNITS_PER_WORD);
+      unsigned num_save_restore = 1 + riscv_save_libcall_count (frame->mask);
+
+      /* Only use save/restore routines if they don't alter the stack size.  */
+      if (RISCV_STACK_ALIGN (num_save_restore * UNITS_PER_WORD) == x_save_size)
+	frame->save_libcall_adjustment = x_save_size;
+
+      offset += x_save_size;
+      frame->gp_sp_offset = offset - UNITS_PER_WORD;
+    }
+  /* The hard frame pointer points above the callee-saved GPRs. */
+  frame->hard_frame_pointer_offset = offset;
+  /* Above the hard frame pointer is the callee-allocated varags save area. */
+  offset += RISCV_STACK_ALIGN (cfun->machine->varargs_size);
+  frame->arg_pointer_offset = offset;
+  /* Next is the callee-allocated area for pretend stack arguments.  */
+  offset += crtl->args.pretend_args_size;
+  frame->total_size = offset;
+  /* Next points the incoming stack pointer and any incoming arguments. */
+
+  /* Only use save/restore routines when the GPRs are atop the frame.  */
+  if (frame->hard_frame_pointer_offset != frame->total_size)
+    frame->save_libcall_adjustment = 0;
+}
+
+/* Make sure that we're not trying to eliminate to the wrong hard frame
+   pointer.  */
+
+static bool
+riscv_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
+{
+  return (to == HARD_FRAME_POINTER_REGNUM || to == STACK_POINTER_REGNUM);
+}
+
+/* Implement INITIAL_ELIMINATION_OFFSET.  FROM is either the frame pointer
+   or argument pointer.  TO is either the stack pointer or hard frame
+   pointer.  */
+
+HOST_WIDE_INT
+riscv_initial_elimination_offset (int from, int to)
+{
+  HOST_WIDE_INT src, dest;
+
+  riscv_compute_frame_info ();
+
+  if (to == HARD_FRAME_POINTER_REGNUM)
+    dest = cfun->machine->frame.hard_frame_pointer_offset;
+  else if (to == STACK_POINTER_REGNUM)
+    dest = 0; /* this is the base of all offsets */
+  else
+    gcc_unreachable ();
+
+  if (from == FRAME_POINTER_REGNUM)
+    src = cfun->machine->frame.frame_pointer_offset;
+  else if (from == ARG_POINTER_REGNUM)
+    src = cfun->machine->frame.arg_pointer_offset;
+  else
+    gcc_unreachable ();
+
+  return src - dest;
+}
+
+/* Implement RETURN_ADDR_RTX.  We do not support moving back to a
+   previous frame.  */
+
+rtx
+riscv_return_addr (int count, rtx frame ATTRIBUTE_UNUSED)
+{
+  if (count != 0)
+    return const0_rtx;
+
+  return get_hard_reg_initial_val (Pmode, RETURN_ADDR_REGNUM);
+}
+
+/* Emit code to change the current function's return address to
+   ADDRESS.  SCRATCH is available as a scratch register, if needed.
+   ADDRESS and SCRATCH are both word-mode GPRs.  */
+
+void
+riscv_set_return_address (rtx address, rtx scratch)
+{
+  rtx slot_address;
+
+  gcc_assert (BITSET_P (cfun->machine->frame.mask, RETURN_ADDR_REGNUM));
+  slot_address = riscv_add_offset (scratch, stack_pointer_rtx,
+				  cfun->machine->frame.gp_sp_offset);
+  riscv_emit_move (gen_frame_mem (GET_MODE (address), slot_address), address);
+}
+
+/* A function to save or store a register.  The first argument is the
+   register and the second is the stack slot.  */
+typedef void (*riscv_save_restore_fn) (rtx, rtx);
+
+/* Use FN to save or restore register REGNO.  MODE is the register's
+   mode and OFFSET is the offset of its save slot from the current
+   stack pointer.  */
+
+static void
+riscv_save_restore_reg (enum machine_mode mode, int regno,
+		       HOST_WIDE_INT offset, riscv_save_restore_fn fn)
+{
+  rtx mem;
+
+  mem = gen_frame_mem (mode, plus_constant (Pmode, stack_pointer_rtx, offset));
+  fn (gen_rtx_REG (mode, regno), mem);
+}
+
+/* Call FN for each register that is saved by the current function.
+   SP_OFFSET is the offset of the current stack pointer from the start
+   of the frame.  */
+
+static void
+riscv_for_each_saved_reg (HOST_WIDE_INT sp_offset, riscv_save_restore_fn fn)
+{
+  HOST_WIDE_INT offset;
+  int regno;
+
+  /* Save the link register and s-registers. */
+  offset = cfun->machine->frame.gp_sp_offset - sp_offset;
+  for (regno = GP_REG_FIRST; regno <= GP_REG_LAST-1; regno++)
+    if (BITSET_P (cfun->machine->frame.mask, regno - GP_REG_FIRST))
+      {
+        riscv_save_restore_reg (word_mode, regno, offset, fn);
+        offset -= UNITS_PER_WORD;
+      }
+
+  /* This loop must iterate over the same space as its companion in
+     riscv_compute_frame_info.  */
+  offset = cfun->machine->frame.fp_sp_offset - sp_offset;
+  for (regno = FP_REG_FIRST; regno <= FP_REG_LAST; regno++)
+    if (BITSET_P (cfun->machine->frame.fmask, regno - FP_REG_FIRST))
+      {
+	riscv_save_restore_reg (DFmode, regno, offset, fn);
+	offset -= GET_MODE_SIZE (DFmode);
+      }
+}
+
+/* Save register REG to MEM.  Make the instruction frame-related.  */
+
+static void
+riscv_save_reg (rtx reg, rtx mem)
+{
+  riscv_emit_move (mem, reg);
+  riscv_set_frame_expr (riscv_frame_set (mem, reg));
+}
+
+/* Restore register REG from MEM.  */
+
+static void
+riscv_restore_reg (rtx reg, rtx mem)
+{
+  riscv_emit_move (reg, mem);
+}
+
+/* Return the code to invoke the GPR save routine.  */
+
+const char *
+riscv_output_gpr_save (unsigned mask)
+{
+  static char buf[GP_REG_NUM * 32];
+  size_t len = 0;
+  unsigned n = riscv_save_libcall_count (mask), i;
+  unsigned frame_size = RISCV_STACK_ALIGN ((n + 1) * UNITS_PER_WORD);
+
+  len += sprintf (buf + len, "call\tt0,__riscv_save_%u", n);
+
+#ifdef DWARF2_UNWIND_INFO
+  /* Describe the effect of the call to __riscv_save_X.  */
+  if (dwarf2out_do_cfi_asm ())
+    {
+      len += sprintf (buf + len, "\n\t.cfi_def_cfa_offset %u", frame_size);
+
+      for (i = GP_REG_FIRST; i <= GP_REG_LAST; i++)
+	if (BITSET_P (cfun->machine->frame.mask, i))
+	  len += sprintf (buf + len, "\n\t.cfi_offset %u,%d", i,
+			  (CALLEE_SAVED_REG_NUMBER (i) + 2) * -UNITS_PER_WORD);
+    }
+#endif
+
+  return buf;
+}
+
+/* Expand the "prologue" pattern.  */
+
+void
+riscv_expand_prologue (void)
+{
+  struct riscv_frame_info *frame = &cfun->machine->frame;
+  HOST_WIDE_INT size = frame->total_size;
+  unsigned mask = frame->mask;
+  rtx insn;
+
+  if (flag_stack_usage_info)
+    current_function_static_stack_size = size;
+
+  /* When optimizing for size, call a subroutine to save the registers.  */
+  if (riscv_use_save_libcall (frame))
+    {
+      frame->mask = 0; /* Temporarily fib that we need not save GPRs.  */
+      size -= frame->save_libcall_adjustment;
+      emit_insn (gen_gpr_save (GEN_INT (mask)));
+    }
+
+  /* Save the registers.  Allocate up to RISCV_MAX_FIRST_STACK_STEP
+     bytes beforehand; this is enough to cover the register save area
+     without going out of range.  */
+  if ((frame->mask | frame->fmask) != 0)
+    {
+      HOST_WIDE_INT step1;
+
+      step1 = MIN (size, RISCV_MAX_FIRST_STACK_STEP);
+      insn = gen_add3_insn (stack_pointer_rtx,
+			    stack_pointer_rtx,
+			    GEN_INT (-step1));
+      RTX_FRAME_RELATED_P (emit_insn (insn)) = 1;
+      size -= step1;
+      riscv_for_each_saved_reg (size, riscv_save_reg);
+    }
+
+  frame->mask = mask; /* Undo the above fib.  */
+
+  /* Set up the frame pointer, if we're using one.  */
+  if (frame_pointer_needed)
+    {
+      insn = gen_add3_insn (hard_frame_pointer_rtx, stack_pointer_rtx,
+                            GEN_INT (frame->hard_frame_pointer_offset - size));
+      RTX_FRAME_RELATED_P (emit_insn (insn)) = 1;
+    }
+
+  /* Allocate the rest of the frame.  */
+  if (size > 0)
+    {
+      if (SMALL_OPERAND (-size))
+	{
+	  insn = gen_add3_insn (stack_pointer_rtx, stack_pointer_rtx,
+				GEN_INT (-size));
+	  RTX_FRAME_RELATED_P (emit_insn (insn)) = 1;
+	}
+      else
+	{
+	  riscv_emit_move (RISCV_PROLOGUE_TEMP (Pmode), GEN_INT (-size));
+	  emit_insn (gen_add3_insn (stack_pointer_rtx,
+				    stack_pointer_rtx,
+				    RISCV_PROLOGUE_TEMP (Pmode)));
+
+	  /* Describe the effect of the previous instructions.  */
+	  insn = plus_constant (Pmode, stack_pointer_rtx, -size);
+	  insn = gen_rtx_SET (VOIDmode, stack_pointer_rtx, insn);
+	  riscv_set_frame_expr (insn);
+	}
+    }
+}
+
+/* Expand an "epilogue" or "sibcall_epilogue" pattern; SIBCALL_P
+   says which.  */
+
+void
+riscv_expand_epilogue (bool sibcall_p)
+{
+  /* Split the frame into two.  STEP1 is the amount of stack we should
+     deallocate before restoring the registers.  STEP2 is the amount we
+     should deallocate afterwards.
+
+     Start off by assuming that no registers need to be restored.  */
+  struct riscv_frame_info *frame = &cfun->machine->frame;
+  unsigned mask = frame->mask;
+  HOST_WIDE_INT step1 = frame->total_size;
+  HOST_WIDE_INT step2 = 0;
+  bool use_restore_libcall = !sibcall_p && riscv_use_save_libcall (frame);
+  rtx ra = gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM);
+
+  if (!sibcall_p && riscv_can_use_return_insn ())
+    {
+      emit_jump_insn (gen_return ());
+      return;
+    }
+
+  /* Move past any dynamic stack allocations.  */
+  if (cfun->calls_alloca)
+    {
+      rtx adjust = GEN_INT (-frame->hard_frame_pointer_offset);
+      if (!SMALL_OPERAND (INTVAL (adjust)))
+	{
+	  riscv_emit_move (RISCV_PROLOGUE_TEMP (Pmode), adjust);
+	  adjust = RISCV_PROLOGUE_TEMP (Pmode);
+	}
+
+      emit_insn (gen_add3_insn (stack_pointer_rtx, hard_frame_pointer_rtx,
+				adjust));
+    }
+
+  /* If we need to restore registers, deallocate as much stack as
+     possible in the second step without going out of range.  */
+  if ((frame->mask | frame->fmask) != 0)
+    {
+      step2 = MIN (step1, RISCV_MAX_FIRST_STACK_STEP);
+      step1 -= step2;
+    }
+
+  /* Set TARGET to BASE + STEP1.  */
+  if (step1 > 0)
+    {
+      /* Get an rtx for STEP1 that we can add to BASE.  */
+      rtx adjust = GEN_INT (step1);
+      if (!SMALL_OPERAND (step1))
+	{
+	  riscv_emit_move (RISCV_PROLOGUE_TEMP (Pmode), adjust);
+	  adjust = RISCV_PROLOGUE_TEMP (Pmode);
+	}
+
+      emit_insn (gen_add3_insn (stack_pointer_rtx, stack_pointer_rtx, adjust));
+    }
+
+  if (use_restore_libcall)
+    frame->mask = 0; /* Temporarily fib that we need not save GPRs.  */
+
+  /* Restore the registers.  */
+  riscv_for_each_saved_reg (frame->total_size - step2, riscv_restore_reg);
+
+  if (use_restore_libcall)
+    {
+      frame->mask = mask; /* Undo the above fib.  */
+      gcc_assert (step2 >= frame->save_libcall_adjustment);
+      step2 -= frame->save_libcall_adjustment;
+    }
+
+  /* Deallocate the final bit of the frame.  */
+  if (step2 > 0)
+    emit_insn (gen_add3_insn (stack_pointer_rtx, stack_pointer_rtx,
+			      GEN_INT (step2)));
+
+  if (use_restore_libcall)
+    {
+      emit_insn (gen_gpr_restore (GEN_INT (riscv_save_libcall_count (mask))));
+      emit_jump_insn (gen_gpr_restore_return (ra));
+      return;
+    }
+
+  /* Add in the __builtin_eh_return stack adjustment. */
+  if (crtl->calls_eh_return)
+    emit_insn (gen_add3_insn (stack_pointer_rtx, stack_pointer_rtx,
+			      EH_RETURN_STACKADJ_RTX));
+
+  if (!sibcall_p)
+    emit_jump_insn (gen_simple_return_internal (ra));
+}
+
+/* Return nonzero if this function is known to have a null epilogue.
+   This allows the optimizer to omit jumps to jumps if no stack
+   was created.  */
+
+bool
+riscv_can_use_return_insn (void)
+{
+  return reload_completed && cfun->machine->frame.total_size == 0;
+}
+
+/* Implement TARGET_REGISTER_MOVE_COST.  */
+
+static int
+riscv_register_move_cost (enum machine_mode mode,
+			  reg_class_t from, reg_class_t to)
+{
+  return SECONDARY_MEMORY_NEEDED (from, to, mode) ? 8 : 2;
+}
+
+/* Return true if register REGNO can store a value of mode MODE.
+   The result of this function is cached in riscv_hard_regno_mode_ok.  */
+
+static bool
+riscv_hard_regno_mode_ok_p (unsigned int regno, enum machine_mode mode)
+{
+  unsigned int size = GET_MODE_SIZE (mode);
+  enum mode_class mclass = GET_MODE_CLASS (mode);
+
+  /* This is hella bogus but ira_build segfaults on RV32 without it. */
+  if (VECTOR_MODE_P (mode))
+    return true;
+
+  if (GP_REG_P (regno))
+    {
+      if (size <= UNITS_PER_WORD)
+	return true;
+
+      /* Double-word values must be even-register-aligned.  */
+      if (size <= 2 * UNITS_PER_WORD)
+	return regno % 2 == 0;
+    }
+
+  if (FP_REG_P (regno))
+    {
+      if (mclass == MODE_FLOAT
+	  || mclass == MODE_COMPLEX_FLOAT
+	  || mclass == MODE_VECTOR_FLOAT)
+	return size <= UNITS_PER_FPVALUE;
+    }
+
+  return false;
+}
+
+/* Implement HARD_REGNO_NREGS.  */
+
+unsigned int
+riscv_hard_regno_nregs (int regno, enum machine_mode mode)
+{
+  if (FP_REG_P (regno))
+    return (GET_MODE_SIZE (mode) + UNITS_PER_FPREG - 1) / UNITS_PER_FPREG;
+
+  /* All other registers are word-sized.  */
+  return (GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
+}
+
+/* Implement CLASS_MAX_NREGS.  */
+
+static unsigned char
+riscv_class_max_nregs (reg_class_t rclass, enum machine_mode mode)
+{
+  if (reg_class_subset_p (FP_REGS, rclass))
+    return riscv_hard_regno_nregs (FP_REG_FIRST, mode);
+
+  if (reg_class_subset_p (GR_REGS, rclass))
+    return riscv_hard_regno_nregs (GP_REG_FIRST, mode);
+
+  return 0;
+}
+
+/* Implement TARGET_PREFERRED_RELOAD_CLASS.  */
+
+static reg_class_t
+riscv_preferred_reload_class (rtx x ATTRIBUTE_UNUSED, reg_class_t rclass)
+{
+  return reg_class_subset_p (FP_REGS, rclass) ? FP_REGS :
+         reg_class_subset_p (GR_REGS, rclass) ? GR_REGS :
+	 rclass;
+}
+
+/* Implement TARGET_MEMORY_MOVE_COST.  */
+
+static int
+riscv_memory_move_cost (enum machine_mode mode, reg_class_t rclass, bool in)
+{
+  return (tune_info->memory_cost
+	  + memory_move_secondary_cost (mode, rclass, in));
+} 
+
+/* Implement TARGET_MODE_REP_EXTENDED.  */
+
+static int
+riscv_mode_rep_extended (enum machine_mode mode, enum machine_mode mode_rep)
+{
+  /* On 64-bit targets, SImode register values are sign-extended to DImode.  */
+  if (TARGET_64BIT && mode == SImode && mode_rep == DImode)
+    return SIGN_EXTEND;
+
+  return UNKNOWN;
+}
+
+/* Implement TARGET_SCALAR_MODE_SUPPORTED_P.  */
+
+static bool
+riscv_scalar_mode_supported_p (enum machine_mode mode)
+{
+  if (ALL_FIXED_POINT_MODE_P (mode)
+      && GET_MODE_PRECISION (mode) <= 2 * BITS_PER_WORD)
+    return true;
+
+  return default_scalar_mode_supported_p (mode);
+}
+
+/* Return the number of instructions that can be issued per cycle.  */
+
+static int
+riscv_issue_rate (void)
+{
+  return tune_info->issue_rate;
+}
+
+/* This structure describes a single built-in function.  */
+struct riscv_builtin_description {
+  /* The code of the main .md file instruction.  See riscv_builtin_type
+     for more information.  */
+  enum insn_code icode;
+
+  /* The name of the built-in function.  */
+  const char *name;
+
+  /* Specifies how the function should be expanded.  */
+  enum riscv_builtin_type builtin_type;
+
+  /* The function's prototype.  */
+  enum riscv_function_type function_type;
+
+  /* Whether the function is available.  */
+  unsigned int (*avail) (void);
+};
+
+static unsigned int
+riscv_builtin_avail_riscv (void)
+{
+  return 1;
+}
+
+/* Construct a riscv_builtin_description from the given arguments.
+
+   INSN is the name of the associated instruction pattern, without the
+   leading CODE_FOR_riscv_.
+
+   CODE is the floating-point condition code associated with the
+   function.  It can be 'f' if the field is not applicable.
+
+   NAME is the name of the function itself, without the leading
+   "__builtin_riscv_".
+
+   BUILTIN_TYPE and FUNCTION_TYPE are riscv_builtin_description fields.
+
+   AVAIL is the name of the availability predicate, without the leading
+   riscv_builtin_avail_.  */
+#define RISCV_BUILTIN(INSN, NAME, BUILTIN_TYPE, FUNCTION_TYPE, AVAIL)	\
+  { CODE_FOR_ ## INSN, "__builtin_riscv_" NAME,				\
+    BUILTIN_TYPE, FUNCTION_TYPE, riscv_builtin_avail_ ## AVAIL }
+
+/* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT function
+   mapped to instruction CODE_FOR_<INSN>,  FUNCTION_TYPE and AVAIL
+   are as for RISCV_BUILTIN.  */
+#define DIRECT_BUILTIN(INSN, FUNCTION_TYPE, AVAIL)			\
+  RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT, FUNCTION_TYPE, AVAIL)
+
+/* Define __builtin_riscv_<INSN>, which is a RISCV_BUILTIN_DIRECT_NO_TARGET
+   function mapped to instruction CODE_FOR_<INSN>,  FUNCTION_TYPE
+   and AVAIL are as for RISCV_BUILTIN.  */
+#define DIRECT_NO_TARGET_BUILTIN(INSN, FUNCTION_TYPE, AVAIL)		\
+  RISCV_BUILTIN (INSN, #INSN, RISCV_BUILTIN_DIRECT_NO_TARGET,		\
+		FUNCTION_TYPE, AVAIL)
+
+static const struct riscv_builtin_description riscv_builtins[] = {
+  DIRECT_NO_TARGET_BUILTIN (nop, RISCV_VOID_FTYPE_VOID, riscv),
+};
+
+/* Index I is the function declaration for riscv_builtins[I], or null if the
+   function isn't defined on this target.  */
+static GTY(()) tree riscv_builtin_decls[ARRAY_SIZE (riscv_builtins)];
+
+
+/* Source-level argument types.  */
+#define RISCV_ATYPE_VOID void_type_node
+#define RISCV_ATYPE_INT integer_type_node
+#define RISCV_ATYPE_POINTER ptr_type_node
+#define RISCV_ATYPE_CPOINTER const_ptr_type_node
+
+/* Standard mode-based argument types.  */
+#define RISCV_ATYPE_UQI unsigned_intQI_type_node
+#define RISCV_ATYPE_SI intSI_type_node
+#define RISCV_ATYPE_USI unsigned_intSI_type_node
+#define RISCV_ATYPE_DI intDI_type_node
+#define RISCV_ATYPE_UDI unsigned_intDI_type_node
+#define RISCV_ATYPE_SF float_type_node
+#define RISCV_ATYPE_DF double_type_node
+
+/* RISCV_FTYPE_ATYPESN takes N RISCV_FTYPES-like type codes and lists
+   their associated RISCV_ATYPEs.  */
+#define RISCV_FTYPE_ATYPES1(A, B) \
+  RISCV_ATYPE_##A, RISCV_ATYPE_##B
+
+#define RISCV_FTYPE_ATYPES2(A, B, C) \
+  RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C
+
+#define RISCV_FTYPE_ATYPES3(A, B, C, D) \
+  RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C, RISCV_ATYPE_##D
+
+#define RISCV_FTYPE_ATYPES4(A, B, C, D, E) \
+  RISCV_ATYPE_##A, RISCV_ATYPE_##B, RISCV_ATYPE_##C, RISCV_ATYPE_##D, \
+  RISCV_ATYPE_##E
+
+/* Return the function type associated with function prototype TYPE.  */
+
+static tree
+riscv_build_function_type (enum riscv_function_type type)
+{
+  static tree types[(int) RISCV_MAX_FTYPE_MAX];
+
+  if (types[(int) type] == NULL_TREE)
+    switch (type)
+      {
+#define DEF_RISCV_FTYPE(NUM, ARGS)					\
+  case RISCV_FTYPE_NAME##NUM ARGS:					\
+    types[(int) type]							\
+      = build_function_type_list (RISCV_FTYPE_ATYPES##NUM ARGS,		\
+				  NULL_TREE);				\
+    break;
+#include "config/riscv/riscv-ftypes.def"
+#undef DEF_RISCV_FTYPE
+      default:
+	gcc_unreachable ();
+      }
+
+  return types[(int) type];
+}
+
+/* Implement TARGET_INIT_BUILTINS.  */
+
+static void
+riscv_init_builtins (void)
+{
+  const struct riscv_builtin_description *d;
+  unsigned int i;
+
+  /* Iterate through all of the bdesc arrays, initializing all of the
+     builtin functions.  */
+  for (i = 0; i < ARRAY_SIZE (riscv_builtins); i++)
+    {
+      d = &riscv_builtins[i];
+      if (d->avail ())
+	riscv_builtin_decls[i]
+	  = add_builtin_function (d->name,
+				  riscv_build_function_type (d->function_type),
+				  i, BUILT_IN_MD, NULL, NULL);
+    }
+}
+
+/* Implement TARGET_BUILTIN_DECL.  */
+
+static tree
+riscv_builtin_decl (unsigned int code, bool initialize_p ATTRIBUTE_UNUSED)
+{
+  if (code >= ARRAY_SIZE (riscv_builtins))
+    return error_mark_node;
+  return riscv_builtin_decls[code];
+}
+
+/* Take argument ARGNO from EXP's argument list and convert it into a
+   form suitable for input operand OPNO of instruction ICODE.  Return the
+   value.  */
+
+static rtx
+riscv_prepare_builtin_arg (enum insn_code icode,
+			  unsigned int opno, tree exp, unsigned int argno)
+{
+  tree arg;
+  rtx value;
+  enum machine_mode mode;
+
+  arg = CALL_EXPR_ARG (exp, argno);
+  value = expand_normal (arg);
+  mode = insn_data[icode].operand[opno].mode;
+  if (!insn_data[icode].operand[opno].predicate (value, mode))
+    {
+      /* We need to get the mode from ARG for two reasons:
+
+	   - to cope with address operands, where MODE is the mode of the
+	     memory, rather than of VALUE itself.
+
+	   - to cope with special predicates like pmode_register_operand,
+	     where MODE is VOIDmode.  */
+      value = copy_to_mode_reg (TYPE_MODE (TREE_TYPE (arg)), value);
+
+      /* Check the predicate again.  */
+      if (!insn_data[icode].operand[opno].predicate (value, mode))
+	{
+	  error ("invalid argument to built-in function");
+	  return const0_rtx;
+	}
+    }
+
+  return value;
+}
+
+/* Return an rtx suitable for output operand OP of instruction ICODE.
+   If TARGET is non-null, try to use it where possible.  */
+
+static rtx
+riscv_prepare_builtin_target (enum insn_code icode, unsigned int op, rtx target)
+{
+  enum machine_mode mode;
+
+  mode = insn_data[icode].operand[op].mode;
+  if (target == 0 || !insn_data[icode].operand[op].predicate (target, mode))
+    target = gen_reg_rtx (mode);
+
+  return target;
+}
+
+/* Expand a RISCV_BUILTIN_DIRECT or RISCV_BUILTIN_DIRECT_NO_TARGET function;
+   HAS_TARGET_P says which.  EXP is the CALL_EXPR that calls the function
+   and ICODE is the code of the associated .md pattern.  TARGET, if nonnull,
+   suggests a good place to put the result.  */
+
+static rtx
+riscv_expand_builtin_direct (enum insn_code icode, rtx target, tree exp,
+			    bool has_target_p)
+{
+  rtx ops[MAX_RECOG_OPERANDS];
+  int opno, argno;
+
+  /* Map any target to operand 0.  */
+  opno = 0;
+  if (has_target_p)
+    {
+      target = riscv_prepare_builtin_target (icode, opno, target);
+      ops[opno] = target;
+      opno++;
+    }
+
+  /* Map the arguments to the other operands.  The n_operands value
+     for an expander includes match_dups and match_scratches as well as
+     match_operands, so n_operands is only an upper bound on the number
+     of arguments to the expander function.  */
+  gcc_assert (opno + call_expr_nargs (exp) <= insn_data[icode].n_operands);
+  for (argno = 0; argno < call_expr_nargs (exp); argno++, opno++)
+    ops[opno] = riscv_prepare_builtin_arg (icode, opno, exp, argno);
+
+  switch (opno)
+    {
+    case 2:
+      emit_insn (GEN_FCN (icode) (ops[0], ops[1]));
+      break;
+
+    case 3:
+      emit_insn (GEN_FCN (icode) (ops[0], ops[1], ops[2]));
+      break;
+
+    case 4:
+      emit_insn (GEN_FCN (icode) (ops[0], ops[1], ops[2], ops[3]));
+      break;
+
+    default:
+      gcc_unreachable ();
+    }
+  return target;
+}
+
+/* Implement TARGET_EXPAND_BUILTIN.  */
+
+static rtx
+riscv_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
+		     enum machine_mode mode ATTRIBUTE_UNUSED,
+		     int ignore ATTRIBUTE_UNUSED)
+{
+  tree fndecl;
+  unsigned int fcode, avail;
+  const struct riscv_builtin_description *d;
+
+  fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0);
+  fcode = DECL_FUNCTION_CODE (fndecl);
+  gcc_assert (fcode < ARRAY_SIZE (riscv_builtins));
+  d = &riscv_builtins[fcode];
+  avail = d->avail ();
+  gcc_assert (avail != 0);
+  switch (d->builtin_type)
+    {
+    case RISCV_BUILTIN_DIRECT:
+      return riscv_expand_builtin_direct (d->icode, target, exp, true);
+
+    case RISCV_BUILTIN_DIRECT_NO_TARGET:
+      return riscv_expand_builtin_direct (d->icode, target, exp, false);
+    }
+  gcc_unreachable ();
+}
+
+/* Implement TARGET_ASM_OUTPUT_MI_THUNK.  Generate rtl rather than asm text
+   in order to avoid duplicating too much logic from elsewhere.  */
+
+static void
+riscv_output_mi_thunk (FILE *file, tree thunk_fndecl ATTRIBUTE_UNUSED,
+		      HOST_WIDE_INT delta, HOST_WIDE_INT vcall_offset,
+		      tree function)
+{
+  rtx this_rtx, temp1, temp2, fnaddr;
+  rtx_insn *insn;
+  bool use_sibcall_p;
+
+  /* Pretend to be a post-reload pass while generating rtl.  */
+  reload_completed = 1;
+
+  /* Mark the end of the (empty) prologue.  */
+  emit_note (NOTE_INSN_PROLOGUE_END);
+
+  /* Determine if we can use a sibcall to call FUNCTION directly.  */
+  fnaddr = XEXP (DECL_RTL (function), 0);
+  use_sibcall_p = absolute_symbolic_operand (fnaddr, Pmode);
+
+  /* We need two temporary registers in some cases.  */
+  temp1 = gen_rtx_REG (Pmode, GP_TEMP_FIRST);
+  temp2 = gen_rtx_REG (Pmode, GP_TEMP_FIRST + 1);
+
+  /* Find out which register contains the "this" pointer.  */
+  if (aggregate_value_p (TREE_TYPE (TREE_TYPE (function)), function))
+    this_rtx = gen_rtx_REG (Pmode, GP_ARG_FIRST + 1);
+  else
+    this_rtx = gen_rtx_REG (Pmode, GP_ARG_FIRST);
+
+  /* Add DELTA to THIS_RTX.  */
+  if (delta != 0)
+    {
+      rtx offset = GEN_INT (delta);
+      if (!SMALL_OPERAND (delta))
+	{
+	  riscv_emit_move (temp1, offset);
+	  offset = temp1;
+	}
+      emit_insn (gen_add3_insn (this_rtx, this_rtx, offset));
+    }
+
+  /* If needed, add *(*THIS_RTX + VCALL_OFFSET) to THIS_RTX.  */
+  if (vcall_offset != 0)
+    {
+      rtx addr;
+
+      /* Set TEMP1 to *THIS_RTX.  */
+      riscv_emit_move (temp1, gen_rtx_MEM (Pmode, this_rtx));
+
+      /* Set ADDR to a legitimate address for *THIS_RTX + VCALL_OFFSET.  */
+      addr = riscv_add_offset (temp2, temp1, vcall_offset);
+
+      /* Load the offset and add it to THIS_RTX.  */
+      riscv_emit_move (temp1, gen_rtx_MEM (Pmode, addr));
+      emit_insn (gen_add3_insn (this_rtx, this_rtx, temp1));
+    }
+
+  /* Jump to the target function.  Use a sibcall if direct jumps are
+     allowed, otherwise load the address into a register first.  */
+  if (use_sibcall_p)
+    {
+      insn = emit_call_insn (gen_sibcall_internal (fnaddr, const0_rtx));
+      SIBLING_CALL_P (insn) = 1;
+    }
+  else
+    {
+      riscv_emit_move(temp1, fnaddr);
+      emit_jump_insn (gen_indirect_jump (temp1));
+    }
+
+  /* Run just enough of rest_of_compilation.  This sequence was
+     "borrowed" from alpha.c.  */
+  insn = get_insns ();
+  split_all_insns_noflow ();
+  shorten_branches (insn);
+  final_start_function (insn, file, 1);
+  final (insn, file, 1);
+  final_end_function ();
+
+  /* Clean up the vars set above.  Note that final_end_function resets
+     the global pointer for us.  */
+  reload_completed = 0;
+}
+
+/* Allocate a chunk of memory for per-function machine-dependent data.  */
+
+static struct machine_function *
+riscv_init_machine_status (void)
+{
+  return ggc_cleared_alloc<machine_function> ();
+}
+
+/* Implement TARGET_OPTION_OVERRIDE.  */
+
+static void
+riscv_option_override (void)
+{
+  int regno, mode;
+  const struct riscv_cpu_info *cpu;
+
+#ifdef SUBTARGET_OVERRIDE_OPTIONS
+  SUBTARGET_OVERRIDE_OPTIONS;
+#endif
+
+  flag_pcc_struct_return = 0;
+
+  if (flag_pic)
+    g_switch_value = 0;
+
+  /* Prefer a call to memcpy over inline code when optimizing for size,
+     though see MOVE_RATIO in riscv.h.  */
+  if (optimize_size && (target_flags_explicit & MASK_MEMCPY) == 0)
+    target_flags |= MASK_MEMCPY;
+
+  /* Handle -mtune.  */
+  cpu = riscv_parse_cpu (riscv_tune_string ? riscv_tune_string :
+			 RISCV_TUNE_STRING_DEFAULT);
+  tune_info = optimize_size ? &optimize_size_tune_info : cpu->tune_info;
+
+  /* If the user hasn't specified a branch cost, use the processor's
+     default.  */
+  if (riscv_branch_cost == 0)
+    riscv_branch_cost = tune_info->branch_cost;
+
+  /* Set up riscv_hard_regno_mode_ok.  */
+  for (mode = 0; mode < MAX_MACHINE_MODE; mode++)
+    for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+      riscv_hard_regno_mode_ok[mode][regno]
+	= riscv_hard_regno_mode_ok_p (regno, (enum machine_mode) mode);
+
+  /* Function to allocate machine-dependent function status.  */
+  init_machine_status = &riscv_init_machine_status;
+
+  if (riscv_cmodel_string)
+    {
+      if (strcmp (riscv_cmodel_string, "medlow") == 0)
+	riscv_cmodel = CM_MEDLOW;
+      else if (strcmp (riscv_cmodel_string, "medany") == 0)
+	riscv_cmodel = CM_MEDANY;
+      else
+	error ("unsupported code model: %s", riscv_cmodel_string);
+    }
+
+  if (flag_pic)
+    riscv_cmodel = CM_PIC;
+
+  riscv_init_relocs ();
+}
+
+/* Implement TARGET_CONDITIONAL_REGISTER_USAGE.  */
+
+static void
+riscv_conditional_register_usage (void)
+{
+  int regno;
+
+  if (!TARGET_HARD_FLOAT)
+    {
+      for (regno = FP_REG_FIRST; regno <= FP_REG_LAST; regno++)
+	fixed_regs[regno] = call_used_regs[regno] = 1;
+    }
+}
+
+/* Return a register priority for hard reg REGNO.  */
+static int
+riscv_register_priority (int regno)
+{
+  /* Favor x8-x15/f8-f15 to improve the odds of RVC instruction selection.  */
+  if (TARGET_RVC && (IN_RANGE (regno, GP_REG_FIRST + 8, GP_REG_FIRST + 15)
+		     || IN_RANGE (regno, FP_REG_FIRST + 8, FP_REG_FIRST + 15)))
+    return 1;
+
+  return 0;
+}
+
+/* Implement TARGET_TRAMPOLINE_INIT.  */
+
+static void
+riscv_trampoline_init (rtx m_tramp, tree fndecl, rtx chain_value)
+{
+  rtx addr, end_addr, mem;
+  uint32_t trampoline[4];
+  unsigned int i;
+  HOST_WIDE_INT static_chain_offset, target_function_offset;
+
+  /* Work out the offsets of the pointers from the start of the
+     trampoline code.  */
+  gcc_assert (ARRAY_SIZE (trampoline) * 4 == TRAMPOLINE_CODE_SIZE);
+  static_chain_offset = TRAMPOLINE_CODE_SIZE;
+  target_function_offset = static_chain_offset + GET_MODE_SIZE (ptr_mode);
+
+  /* Get pointers to the beginning and end of the code block.  */
+  addr = force_reg (Pmode, XEXP (m_tramp, 0));
+  end_addr = riscv_force_binary (Pmode, PLUS, addr, GEN_INT (TRAMPOLINE_CODE_SIZE));
+
+  /* auipc   t0, 0
+     l[wd]   t1, target_function_offset(t0)
+     l[wd]   t0, static_chain_offset(t0)
+     jr      t1
+  */
+  trampoline[0] = OPCODE_AUIPC | (STATIC_CHAIN_REGNUM << SHIFT_RD);
+  trampoline[1] = (Pmode == DImode ? OPCODE_LD : OPCODE_LW)
+		  | (RISCV_PROLOGUE_TEMP_REGNUM << SHIFT_RD)
+		  | (STATIC_CHAIN_REGNUM << SHIFT_RS1)
+		  | (target_function_offset << SHIFT_IMM);
+  trampoline[2] = (Pmode == DImode ? OPCODE_LD : OPCODE_LW)
+		  | (STATIC_CHAIN_REGNUM << SHIFT_RD)
+		  | (STATIC_CHAIN_REGNUM << SHIFT_RS1)
+		  | (static_chain_offset << SHIFT_IMM);
+  trampoline[3] = OPCODE_JALR | (RISCV_PROLOGUE_TEMP_REGNUM << SHIFT_RS1);
+
+  /* Copy the trampoline code.  */
+  for (i = 0; i < ARRAY_SIZE (trampoline); i++)
+    {
+      mem = adjust_address (m_tramp, SImode, i * GET_MODE_SIZE (SImode));
+      riscv_emit_move (mem, gen_int_mode (trampoline[i], SImode));
+    }
+
+  /* Set up the static chain pointer field.  */
+  mem = adjust_address (m_tramp, ptr_mode, static_chain_offset);
+  riscv_emit_move (mem, chain_value);
+
+  /* Set up the target function field.  */
+  mem = adjust_address (m_tramp, ptr_mode, target_function_offset);
+  riscv_emit_move (mem, XEXP (DECL_RTL (fndecl), 0));
+
+  /* Flush the code part of the trampoline.  */
+  emit_insn (gen_add3_insn (end_addr, addr, GEN_INT (TRAMPOLINE_SIZE)));
+  emit_insn (gen_clear_cache (addr, end_addr));
+}
+
+/* Implement TARGET_FUNCTION_OK_FOR_SIBCALL.  */
+
+static bool
+riscv_function_ok_for_sibcall (tree decl ATTRIBUTE_UNUSED,
+			       tree exp ATTRIBUTE_UNUSED)
+{
+  if (TARGET_SAVE_RESTORE)
+    {
+      /* When optimzing for size, don't use sibcalls in non-leaf routines */
+      if (cfun->machine->is_leaf == 0)
+	cfun->machine->is_leaf = leaf_function_p () ? 1 : -1;
+
+      return cfun->machine->is_leaf > 0;
+    }
+
+  return true;
+}
+
+/* Initialize the GCC target structure.  */
+#undef TARGET_ASM_ALIGNED_HI_OP
+#define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
+#undef TARGET_ASM_ALIGNED_SI_OP
+#define TARGET_ASM_ALIGNED_SI_OP "\t.word\t"
+#undef TARGET_ASM_ALIGNED_DI_OP
+#define TARGET_ASM_ALIGNED_DI_OP "\t.dword\t"
+
+#undef TARGET_OPTION_OVERRIDE
+#define TARGET_OPTION_OVERRIDE riscv_option_override
+
+#undef TARGET_LEGITIMIZE_ADDRESS
+#define TARGET_LEGITIMIZE_ADDRESS riscv_legitimize_address
+
+#undef TARGET_SCHED_ISSUE_RATE
+#define TARGET_SCHED_ISSUE_RATE riscv_issue_rate
+
+#undef TARGET_FUNCTION_OK_FOR_SIBCALL
+#define TARGET_FUNCTION_OK_FOR_SIBCALL riscv_function_ok_for_sibcall
+
+#undef TARGET_REGISTER_MOVE_COST
+#define TARGET_REGISTER_MOVE_COST riscv_register_move_cost
+#undef TARGET_MEMORY_MOVE_COST
+#define TARGET_MEMORY_MOVE_COST riscv_memory_move_cost
+#undef TARGET_RTX_COSTS
+#define TARGET_RTX_COSTS riscv_rtx_costs
+#undef TARGET_ADDRESS_COST
+#define TARGET_ADDRESS_COST riscv_address_cost
+
+#undef  TARGET_PREFERRED_RELOAD_CLASS
+#define TARGET_PREFERRED_RELOAD_CLASS riscv_preferred_reload_class
+
+#undef TARGET_ASM_FILE_START_FILE_DIRECTIVE
+#define TARGET_ASM_FILE_START_FILE_DIRECTIVE true
+
+#undef TARGET_EXPAND_BUILTIN_VA_START
+#define TARGET_EXPAND_BUILTIN_VA_START riscv_va_start
+
+#undef  TARGET_PROMOTE_FUNCTION_MODE
+#define TARGET_PROMOTE_FUNCTION_MODE default_promote_function_mode_always_promote
+
+#undef TARGET_RETURN_IN_MEMORY
+#define TARGET_RETURN_IN_MEMORY riscv_return_in_memory
+
+#undef TARGET_ASM_OUTPUT_MI_THUNK
+#define TARGET_ASM_OUTPUT_MI_THUNK riscv_output_mi_thunk
+#undef TARGET_ASM_CAN_OUTPUT_MI_THUNK
+#define TARGET_ASM_CAN_OUTPUT_MI_THUNK hook_bool_const_tree_hwi_hwi_const_tree_true
+
+#undef TARGET_PRINT_OPERAND
+#define TARGET_PRINT_OPERAND riscv_print_operand
+#undef TARGET_PRINT_OPERAND_ADDRESS
+#define TARGET_PRINT_OPERAND_ADDRESS riscv_print_operand_address
+
+#undef TARGET_SETUP_INCOMING_VARARGS
+#define TARGET_SETUP_INCOMING_VARARGS riscv_setup_incoming_varargs
+#undef TARGET_STRICT_ARGUMENT_NAMING
+#define TARGET_STRICT_ARGUMENT_NAMING hook_bool_CUMULATIVE_ARGS_true
+#undef TARGET_MUST_PASS_IN_STACK
+#define TARGET_MUST_PASS_IN_STACK must_pass_in_stack_var_size
+#undef TARGET_PASS_BY_REFERENCE
+#define TARGET_PASS_BY_REFERENCE riscv_pass_by_reference
+#undef TARGET_ARG_PARTIAL_BYTES
+#define TARGET_ARG_PARTIAL_BYTES riscv_arg_partial_bytes
+#undef TARGET_FUNCTION_ARG
+#define TARGET_FUNCTION_ARG riscv_function_arg
+#undef TARGET_FUNCTION_ARG_ADVANCE
+#define TARGET_FUNCTION_ARG_ADVANCE riscv_function_arg_advance
+#undef TARGET_FUNCTION_ARG_BOUNDARY
+#define TARGET_FUNCTION_ARG_BOUNDARY riscv_function_arg_boundary
+
+#undef TARGET_MODE_REP_EXTENDED
+#define TARGET_MODE_REP_EXTENDED riscv_mode_rep_extended
+
+#undef TARGET_SCALAR_MODE_SUPPORTED_P
+#define TARGET_SCALAR_MODE_SUPPORTED_P riscv_scalar_mode_supported_p
+
+#undef TARGET_INIT_BUILTINS
+#define TARGET_INIT_BUILTINS riscv_init_builtins
+#undef TARGET_BUILTIN_DECL
+#define TARGET_BUILTIN_DECL riscv_builtin_decl
+#undef TARGET_EXPAND_BUILTIN
+#define TARGET_EXPAND_BUILTIN riscv_expand_builtin
+
+#undef TARGET_HAVE_TLS
+#define TARGET_HAVE_TLS HAVE_AS_TLS
+
+#undef TARGET_CANNOT_FORCE_CONST_MEM
+#define TARGET_CANNOT_FORCE_CONST_MEM riscv_cannot_force_const_mem
+
+#undef TARGET_LEGITIMATE_CONSTANT_P
+#define TARGET_LEGITIMATE_CONSTANT_P riscv_legitimate_constant_p
+
+#undef TARGET_USE_BLOCKS_FOR_CONSTANT_P
+#define TARGET_USE_BLOCKS_FOR_CONSTANT_P hook_bool_mode_const_rtx_true
+
+#ifdef HAVE_AS_DTPRELWORD
+#undef TARGET_ASM_OUTPUT_DWARF_DTPREL
+#define TARGET_ASM_OUTPUT_DWARF_DTPREL riscv_output_dwarf_dtprel
+#endif
+
+#undef TARGET_LEGITIMATE_ADDRESS_P
+#define TARGET_LEGITIMATE_ADDRESS_P	riscv_legitimate_address_p
+
+#undef TARGET_CAN_ELIMINATE
+#define TARGET_CAN_ELIMINATE riscv_can_eliminate
+
+#undef TARGET_CONDITIONAL_REGISTER_USAGE
+#define TARGET_CONDITIONAL_REGISTER_USAGE riscv_conditional_register_usage
+
+#undef TARGET_CLASS_MAX_NREGS
+#define TARGET_CLASS_MAX_NREGS riscv_class_max_nregs
+
+#undef TARGET_TRAMPOLINE_INIT
+#define TARGET_TRAMPOLINE_INIT riscv_trampoline_init
+
+#undef TARGET_IN_SMALL_DATA_P
+#define TARGET_IN_SMALL_DATA_P riscv_in_small_data_p
+
+#undef TARGET_ASM_SELECT_RTX_SECTION
+#define TARGET_ASM_SELECT_RTX_SECTION  riscv_elf_select_rtx_section
+
+#undef TARGET_MIN_ANCHOR_OFFSET
+#define TARGET_MIN_ANCHOR_OFFSET (-IMM_REACH/2)
+
+#undef TARGET_MAX_ANCHOR_OFFSET
+#define TARGET_MAX_ANCHOR_OFFSET (IMM_REACH/2-1)
+
+#undef TARGET_LRA_P
+#define TARGET_LRA_P hook_bool_void_true
+
+#undef TARGET_REGISTER_PRIORITY
+#define TARGET_REGISTER_PRIORITY riscv_register_priority
+
+struct gcc_target targetm = TARGET_INITIALIZER;
+
+#include "gt-riscv.h"
diff -urN empty/gcc/config/riscv/riscv-ftypes.def gcc-5.3.0/gcc/config/riscv/riscv-ftypes.def
--- empty/gcc/config/riscv/riscv-ftypes.def	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv-ftypes.def	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,39 @@
+/* Definitions of prototypes for RISC-V built-in functions.
+   Copyright (C) 2011-2014 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+   Based on MIPS target for GNU compiler.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* Invoke DEF_RISCV_FTYPE (NARGS, LIST) for each prototype used by
+   MIPS built-in functions, where:
+
+      NARGS is the number of arguments.
+      LIST contains the return-type code followed by the codes for each
+        argument type.
+
+   Argument- and return-type codes are either modes or one of the following:
+
+      VOID for void_type_node
+      INT for integer_type_node
+      POINTER for ptr_type_node
+
+   (we don't use PTR because that's a ANSI-compatibillity macro).
+
+   Please keep this list lexicographically sorted by the LIST argument.  */
+
+DEF_RISCV_FTYPE (1, (VOID, VOID))
diff -urN empty/gcc/config/riscv/riscv.h gcc-5.3.0/gcc/config/riscv/riscv.h
--- empty/gcc/config/riscv/riscv.h	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv.h	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,1079 @@
+/* Definition of RISC-V target for GNU compiler.
+   Copyright (C) 2011-2014 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+   Based on MIPS target for GNU compiler.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* TARGET_HARD_FLOAT and TARGET_SOFT_FLOAT reflect whether the FPU is
+   directly accessible, while the command-line options select
+   TARGET_HARD_FLOAT_ABI and TARGET_SOFT_FLOAT_ABI to reflect the ABI
+   in use.  */
+#define TARGET_HARD_FLOAT TARGET_HARD_FLOAT_ABI
+#define TARGET_SOFT_FLOAT TARGET_SOFT_FLOAT_ABI
+
+/* Target CPU builtins.  */
+#define TARGET_CPU_CPP_BUILTINS()					\
+  do									\
+    {									\
+      builtin_assert ("machine=riscv");					\
+									\
+      builtin_assert ("cpu=riscv");					\
+      builtin_define ("__riscv__");					\
+      builtin_define ("__riscv");					\
+      builtin_define ("_riscv");					\
+      builtin_define ("__riscv");					\
+									\
+      if (TARGET_64BIT)							\
+	{								\
+	  builtin_define ("__riscv64");					\
+	  builtin_define ("_RISCV_SIM=_ABI64");				\
+	}								\
+      else								\
+	{								\
+	  builtin_define ("__riscv32");					\
+	  builtin_define ("_RISCV_SIM=_ABI32");				\
+	}								\
+									\
+      builtin_define ("_ABI32=1");					\
+      builtin_define ("_ABI64=3");					\
+									\
+									\
+      builtin_define_with_int_value ("_RISCV_SZINT", INT_TYPE_SIZE);	\
+      builtin_define_with_int_value ("_RISCV_SZLONG", LONG_TYPE_SIZE);	\
+      builtin_define_with_int_value ("_RISCV_SZPTR", POINTER_SIZE);	\
+									\
+      if (TARGET_RVC)							\
+	builtin_define ("__riscv_compressed");				\
+									\
+      if (TARGET_ATOMIC)						\
+	builtin_define ("__riscv_atomic");				\
+									\
+      if (TARGET_MULDIV)						\
+	builtin_define ("__riscv_muldiv");				\
+									\
+      if (TARGET_HARD_FLOAT_ABI)					\
+	{								\
+	  builtin_define ("__riscv_hard_float");			\
+	  if (TARGET_FDIV)						\
+	    {								\
+	      builtin_define ("__riscv_fdiv");				\
+	      builtin_define ("__riscv_fsqrt");				\
+	    }								\
+	}								\
+      else								\
+	builtin_define ("__riscv_soft_float");				\
+									\
+      /* The base RISC-V ISA is always little-endian. */		\
+      builtin_define_std ("RISCVEL");					\
+									\
+      if (riscv_cmodel == CM_MEDANY)					\
+	builtin_define ("_RISCV_CMODEL_MEDANY");			\
+    }									\
+  while (0)
+
+/* Default target_flags if no switches are specified  */
+
+#ifndef TARGET_DEFAULT
+#define TARGET_DEFAULT 0
+#endif
+
+#ifndef RISCV_ARCH_STRING_DEFAULT
+#define RISCV_ARCH_STRING_DEFAULT "IMAFD"
+#endif
+
+#ifndef RISCV_TUNE_STRING_DEFAULT
+#define RISCV_TUNE_STRING_DEFAULT "rocket"
+#endif
+
+#ifndef TARGET_64BIT_DEFAULT
+#define TARGET_64BIT_DEFAULT 1
+#endif
+
+#if TARGET_64BIT_DEFAULT
+# define MULTILIB_ARCH_DEFAULT "m64"
+# define OPT_ARCH64 "!m32"
+# define OPT_ARCH32 "m32"
+#else
+# define MULTILIB_ARCH_DEFAULT "m32"
+# define OPT_ARCH64 "m64"
+# define OPT_ARCH32 "!m64"
+#endif
+
+#ifndef MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS \
+    { MULTILIB_ARCH_DEFAULT }
+#endif
+
+
+/* Support for a compile-time default CPU, et cetera.  The rules are:
+   --with-arch is ignored if -march is specified.
+   --with-tune is ignored if -mtune is specified.
+   --with-float is ignored if -mhard-float or -msoft-float are specified. */
+#define OPTION_DEFAULT_SPECS \
+  {"arch", "%{!march=*:-march=%(VALUE)}"},			   \
+  {"arch_32", "%{" OPT_ARCH32 ":%{m32}}" }, \
+  {"arch_64", "%{" OPT_ARCH64 ":%{m64}}" }, \
+  {"tune", "%{!mtune=*:-mtune=%(VALUE)}" }, \
+  {"float", "%{!msoft-float:%{!mhard-float:-m%(VALUE)-float}}" }, \
+
+#define DRIVER_SELF_SPECS ""
+
+#ifdef IN_LIBGCC2
+#undef TARGET_64BIT
+/* Make this compile time constant for libgcc2 */
+#ifdef __riscv64
+#define TARGET_64BIT		1
+#else
+#define TARGET_64BIT		0
+#endif
+#endif /* IN_LIBGCC2 */
+
+/* Tell collect what flags to pass to nm.  */
+#ifndef NM_FLAGS
+#define NM_FLAGS "-Bn"
+#endif
+
+#undef ASM_SPEC
+#define ASM_SPEC "\
+%(subtarget_asm_debugging_spec) \
+%{m32} %{m64} %{!m32:%{!m64: %(asm_abi_default_spec)}} \
+%{mrvc} %{mno-rvc} \
+%{msoft-float} %{mhard-float} \
+%{fPIC|fpic|fPIE|fpie:-fpic} \
+%{march=*} \
+%(subtarget_asm_spec)"
+
+/* Extra switches sometimes passed to the linker.  */
+
+#ifndef LINK_SPEC
+#define LINK_SPEC "\
+%{!T:-dT riscv.ld} \
+%{m64:-melf64lriscv} \
+%{m32:-melf32lriscv} \
+%{shared}"
+#endif  /* LINK_SPEC defined */
+
+/* This macro defines names of additional specifications to put in the specs
+   that can be used in various specifications like CC1_SPEC.  Its definition
+   is an initializer with a subgrouping for each command option.
+
+   Each subgrouping contains a string constant, that defines the
+   specification name, and a string constant that used by the GCC driver
+   program.
+
+   Do not define this macro if it does not need to do anything.  */
+
+#define EXTRA_SPECS							\
+  { "asm_abi_default_spec", "-" MULTILIB_ARCH_DEFAULT },		\
+  SUBTARGET_EXTRA_SPECS
+
+#ifndef SUBTARGET_EXTRA_SPECS
+#define SUBTARGET_EXTRA_SPECS
+#endif
+
+#define TARGET_DEFAULT_CMODEL CM_MEDLOW
+
+/* By default, turn on GDB extensions.  */
+#define DEFAULT_GDB_EXTENSIONS 1
+
+#define LOCAL_LABEL_PREFIX	"."
+#define USER_LABEL_PREFIX	""
+
+#define DWARF2_DEBUGGING_INFO 1
+#define DWARF2_ASM_LINE_DEBUG_INFO 0
+
+/* The mapping from gcc register number to DWARF 2 CFA column number.  */
+#define DWARF_FRAME_REGNUM(REGNO) \
+  (GP_REG_P (REGNO) || FP_REG_P (REGNO) ? REGNO : INVALID_REGNUM)
+
+/* The DWARF 2 CFA column which tracks the return address.  */
+#define DWARF_FRAME_RETURN_COLUMN RETURN_ADDR_REGNUM
+
+/* Don't emit .cfi_sections, as it does not work */
+#undef HAVE_GAS_CFI_SECTIONS_DIRECTIVE
+#define HAVE_GAS_CFI_SECTIONS_DIRECTIVE 0
+
+/* Before the prologue, RA lives in r31.  */
+#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (VOIDmode, RETURN_ADDR_REGNUM)
+
+/* Describe how we implement __builtin_eh_return.  */
+#define EH_RETURN_DATA_REGNO(N) \
+  ((N) < 4 ? (N) + GP_ARG_FIRST : INVALID_REGNUM)
+
+#define EH_RETURN_STACKADJ_RTX  gen_rtx_REG (Pmode, GP_ARG_FIRST + 4)
+
+/* Target machine storage layout */
+
+#define BITS_BIG_ENDIAN 0
+#define BYTES_BIG_ENDIAN 0
+#define WORDS_BIG_ENDIAN 0
+
+#define MAX_BITS_PER_WORD 64
+
+/* Width of a word, in units (bytes).  */
+#define UNITS_PER_WORD (TARGET_64BIT ? 8 : 4)
+#ifndef IN_LIBGCC2
+#define MIN_UNITS_PER_WORD 4
+#endif
+
+/* We currently require both or neither of the `F' and `D' extensions. */
+#define UNITS_PER_FPREG 8
+
+/* The largest size of value that can be held in floating-point
+   registers and moved with a single instruction.  */
+#define UNITS_PER_HWFPVALUE \
+  (TARGET_SOFT_FLOAT_ABI ? 0 : UNITS_PER_FPREG)
+
+/* The largest size of value that can be held in floating-point
+   registers.  */
+#define UNITS_PER_FPVALUE			\
+  (TARGET_SOFT_FLOAT_ABI ? 0			\
+   : LONG_DOUBLE_TYPE_SIZE / BITS_PER_UNIT)
+
+/* The number of bytes in a double.  */
+#define UNITS_PER_DOUBLE (TYPE_PRECISION (double_type_node) / BITS_PER_UNIT)
+
+/* Set the sizes of the core types.  */
+#define SHORT_TYPE_SIZE 16
+#define INT_TYPE_SIZE 32
+#define LONG_TYPE_SIZE (TARGET_64BIT ? 64 : 32)
+#define LONG_LONG_TYPE_SIZE 64
+
+#define FLOAT_TYPE_SIZE 32
+#define DOUBLE_TYPE_SIZE 64
+/* XXX The ABI says long doubles are IEEE-754-2008 float128s. */
+#define LONG_DOUBLE_TYPE_SIZE 64
+
+#ifdef IN_LIBGCC2
+# define LIBGCC2_LONG_DOUBLE_TYPE_SIZE LONG_DOUBLE_TYPE_SIZE
+#endif
+
+/* Allocation boundary (in *bits*) for storing arguments in argument list.  */
+#define PARM_BOUNDARY BITS_PER_WORD
+
+/* Allocation boundary (in *bits*) for the code of a function.  */
+#define FUNCTION_BOUNDARY (TARGET_RVC ? 16 : 32)
+
+/* There is no point aligning anything to a rounder boundary than this.  */
+#define BIGGEST_ALIGNMENT 128
+
+/* All accesses must be aligned.  */
+#define STRICT_ALIGNMENT 1
+
+/* Define this if you wish to imitate the way many other C compilers
+   handle alignment of bitfields and the structures that contain
+   them.
+
+   The behavior is that the type written for a bit-field (`int',
+   `short', or other integer type) imposes an alignment for the
+   entire structure, as if the structure really did contain an
+   ordinary field of that type.  In addition, the bit-field is placed
+   within the structure so that it would fit within such a field,
+   not crossing a boundary for it.
+
+   Thus, on most machines, a bit-field whose type is written as `int'
+   would not cross a four-byte boundary, and would force four-byte
+   alignment for the whole structure.  (The alignment used may not
+   be four bytes; it is controlled by the other alignment
+   parameters.)
+
+   If the macro is defined, its definition should be a C expression;
+   a nonzero value for the expression enables this behavior.  */
+
+#define PCC_BITFIELD_TYPE_MATTERS 1
+
+/* If defined, a C expression to compute the alignment given to a
+   constant that is being placed in memory.  CONSTANT is the constant
+   and ALIGN is the alignment that the object would ordinarily have.
+   The value of this macro is used instead of that alignment to align
+   the object.
+
+   If this macro is not defined, then ALIGN is used.
+
+   The typical use of this macro is to increase alignment for string
+   constants to be word aligned so that `strcpy' calls that copy
+   constants can be done inline.  */
+
+#define CONSTANT_ALIGNMENT(EXP, ALIGN)					\
+  ((TREE_CODE (EXP) == STRING_CST  || TREE_CODE (EXP) == CONSTRUCTOR)	\
+   && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
+
+/* If defined, a C expression to compute the alignment for a static
+   variable.  TYPE is the data type, and ALIGN is the alignment that
+   the object would ordinarily have.  The value of this macro is used
+   instead of that alignment to align the object.
+
+   If this macro is not defined, then ALIGN is used.
+
+   One use of this macro is to increase alignment of medium-size
+   data to make it all fit in fewer cache lines.  Another is to
+   cause character arrays to be word-aligned so that `strcpy' calls
+   that copy constants to character arrays can be done inline.  */
+
+#undef DATA_ALIGNMENT
+#define DATA_ALIGNMENT(TYPE, ALIGN)					\
+  ((((ALIGN) < BITS_PER_WORD)						\
+    && (TREE_CODE (TYPE) == ARRAY_TYPE					\
+	|| TREE_CODE (TYPE) == UNION_TYPE				\
+	|| TREE_CODE (TYPE) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
+
+/* We need this for the same reason as DATA_ALIGNMENT, namely to cause
+   character arrays to be word-aligned so that `strcpy' calls that copy
+   constants to character arrays can be done inline, and 'strcmp' can be
+   optimised to use word loads. */
+#define LOCAL_ALIGNMENT(TYPE, ALIGN) \
+  DATA_ALIGNMENT (TYPE, ALIGN)
+
+/* Define if operations between registers always perform the operation
+   on the full register even if a narrower mode is specified.  */
+#define WORD_REGISTER_OPERATIONS
+
+/* When in 64-bit mode, move insns will sign extend SImode and CCmode
+   moves.  All other references are zero extended.  */
+#define LOAD_EXTEND_OP(MODE) \
+  (TARGET_64BIT && ((MODE) == SImode || (MODE) == CCmode) \
+   ? SIGN_EXTEND : ZERO_EXTEND)
+
+/* Define this macro if it is advisable to hold scalars in registers
+   in a wider mode than that declared by the program.  In such cases,
+   the value is constrained to be within the bounds of the declared
+   type, but kept valid in the wider mode.  The signedness of the
+   extension may differ from that of the type.  */
+
+#define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)	\
+  if (GET_MODE_CLASS (MODE) == MODE_INT		\
+      && GET_MODE_SIZE (MODE) < 4)		\
+    {						\
+      (MODE) = Pmode;				\
+    }
+
+/* Pmode is always the same as ptr_mode, but not always the same as word_mode.
+   Extensions of pointers to word_mode must be signed.  */
+#define POINTERS_EXTEND_UNSIGNED false
+
+/* When floating-point registers are wider than integer ones, moves between
+   them must go through memory.  */
+#define SECONDARY_MEMORY_NEEDED(CLASS1,CLASS2,MODE)	\
+  (GET_MODE_SIZE (MODE) > UNITS_PER_WORD		\
+   && ((CLASS1) == FP_REGS) != ((CLASS2) == FP_REGS))
+
+/* Define if loading short immediate values into registers sign extends.  */
+#define SHORT_IMMEDIATES_SIGN_EXTEND
+
+/* Standard register usage.  */
+
+/* Number of hardware registers.  We have:
+
+   - 32 integer registers
+   - 32 floating point registers
+   - 32 vector integer registers
+   - 32 vector floating point registers
+   - 2 fake registers:
+	- ARG_POINTER_REGNUM
+	- FRAME_POINTER_REGNUM */
+
+#define FIRST_PSEUDO_REGISTER 66
+
+/* x0, sp, gp, and tp are fixed. */
+
+#define FIXED_REGISTERS							\
+{ /* General registers.  */                                             \
+  1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
+  /* Floating-point registers.  */                                      \
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,			\
+  /* Others.  */                                                        \
+  1, 1 \
+}
+
+
+/* a0-a7, t0-a6, fa0-fa7, and ft0-ft11 are volatile across calls.
+   The call RTLs themselves clobber ra.  */
+
+#define CALL_USED_REGISTERS						\
+{ /* General registers.  */                                             \
+  1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,			\
+  1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,			\
+  /* Floating-point registers.  */                                      \
+  1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,			\
+  1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,			\
+  /* Others.  */                                                        \
+  1, 1 \
+}
+
+#define CALL_REALLY_USED_REGISTERS                                      \
+{ /* General registers.  */                                             \
+  1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,			\
+  1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,			\
+  /* Floating-point registers.  */                                      \
+  1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1,			\
+  1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,			\
+  /* Others.  */                                                        \
+  1, 1 \
+}
+
+/* Internal macros to classify an ISA register's type. */
+
+#define GP_REG_FIRST 0
+#define GP_REG_LAST  31
+#define GP_REG_NUM   (GP_REG_LAST - GP_REG_FIRST + 1)
+
+#define FP_REG_FIRST 32
+#define FP_REG_LAST  63
+#define FP_REG_NUM   (FP_REG_LAST - FP_REG_FIRST + 1)
+
+/* The DWARF 2 CFA column which tracks the return address from a
+   signal handler context.  This means that to maintain backwards
+   compatibility, no hard register can be assigned this column if it
+   would need to be handled by the DWARF unwinder.  */
+#define DWARF_ALT_FRAME_RETURN_COLUMN 64
+
+#define GP_REG_P(REGNO)	\
+  ((unsigned int) ((int) (REGNO) - GP_REG_FIRST) < GP_REG_NUM)
+#define FP_REG_P(REGNO)  \
+  ((unsigned int) ((int) (REGNO) - FP_REG_FIRST) < FP_REG_NUM)
+
+#define FP_REG_RTX_P(X) (REG_P (X) && FP_REG_P (REGNO (X)))
+
+/* Return coprocessor number from register number.  */
+
+#define COPNUM_AS_CHAR_FROM_REGNUM(REGNO) 				\
+  (COP0_REG_P (REGNO) ? '0' : COP2_REG_P (REGNO) ? '2'			\
+   : COP3_REG_P (REGNO) ? '3' : '?')
+
+
+#define HARD_REGNO_NREGS(REGNO, MODE) riscv_hard_regno_nregs (REGNO, MODE)
+
+#define HARD_REGNO_MODE_OK(REGNO, MODE)					\
+  riscv_hard_regno_mode_ok[ (int)(MODE) ][ (REGNO) ]
+
+#define MODES_TIEABLE_P(MODE1, MODE2)					\
+  ((MODE1) == (MODE2) || (GET_MODE_CLASS (MODE1) == MODE_INT		\
+			  && GET_MODE_CLASS (MODE2) == MODE_INT))
+
+/* Use s0 as the frame pointer if it is so requested. */
+#define HARD_FRAME_POINTER_REGNUM 8
+#define STACK_POINTER_REGNUM 2
+#define THREAD_POINTER_REGNUM 4
+
+/* These two registers don't really exist: they get eliminated to either
+   the stack or hard frame pointer.  */
+#define ARG_POINTER_REGNUM 64
+#define FRAME_POINTER_REGNUM 65
+
+#define HARD_FRAME_POINTER_IS_FRAME_POINTER 0
+#define HARD_FRAME_POINTER_IS_ARG_POINTER 0
+
+/* Register in which static-chain is passed to a function.  */
+#define STATIC_CHAIN_REGNUM GP_TEMP_FIRST
+
+/* Registers used as temporaries in prologue/epilogue code.
+
+   The prologue registers mustn't conflict with any
+   incoming arguments, the static chain pointer, or the frame pointer.
+   The epilogue temporary mustn't conflict with the return registers,
+   the frame pointer, the EH stack adjustment, or the EH data registers. */
+
+#define RISCV_PROLOGUE_TEMP_REGNUM (GP_TEMP_FIRST + 1)
+#define RISCV_PROLOGUE_TEMP(MODE) gen_rtx_REG (MODE, RISCV_PROLOGUE_TEMP_REGNUM)
+
+#define FUNCTION_PROFILER(STREAM, LABELNO)	\
+{						\
+    sorry ("profiler support for RISC-V");	\
+}
+
+/* Define this macro if it is as good or better to call a constant
+   function address than to call an address kept in a register.  */
+#define NO_FUNCTION_CSE 1
+
+/* Define the classes of registers for register constraints in the
+   machine description.  Also define ranges of constants.
+
+   One of the classes must always be named ALL_REGS and include all hard regs.
+   If there is more than one class, another class must be named NO_REGS
+   and contain no registers.
+
+   The name GENERAL_REGS must be the name of a class (or an alias for
+   another name such as ALL_REGS).  This is the class of registers
+   that is allowed by "g" or "r" in a register constraint.
+   Also, registers outside this class are allocated only when
+   instructions express preferences for them.
+
+   The classes must be numbered in nondecreasing order; that is,
+   a larger-numbered class must never be contained completely
+   in a smaller-numbered class.
+
+   For any two classes, it is very desirable that there be another
+   class that represents their union.  */
+
+enum reg_class
+{
+  NO_REGS,			/* no registers in set */
+  T_REGS,			/* registers used by indirect sibcalls */
+  JALR_REGS,			/* registers used by indirect calls */
+  GR_REGS,			/* integer registers */
+  FP_REGS,			/* floating point registers */
+  FRAME_REGS,			/* $arg and $frame */
+  ALL_REGS,			/* all registers */
+  LIM_REG_CLASSES		/* max value + 1 */
+};
+
+#define N_REG_CLASSES (int) LIM_REG_CLASSES
+
+#define GENERAL_REGS GR_REGS
+
+/* An initializer containing the names of the register classes as C
+   string constants.  These names are used in writing some of the
+   debugging dumps.  */
+
+#define REG_CLASS_NAMES							\
+{									\
+  "NO_REGS",								\
+  "T_REGS",								\
+  "JALR_REGS",								\
+  "GR_REGS",								\
+  "FP_REGS",								\
+  "FRAME_REGS",								\
+  "ALL_REGS"								\
+}
+
+/* An initializer containing the contents of the register classes,
+   as integers which are bit masks.  The Nth integer specifies the
+   contents of class N.  The way the integer MASK is interpreted is
+   that register R is in the class if `MASK & (1 << R)' is 1.
+
+   When the machine has more than 32 registers, an integer does not
+   suffice.  Then the integers are replaced by sub-initializers,
+   braced groupings containing several integers.  Each
+   sub-initializer must be suitable as an initializer for the type
+   `HARD_REG_SET' which is defined in `hard-reg-set.h'.  */
+
+#define REG_CLASS_CONTENTS									\
+{												\
+  { 0x00000000, 0x00000000, 0x00000000 },	/* NO_REGS */		\
+  { 0xf0000040, 0x00000000, 0x00000000 },	/* T_REGS */		\
+  { 0xffffff40, 0x00000000, 0x00000000 },	/* JALR_REGS */		\
+  { 0xffffffff, 0x00000000, 0x00000000 },	/* GR_REGS */		\
+  { 0x00000000, 0xffffffff, 0x00000000 },	/* FP_REGS */		\
+  { 0x00000000, 0x00000000, 0x00000003 },	/* FRAME_REGS */	\
+  { 0xffffffff, 0xffffffff, 0x00000003 }	/* ALL_REGS */		\
+}
+
+/* A C expression whose value is a register class containing hard
+   register REGNO.  In general there is more that one such class;
+   choose a class which is "minimal", meaning that no smaller class
+   also contains the register.  */
+
+#define REGNO_REG_CLASS(REGNO) riscv_regno_to_class[ (REGNO) ]
+
+/* A macro whose definition is the name of the class to which a
+   valid base register must belong.  A base register is one used in
+   an address which is the register value plus a displacement.  */
+
+#define BASE_REG_CLASS GR_REGS
+
+/* A macro whose definition is the name of the class to which a
+   valid index register must belong.  An index register is one used
+   in an address where its value is either multiplied by a scale
+   factor or added to another register (as well as added to a
+   displacement).  */
+
+#define INDEX_REG_CLASS NO_REGS
+
+/* We generally want to put call-clobbered registers ahead of
+   call-saved ones.  (IRA expects this.)  */
+
+#define REG_ALLOC_ORDER							\
+{ \
+  /* Call-clobbered GPRs.  */						\
+  15, 14, 13, 12, 11, 10, 16, 17, 6, 28, 29, 30, 31, 5, 7, 1,		\
+  /* Call-saved GPRs.  */						\
+  8, 9, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,	       			\
+  /* GPRs that can never be exposed to the register allocator.  */	\
+  0, 2, 3, 4,								\
+  /* Call-clobbered FPRs.  */						\
+  47, 46, 45, 44, 43, 42, 32, 33, 34, 35, 36, 37, 38, 39, 48, 49,	\
+  60, 61, 62, 63,							\
+  /* Call-saved FPRs.  */						\
+  40, 41, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,			\
+  /* None of the remaining classes have defined call-saved		\
+     registers.  */							\
+  64, 65								\
+}
+
+/* True if VALUE is a signed 12-bit number.  */
+
+#define SMALL_OPERAND(VALUE) \
+  ((unsigned HOST_WIDE_INT) (VALUE) + IMM_REACH/2 < IMM_REACH)
+
+/* True if VALUE can be loaded into a register using LUI.  */
+
+#define LUI_OPERAND(VALUE)						\
+  (((VALUE) | ((1UL<<31) - IMM_REACH)) == ((1UL<<31) - IMM_REACH)	\
+   || ((VALUE) | ((1UL<<31) - IMM_REACH)) + IMM_REACH == 0)
+
+#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
+  reg_classes_intersect_p (FP_REGS, CLASS)
+
+/* Stack layout; function entry, exit and calling.  */
+
+#define STACK_GROWS_DOWNWARD
+
+#define FRAME_GROWS_DOWNWARD 1
+
+#define STARTING_FRAME_OFFSET 0
+
+#define RETURN_ADDR_RTX riscv_return_addr
+
+#define ELIMINABLE_REGS							\
+{{ ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},				\
+ { ARG_POINTER_REGNUM,   HARD_FRAME_POINTER_REGNUM},			\
+ { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},				\
+ { FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM}}				\
+
+#define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
+  (OFFSET) = riscv_initial_elimination_offset (FROM, TO)
+
+/* Allocate stack space for arguments at the beginning of each function.  */
+#define ACCUMULATE_OUTGOING_ARGS 1
+
+/* The argument pointer always points to the first argument.  */
+#define FIRST_PARM_OFFSET(FNDECL) 0
+
+#define REG_PARM_STACK_SPACE(FNDECL) 0
+
+/* Define this if it is the responsibility of the caller to
+   allocate the area reserved for arguments passed in registers.
+   If `ACCUMULATE_OUTGOING_ARGS' is also defined, the only effect
+   of this macro is to determine whether the space is included in
+   `crtl->outgoing_args_size'.  */
+#define OUTGOING_REG_PARM_STACK_SPACE(FNTYPE) 1
+
+#define STACK_BOUNDARY 128
+
+/* Symbolic macros for the registers used to return integer and floating
+   point values.  */
+
+#define GP_RETURN GP_ARG_FIRST
+#define FP_RETURN ((TARGET_SOFT_FLOAT) ? GP_RETURN : FP_ARG_FIRST)
+
+#define MAX_ARGS_IN_REGISTERS 8
+
+/* Symbolic macros for the first/last argument registers.  */
+
+#define GP_ARG_FIRST (GP_REG_FIRST + 10)
+#define GP_ARG_LAST  (GP_ARG_FIRST + MAX_ARGS_IN_REGISTERS - 1)
+#define GP_TEMP_FIRST (GP_REG_FIRST + 5)
+#define FP_ARG_FIRST (FP_REG_FIRST + 10)
+#define FP_ARG_LAST  (FP_ARG_FIRST + MAX_ARGS_IN_REGISTERS - 1)
+
+#define CALLEE_SAVED_REG_NUMBER(REGNO)			\
+  ((REGNO) >= 8 && (REGNO) <= 9 ? (REGNO) - 8 :		\
+   (REGNO) >= 18 && (REGNO) <= 27 ? (REGNO) - 16 : -1)
+
+#define LIBCALL_VALUE(MODE) \
+  riscv_function_value (NULL_TREE, NULL_TREE, MODE)
+
+#define FUNCTION_VALUE(VALTYPE, FUNC) \
+  riscv_function_value (VALTYPE, FUNC, VOIDmode)
+
+#define FUNCTION_VALUE_REGNO_P(N) ((N) == GP_RETURN || (N) == FP_RETURN)
+
+/* 1 if N is a possible register number for function argument passing.
+   We have no FP argument registers when soft-float.  When FP registers
+   are 32 bits, we can't directly reference the odd numbered ones.  */
+
+/* Accept arguments in a0-a7 and/or fa0-fa7. */
+#define FUNCTION_ARG_REGNO_P(N)					\
+  (IN_RANGE((N), GP_ARG_FIRST, GP_ARG_LAST)			\
+   || IN_RANGE((N), FP_ARG_FIRST, FP_ARG_LAST))
+
+/* The ABI views the arguments as a structure, of which the first 8
+   words go in registers and the rest go on the stack.  If I < 8, N, the Ith
+   word might go in the Ith integer argument register or the Ith
+   floating-point argument register. */
+
+typedef struct {
+  /* Number of integer registers used so far, up to MAX_ARGS_IN_REGISTERS. */
+  unsigned int num_gprs;
+
+  /* Number of words passed on the stack.  */
+  unsigned int stack_words;
+} CUMULATIVE_ARGS;
+
+/* Initialize a variable CUM of type CUMULATIVE_ARGS
+   for a call to a function whose data type is FNTYPE.
+   For a library call, FNTYPE is 0.  */
+
+#define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \
+  memset (&(CUM), 0, sizeof (CUM))
+
+#define EPILOGUE_USES(REGNO)	((REGNO) == RETURN_ADDR_REGNUM)
+
+/* ABI requires 16-byte alignment, even on ven on RV32. */
+#define RISCV_STACK_ALIGN(LOC) (((LOC) + 15) & -16)
+
+#define NO_PROFILE_COUNTERS 1
+
+/* Define this macro if the code for function profiling should come
+   before the function prologue.  Normally, the profiling code comes
+   after.  */
+
+/* #define PROFILE_BEFORE_PROLOGUE */
+
+/* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
+   the stack pointer does not matter.  The value is tested only in
+   functions that have frame pointers.
+   No definition is equivalent to always zero.  */
+
+#define EXIT_IGNORE_STACK 1
+
+
+/* Trampolines are a block of code followed by two pointers.  */
+
+#define TRAMPOLINE_CODE_SIZE 16
+#define TRAMPOLINE_SIZE (TRAMPOLINE_CODE_SIZE + POINTER_SIZE * 2)
+#define TRAMPOLINE_ALIGNMENT POINTER_SIZE
+
+/* Addressing modes, and classification of registers for them.  */
+
+#define REGNO_OK_FOR_INDEX_P(REGNO) 0
+#define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) \
+  riscv_regno_mode_ok_for_base_p (REGNO, MODE, 1)
+
+/* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
+   and check its validity for a certain class.
+   We have two alternate definitions for each of them.
+   The usual definition accepts all pseudo regs; the other rejects them all.
+   The symbol REG_OK_STRICT causes the latter definition to be used.
+
+   Most source files want to accept pseudo regs in the hope that
+   they will get allocated to the class that the insn wants them to be in.
+   Some source files that are used after register allocation
+   need to be strict.  */
+
+#ifndef REG_OK_STRICT
+#define REG_MODE_OK_FOR_BASE_P(X, MODE) \
+  riscv_regno_mode_ok_for_base_p (REGNO (X), MODE, 0)
+#else
+#define REG_MODE_OK_FOR_BASE_P(X, MODE) \
+  riscv_regno_mode_ok_for_base_p (REGNO (X), MODE, 1)
+#endif
+
+#define REG_OK_FOR_INDEX_P(X) 0
+
+
+/* Maximum number of registers that can appear in a valid memory address.  */
+
+#define MAX_REGS_PER_ADDRESS 1
+
+#define CONSTANT_ADDRESS_P(X) \
+  (CONSTANT_P (X) && memory_address_p (SImode, X))
+
+/* This handles the magic '..CURRENT_FUNCTION' symbol, which means
+   'the start of the function that this code is output in'.  */
+
+#define ASM_OUTPUT_LABELREF(FILE,NAME)  \
+  if (strcmp (NAME, "..CURRENT_FUNCTION") == 0)				\
+    asm_fprintf ((FILE), "%U%s",					\
+		 XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));	\
+  else									\
+    asm_fprintf ((FILE), "%U%s", (NAME))
+
+/* This flag marks functions that cannot be lazily bound.  */
+#define SYMBOL_FLAG_BIND_NOW (SYMBOL_FLAG_MACH_DEP << 1)
+#define SYMBOL_REF_BIND_NOW_P(RTX) \
+  ((SYMBOL_REF_FLAGS (RTX) & SYMBOL_FLAG_BIND_NOW) != 0)
+
+#define JUMP_TABLES_IN_TEXT_SECTION 0
+#define CASE_VECTOR_MODE SImode
+#define CASE_VECTOR_PC_RELATIVE (riscv_cmodel != CM_MEDLOW)
+
+/* Define this as 1 if `char' should by default be signed; else as 0.  */
+#define DEFAULT_SIGNED_CHAR 0
+
+/* Consider using fld/fsd to move 8 bytes at a time for RV32IFD. */
+#define MOVE_MAX UNITS_PER_WORD
+#define MAX_MOVE_MAX 8
+
+#define SLOW_BYTE_ACCESS 0
+
+#define SHIFT_COUNT_TRUNCATED 1
+
+/* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
+   is done just by pretending it is already truncated.  */
+#define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) \
+  (TARGET_64BIT ? ((INPREC) <= 32 || (OUTPREC) < 32) : 1)
+
+/* Specify the machine mode that pointers have.
+   After generation of rtl, the compiler makes no further distinction
+   between pointers and any other objects of this machine mode.  */
+
+#ifndef Pmode
+#define Pmode (TARGET_64BIT ? DImode : SImode)
+#endif
+
+/* Give call MEMs SImode since it is the "most permissive" mode
+   for both 32-bit and 64-bit targets.  */
+
+#define FUNCTION_MODE SImode
+
+/* A C expression for the cost of a branch instruction.  A value of 2
+   seems to minimize code size.  */
+
+#define BRANCH_COST(speed_p, predictable_p) \
+  ((!(speed_p) || (predictable_p)) ? 2 : riscv_branch_cost)
+
+#define LOGICAL_OP_NON_SHORT_CIRCUIT 0
+
+/* Control the assembler format that we output.  */
+
+/* Output to assembler file text saying following lines
+   may contain character constants, extra white space, comments, etc.  */
+
+#ifndef ASM_APP_ON
+#define ASM_APP_ON " #APP\n"
+#endif
+
+/* Output to assembler file text saying following lines
+   no longer contain unusual constructs.  */
+
+#ifndef ASM_APP_OFF
+#define ASM_APP_OFF " #NO_APP\n"
+#endif
+
+#define REGISTER_NAMES						\
+{ "zero","ra",  "sp",  "gp",  "tp",  "t0",  "t1",  "t2",	\
+  "s0",  "s1",  "a0",  "a1",  "a2",  "a3",  "a4",  "a5",	\
+  "a6",  "a7",  "s2",  "s3",  "s4",  "s5",  "s6",  "s7",	\
+  "s8",  "s9",  "s10", "s11", "t3",  "t4",  "t5",  "t6",	\
+  "ft0", "ft1", "ft2", "ft3", "ft4", "ft5", "ft6", "ft7",	\
+  "fs0", "fs1", "fa0", "fa1", "fa2", "fa3", "fa4", "fa5",	\
+  "fa6", "fa7", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",	\
+  "fs8", "fs9", "fs10","fs11","ft8", "ft9", "ft10","ft11",	\
+  "arg", "frame", }
+
+#define ADDITIONAL_REGISTER_NAMES					\
+{									\
+  { "x0",	 0 + GP_REG_FIRST },					\
+  { "x1",	 1 + GP_REG_FIRST },					\
+  { "x2",	 2 + GP_REG_FIRST },					\
+  { "x3",	 3 + GP_REG_FIRST },					\
+  { "x4",	 4 + GP_REG_FIRST },					\
+  { "x5",	 5 + GP_REG_FIRST },					\
+  { "x6",	 6 + GP_REG_FIRST },					\
+  { "x7",	 7 + GP_REG_FIRST },					\
+  { "x8",	 8 + GP_REG_FIRST },					\
+  { "x9",	 9 + GP_REG_FIRST },					\
+  { "x10",	10 + GP_REG_FIRST },					\
+  { "x11",	11 + GP_REG_FIRST },					\
+  { "x12",	12 + GP_REG_FIRST },					\
+  { "x13",	13 + GP_REG_FIRST },					\
+  { "x14",	14 + GP_REG_FIRST },					\
+  { "x15",	15 + GP_REG_FIRST },					\
+  { "x16",	16 + GP_REG_FIRST },					\
+  { "x17",	17 + GP_REG_FIRST },					\
+  { "x18",	18 + GP_REG_FIRST },					\
+  { "x19",	19 + GP_REG_FIRST },					\
+  { "x20",	20 + GP_REG_FIRST },					\
+  { "x21",	21 + GP_REG_FIRST },					\
+  { "x22",	22 + GP_REG_FIRST },					\
+  { "x23",	23 + GP_REG_FIRST },					\
+  { "x24",	24 + GP_REG_FIRST },					\
+  { "x25",	25 + GP_REG_FIRST },					\
+  { "x26",	26 + GP_REG_FIRST },					\
+  { "x27",	27 + GP_REG_FIRST },					\
+  { "x28",	28 + GP_REG_FIRST },					\
+  { "x29",	29 + GP_REG_FIRST },					\
+  { "x30",	30 + GP_REG_FIRST },					\
+  { "x31",	31 + GP_REG_FIRST },					\
+  { "f0",	 0 + FP_REG_FIRST },					\
+  { "f1",	 1 + FP_REG_FIRST },					\
+  { "f2",	 2 + FP_REG_FIRST },					\
+  { "f3",	 3 + FP_REG_FIRST },					\
+  { "f4",	 4 + FP_REG_FIRST },					\
+  { "f5",	 5 + FP_REG_FIRST },					\
+  { "f6",	 6 + FP_REG_FIRST },					\
+  { "f7",	 7 + FP_REG_FIRST },					\
+  { "f8",	 8 + FP_REG_FIRST },					\
+  { "f9",	 9 + FP_REG_FIRST },					\
+  { "f10",	10 + FP_REG_FIRST },					\
+  { "f11",	11 + FP_REG_FIRST },					\
+  { "f12",	12 + FP_REG_FIRST },					\
+  { "f13",	13 + FP_REG_FIRST },					\
+  { "f14",	14 + FP_REG_FIRST },					\
+  { "f15",	15 + FP_REG_FIRST },					\
+  { "f16",	16 + FP_REG_FIRST },					\
+  { "f17",	17 + FP_REG_FIRST },					\
+  { "f18",	18 + FP_REG_FIRST },					\
+  { "f19",	19 + FP_REG_FIRST },					\
+  { "f20",	20 + FP_REG_FIRST },					\
+  { "f21",	21 + FP_REG_FIRST },					\
+  { "f22",	22 + FP_REG_FIRST },					\
+  { "f23",	23 + FP_REG_FIRST },					\
+  { "f24",	24 + FP_REG_FIRST },					\
+  { "f25",	25 + FP_REG_FIRST },					\
+  { "f26",	26 + FP_REG_FIRST },					\
+  { "f27",	27 + FP_REG_FIRST },					\
+  { "f28",	28 + FP_REG_FIRST },					\
+  { "f29",	29 + FP_REG_FIRST },					\
+  { "f30",	30 + FP_REG_FIRST },					\
+  { "f31",	31 + FP_REG_FIRST },					\
+}
+
+/* Globalizing directive for a label.  */
+#define GLOBAL_ASM_OP "\t.globl\t"
+
+/* This is how to store into the string LABEL
+   the symbol_ref name of an internal numbered label where
+   PREFIX is the class of label and NUM is the number within the class.
+   This is suitable for output with `assemble_name'.  */
+
+#undef ASM_GENERATE_INTERNAL_LABEL
+#define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)			\
+  sprintf ((LABEL), "*%s%s%ld", (LOCAL_LABEL_PREFIX), (PREFIX), (long)(NUM))
+
+/* This is how to output an element of a case-vector that is absolute.  */
+
+#define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE)				\
+  fprintf (STREAM, "\t.word\t%sL%d\n", LOCAL_LABEL_PREFIX, VALUE)
+
+/* This is how to output an element of a PIC case-vector. */
+
+#define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL)		\
+  fprintf (STREAM, "\t.word\t%sL%d-%sL%d\n",				\
+	   LOCAL_LABEL_PREFIX, VALUE, LOCAL_LABEL_PREFIX, REL)
+
+/* This is how to output an assembler line
+   that says to advance the location counter
+   to a multiple of 2**LOG bytes.  */
+
+#define ASM_OUTPUT_ALIGN(STREAM,LOG)					\
+  fprintf (STREAM, "\t.align\t%d\n", (LOG))
+
+/* Define the strings to put out for each section in the object file.  */
+#define TEXT_SECTION_ASM_OP	"\t.text"	/* instructions */
+#define DATA_SECTION_ASM_OP	"\t.data"	/* large data */
+#define READONLY_DATA_SECTION_ASM_OP	"\t.section\t.rodata"
+#define BSS_SECTION_ASM_OP	"\t.bss"
+#define SBSS_SECTION_ASM_OP	"\t.section\t.sbss,\"aw\",@nobits"
+#define SDATA_SECTION_ASM_OP	"\t.section\t.sdata,\"aw\",@progbits"
+
+#define ASM_OUTPUT_REG_PUSH(STREAM,REGNO)				\
+do									\
+  {									\
+    fprintf (STREAM, "\taddi\t%s,%s,-8\n\t%s\t%s,0(%s)\n",		\
+	     reg_names[STACK_POINTER_REGNUM],				\
+	     reg_names[STACK_POINTER_REGNUM],				\
+	     TARGET_64BIT ? "sd" : "sw",				\
+	     reg_names[REGNO],						\
+	     reg_names[STACK_POINTER_REGNUM]);				\
+  }									\
+while (0)
+
+#define ASM_OUTPUT_REG_POP(STREAM,REGNO)				\
+do									\
+  {									\
+    fprintf (STREAM, "\t%s\t%s,0(%s)\n\taddi\t%s,%s,8\n",		\
+	     TARGET_64BIT ? "ld" : "lw",				\
+	     reg_names[REGNO],						\
+	     reg_names[STACK_POINTER_REGNUM],				\
+	     reg_names[STACK_POINTER_REGNUM],				\
+	     reg_names[STACK_POINTER_REGNUM]);				\
+  }									\
+while (0)
+
+#define ASM_COMMENT_START "#"
+
+#undef SIZE_TYPE
+#define SIZE_TYPE (POINTER_SIZE == 64 ? "long unsigned int" : "unsigned int")
+
+#undef PTRDIFF_TYPE
+#define PTRDIFF_TYPE (POINTER_SIZE == 64 ? "long int" : "int")
+
+/* The maximum number of bytes that can be copied by one iteration of
+   a movmemsi loop; see riscv_block_move_loop.  */
+#define RISCV_MAX_MOVE_BYTES_PER_LOOP_ITER (UNITS_PER_WORD * 4)
+
+/* The maximum number of bytes that can be copied by a straight-line
+   implementation of movmemsi; see riscv_block_move_straight.  We want
+   to make sure that any loop-based implementation will iterate at
+   least twice.  */
+#define RISCV_MAX_MOVE_BYTES_STRAIGHT (RISCV_MAX_MOVE_BYTES_PER_LOOP_ITER * 2)
+
+/* The base cost of a memcpy call, for MOVE_RATIO and friends. */
+
+#define RISCV_CALL_RATIO 6
+
+/* Any loop-based implementation of movmemsi will have at least
+   RISCV_MAX_MOVE_BYTES_STRAIGHT / UNITS_PER_WORD memory-to-memory
+   moves, so allow individual copies of fewer elements.
+
+   When movmemsi is not available, use a value approximating
+   the length of a memcpy call sequence, so that move_by_pieces
+   will generate inline code if it is shorter than a function call.
+   Since move_by_pieces_ninsns counts memory-to-memory moves, but
+   we'll have to generate a load/store pair for each, halve the
+   value of RISCV_CALL_RATIO to take that into account.  */
+
+#define MOVE_RATIO(speed)				\
+  (HAVE_movmemsi					\
+   ? RISCV_MAX_MOVE_BYTES_STRAIGHT / MOVE_MAX		\
+   : RISCV_CALL_RATIO / 2)
+
+/* For CLEAR_RATIO, when optimizing for size, give a better estimate
+   of the length of a memset call, but use the default otherwise.  */
+
+#define CLEAR_RATIO(speed)\
+  ((speed) ? 15 : RISCV_CALL_RATIO)
+
+/* This is similar to CLEAR_RATIO, but for a non-zero constant, so when
+   optimizing for size adjust the ratio to account for the overhead of
+   loading the constant and replicating it across the word.  */
+
+#define SET_RATIO(speed) \
+  ((speed) ? 15 : RISCV_CALL_RATIO - 2)
+
+#ifndef HAVE_AS_TLS
+#define HAVE_AS_TLS 0
+#endif
+
+#ifndef USED_FOR_TARGET
+
+extern const enum reg_class riscv_regno_to_class[];
+extern bool riscv_hard_regno_mode_ok[][FIRST_PSEUDO_REGISTER];
+extern const char* riscv_hi_relocs[];
+#endif
+
+#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \
+  (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4)
+
+/* ISA constants needed for code generation.  */
+#define OPCODE_LW    0x2003
+#define OPCODE_LD    0x3003
+#define OPCODE_AUIPC 0x17
+#define OPCODE_JALR  0x67
+#define SHIFT_RD  7
+#define SHIFT_RS1 15
+#define SHIFT_IMM 20
+#define IMM_BITS 12
+
+#define IMM_REACH (1LL << IMM_BITS)
+#define CONST_HIGH_PART(VALUE) (((VALUE) + (IMM_REACH/2)) & ~(IMM_REACH-1))
+#define CONST_LOW_PART(VALUE) ((VALUE) - CONST_HIGH_PART (VALUE))
diff -urN empty/gcc/config/riscv/riscv.md gcc-5.3.0/gcc/config/riscv/riscv.md
--- empty/gcc/config/riscv/riscv.md	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv.md	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,2421 @@
+;; Machine description for RISC-V for GNU compiler.
+;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
+;; Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+;; Based on MIPS target for GNU compiler.
+
+;; This file is part of GCC.
+
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_c_enum "unspec" [
+  ;; Floating-point moves.
+  UNSPEC_LOAD_LOW
+  UNSPEC_LOAD_HIGH
+  UNSPEC_STORE_WORD
+
+  ;; GP manipulation.
+  UNSPEC_EH_RETURN
+
+  ;; Symbolic accesses.
+  UNSPEC_ADDRESS_FIRST
+  UNSPEC_LOAD_GOT
+  UNSPEC_TLS
+  UNSPEC_TLS_LE
+  UNSPEC_TLS_IE
+  UNSPEC_TLS_GD
+
+  ;; Register save and restore.
+  UNSPEC_GPR_SAVE
+  UNSPEC_GPR_RESTORE
+
+  ;; Blockage and synchronisation.
+  UNSPEC_BLOCKAGE
+  UNSPEC_FENCE
+  UNSPEC_FENCE_I
+])
+
+(define_constants
+  [(RETURN_ADDR_REGNUM		1)
+   (T0_REGNUM			5)
+   (T1_REGNUM			6)
+])
+
+(include "predicates.md")
+(include "constraints.md")
+
+;; ....................
+;;
+;;	Attributes
+;;
+;; ....................
+
+(define_attr "got" "unset,xgot_high,load"
+  (const_string "unset"))
+
+;; Classification of moves, extensions and truncations.  Most values
+;; are as for "type" (see below) but there are also the following
+;; move-specific values:
+;;
+;; andi		a single ANDI instruction
+;; shift_shift	a shift left followed by a shift right
+;;
+;; This attribute is used to determine the instruction's length and
+;; scheduling type.  For doubleword moves, the attribute always describes
+;; the split instructions; in some cases, it is more appropriate for the
+;; scheduling type to be "multi" instead.
+(define_attr "move_type"
+  "unknown,load,fpload,store,fpstore,mtc,mfc,move,fmove,
+   const,logical,arith,andi,shift_shift"
+  (const_string "unknown"))
+
+;; Main data type used by the insn
+(define_attr "mode" "unknown,none,QI,HI,SI,DI,TI,SF,DF,TF,FPSW"
+  (const_string "unknown"))
+
+;; True if the main data type is twice the size of a word.
+(define_attr "dword_mode" "no,yes"
+  (cond [(and (eq_attr "mode" "DI,DF")
+	      (eq (symbol_ref "TARGET_64BIT") (const_int 0)))
+	 (const_string "yes")
+
+	 (and (eq_attr "mode" "TI,TF")
+	      (ne (symbol_ref "TARGET_64BIT") (const_int 0)))
+	 (const_string "yes")]
+	(const_string "no")))
+
+;; Classification of each insn.
+;; branch	conditional branch
+;; jump		unconditional jump
+;; call		unconditional call
+;; load		load instruction(s)
+;; fpload	floating point load
+;; store	store instruction(s)
+;; fpstore	floating point store
+;; mtc		transfer to coprocessor
+;; mfc		transfer from coprocessor
+;; const	load constant
+;; arith	integer arithmetic instructions
+;; logical      integer logical instructions
+;; shift	integer shift instructions
+;; slt		set less than instructions
+;; imul		integer multiply 
+;; idiv		integer divide
+;; move		integer register move (addi rd, rs1, 0)
+;; fmove	floating point register move
+;; fadd		floating point add/subtract
+;; fmul		floating point multiply
+;; fmadd	floating point multiply-add
+;; fdiv		floating point divide
+;; fcmp		floating point compare
+;; fcvt		floating point convert
+;; fsqrt	floating point square root
+;; multi	multiword sequence (or user asm statements)
+;; nop		no operation
+;; ghost	an instruction that produces no real code
+(define_attr "type"
+  "unknown,branch,jump,call,load,fpload,store,fpstore,
+   mtc,mfc,const,arith,logical,shift,slt,imul,idiv,move,fmove,fadd,fmul,
+   fmadd,fdiv,fcmp,fcvt,fsqrt,multi,nop,ghost"
+  (cond [(eq_attr "got" "load") (const_string "load")
+
+	 ;; If a doubleword move uses these expensive instructions,
+	 ;; it is usually better to schedule them in the same way
+	 ;; as the singleword form, rather than as "multi".
+	 (eq_attr "move_type" "load") (const_string "load")
+	 (eq_attr "move_type" "fpload") (const_string "fpload")
+	 (eq_attr "move_type" "store") (const_string "store")
+	 (eq_attr "move_type" "fpstore") (const_string "fpstore")
+	 (eq_attr "move_type" "mtc") (const_string "mtc")
+	 (eq_attr "move_type" "mfc") (const_string "mfc")
+
+	 ;; These types of move are always single insns.
+	 (eq_attr "move_type" "fmove") (const_string "fmove")
+	 (eq_attr "move_type" "arith") (const_string "arith")
+	 (eq_attr "move_type" "logical") (const_string "logical")
+	 (eq_attr "move_type" "andi") (const_string "logical")
+
+	 ;; These types of move are always split.
+	 (eq_attr "move_type" "shift_shift")
+	   (const_string "multi")
+
+	 ;; These types of move are split for doubleword modes only.
+	 (and (eq_attr "move_type" "move,const")
+	      (eq_attr "dword_mode" "yes"))
+	   (const_string "multi")
+	 (eq_attr "move_type" "move") (const_string "move")
+	 (eq_attr "move_type" "const") (const_string "const")]
+	(const_string "unknown")))
+
+;; Mode for conversion types (fcvt)
+;; I2S          integer to float single (SI/DI to SF)
+;; I2D          integer to float double (SI/DI to DF)
+;; S2I          float to integer (SF to SI/DI)
+;; D2I          float to integer (DF to SI/DI)
+;; D2S          double to float single
+;; S2D          float single to double
+
+(define_attr "cnv_mode" "unknown,I2S,I2D,S2I,D2I,D2S,S2D" 
+  (const_string "unknown"))
+
+;; Length of instruction in bytes.
+(define_attr "length" ""
+   (cond [
+	  ;; Direct branch instructions have a range of [-0x1000,0xffc],
+	  ;; relative to the address of the delay slot.  If a branch is
+	  ;; outside this range, convert a branch like:
+	  ;;
+	  ;;	bne	r1,r2,target
+	  ;;
+	  ;; to:
+	  ;;
+	  ;;	beq	r1,r2,1f
+	  ;;  j target
+	  ;; 1:
+	  ;;
+	  (eq_attr "type" "branch")
+	  (if_then_else (and (le (minus (match_dup 0) (pc)) (const_int 4088))
+				  (le (minus (pc) (match_dup 0)) (const_int 4092)))
+	  (const_int 4)
+	  (const_int 8))
+
+	  ;; Conservatively assume calls take two instructions, as in:
+	  ;;   auipc t0, %pcrel_hi(target)
+	  ;;   jalr  ra, t0, %lo(target)
+	  ;; The linker will relax these into JAL when appropriate.
+	  (eq_attr "type" "call") (const_int 8)
+
+	  ;; "Ghost" instructions occupy no space.
+	  (eq_attr "type" "ghost") (const_int 0)
+
+	  (eq_attr "got" "load") (const_int 8)
+
+	  (eq_attr "type" "fcmp") (const_int 8)
+
+	  ;; SHIFT_SHIFTs are decomposed into two separate instructions.
+	  (eq_attr "move_type" "shift_shift")
+		(const_int 8)
+
+	  ;; Check for doubleword moves that are decomposed into two
+	  ;; instructions.
+	  (and (eq_attr "move_type" "mtc,mfc,move")
+	       (eq_attr "dword_mode" "yes"))
+	  (const_int 8)
+
+	  ;; Doubleword CONST{,N} moves are split into two word
+	  ;; CONST{,N} moves.
+	  (and (eq_attr "move_type" "const")
+	       (eq_attr "dword_mode" "yes"))
+	  (symbol_ref "riscv_split_const_insns (operands[1]) * 4")
+
+	  ;; Otherwise, constants, loads and stores are handled by external
+	  ;; routines.
+	  (eq_attr "move_type" "load,fpload")
+	  (symbol_ref "riscv_load_store_insns (operands[1], insn) * 4")
+	  (eq_attr "move_type" "store,fpstore")
+	  (symbol_ref "riscv_load_store_insns (operands[0], insn) * 4")
+	  ] (const_int 4)))
+
+;; Describe a user's asm statement.
+(define_asm_attributes
+  [(set_attr "type" "multi")])
+
+;; This mode iterator allows 32-bit and 64-bit GPR patterns to be generated
+;; from the same template.
+(define_mode_iterator GPR [SI (DI "TARGET_64BIT")])
+(define_mode_iterator SUPERQI [HI SI (DI "TARGET_64BIT")])
+
+;; A copy of GPR that can be used when a pattern has two independent
+;; modes.
+(define_mode_iterator GPR2 [SI (DI "TARGET_64BIT")])
+
+;; This mode iterator allows :P to be used for patterns that operate on
+;; pointer-sized quantities.  Exactly one of the two alternatives will match.
+(define_mode_iterator P [(SI "Pmode == SImode") (DI "Pmode == DImode")])
+
+;; 32-bit integer moves for which we provide move patterns.
+(define_mode_iterator IMOVE32 [SI])
+
+;; 64-bit modes for which we provide move patterns.
+(define_mode_iterator MOVE64 [DI DF])
+
+;; 128-bit modes for which we provide move patterns on 64-bit targets.
+(define_mode_iterator MOVE128 [TI TF])
+
+;; This mode iterator allows the QI and HI extension patterns to be
+;; defined from the same template.
+(define_mode_iterator SHORT [QI HI])
+
+;; Likewise the 64-bit truncate-and-shift patterns.
+(define_mode_iterator SUBDI [QI HI SI])
+(define_mode_iterator HISI [HI SI])
+(define_mode_iterator ANYI [QI HI SI (DI "TARGET_64BIT")])
+
+;; This mode iterator allows :ANYF to be used wherever a scalar or vector
+;; floating-point mode is allowed.
+(define_mode_iterator ANYF [(SF "TARGET_HARD_FLOAT")
+			    (DF "TARGET_HARD_FLOAT")])
+(define_mode_iterator ANYIF [QI HI SI (DI "TARGET_64BIT")
+			     (SF "TARGET_HARD_FLOAT")
+			     (DF "TARGET_HARD_FLOAT")])
+
+;; Like ANYF, but only applies to scalar modes.
+(define_mode_iterator SCALARF [(SF "TARGET_HARD_FLOAT")
+			       (DF "TARGET_HARD_FLOAT")])
+
+;; A floating-point mode for which moves involving FPRs may need to be split.
+(define_mode_iterator SPLITF
+  [(DF "!TARGET_64BIT")
+   (DI "!TARGET_64BIT")
+   (TF "TARGET_64BIT")])
+
+;; This attribute gives the length suffix for a sign- or zero-extension
+;; instruction.
+(define_mode_attr size [(QI "b") (HI "h")])
+
+;; Mode attributes for loads.
+(define_mode_attr load [(QI "lb") (HI "lh") (SI "lw") (DI "ld") (SF "flw") (DF "fld")])
+
+;; Instruction names for stores.
+(define_mode_attr store [(QI "sb") (HI "sh") (SI "sw") (DI "sd") (SF "fsw") (DF "fsd")])
+
+;; This attribute gives the best constraint to use for registers of
+;; a given mode.
+(define_mode_attr reg [(SI "d") (DI "d") (CC "d")])
+
+;; This attribute gives the format suffix for floating-point operations.
+(define_mode_attr fmt [(SF "s") (DF "d")])
+
+;; This attribute gives the format suffix for atomic memory operations.
+(define_mode_attr amo [(SI "w") (DI "d")])
+
+;; This attribute gives the upper-case mode name for one unit of a
+;; floating-point mode.
+(define_mode_attr UNITMODE [(SF "SF") (DF "DF")])
+
+;; This attribute gives the integer mode that has half the size of
+;; the controlling mode.
+(define_mode_attr HALFMODE [(DF "SI") (DI "SI") (TF "DI")])
+
+;; This code iterator allows signed and unsigned widening multiplications
+;; to use the same template.
+(define_code_iterator any_extend [sign_extend zero_extend])
+
+;; This code iterator allows the two right shift instructions to be
+;; generated from the same template.
+(define_code_iterator any_shiftrt [ashiftrt lshiftrt])
+
+;; This code iterator allows the three shift instructions to be generated
+;; from the same template.
+(define_code_iterator any_shift [ashift ashiftrt lshiftrt])
+
+;; This code iterator allows unsigned and signed division to be generated
+;; from the same template.
+(define_code_iterator any_div [div udiv])
+
+;; This code iterator allows unsigned and signed modulus to be generated
+;; from the same template.
+(define_code_iterator any_mod [mod umod])
+
+;; These code iterators allow the signed and unsigned scc operations to use
+;; the same template.
+(define_code_iterator any_gt [gt gtu])
+(define_code_iterator any_ge [ge geu])
+(define_code_iterator any_lt [lt ltu])
+(define_code_iterator any_le [le leu])
+
+;; <u> expands to an empty string when doing a signed operation and
+;; "u" when doing an unsigned operation.
+(define_code_attr u [(sign_extend "") (zero_extend "u")
+		     (div "") (udiv "u")
+		     (mod "") (umod "u")
+		     (gt "") (gtu "u")
+		     (ge "") (geu "u")
+		     (lt "") (ltu "u")
+		     (le "") (leu "u")])
+
+;; <su> is like <u>, but the signed form expands to "s" rather than "".
+(define_code_attr su [(sign_extend "s") (zero_extend "u")])
+
+;; <optab> expands to the name of the optab for a particular code.
+(define_code_attr optab [(ashift "ashl")
+			 (ashiftrt "ashr")
+			 (lshiftrt "lshr")
+			 (ior "ior")
+			 (xor "xor")
+			 (and "and")
+			 (plus "add")
+			 (minus "sub")])
+
+;; <insn> expands to the name of the insn that implements a particular code.
+(define_code_attr insn [(ashift "sll")
+			(ashiftrt "sra")
+			(lshiftrt "srl")
+			(ior "or")
+			(xor "xor")
+			(and "and")
+			(plus "add")
+			(minus "sub")])
+
+;; Ghost instructions produce no real code and introduce no hazards.
+;; They exist purely to express an effect on dataflow.
+(define_insn_reservation "ghost" 0
+  (eq_attr "type" "ghost")
+  "nothing")
+
+;;
+;;  ....................
+;;
+;;	ADDITION
+;;
+;;  ....................
+;;
+
+(define_insn "add<mode>3"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(plus:ANYF (match_operand:ANYF 1 "register_operand" "f")
+		   (match_operand:ANYF 2 "register_operand" "f")))]
+  ""
+  "fadd.<fmt>\t%0,%1,%2"
+  [(set_attr "type" "fadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_expand "add<mode>3"
+  [(set (match_operand:GPR 0 "register_operand")
+	(plus:GPR (match_operand:GPR 1 "register_operand")
+		  (match_operand:GPR 2 "arith_operand")))]
+  "")
+
+(define_insn "*addsi3"
+  [(set (match_operand:SI 0 "register_operand" "=r,r")
+	(plus:SI (match_operand:GPR 1 "register_operand" "r,r")
+		  (match_operand:GPR2 2 "arith_operand" "r,Q")))]
+  ""
+  { return TARGET_64BIT ? "addw\t%0,%1,%2" : "add\t%0,%1,%2"; }
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*adddi3"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+	(plus:DI (match_operand:DI 1 "register_operand" "r,r")
+		  (match_operand:DI 2 "arith_operand" "r,Q")))]
+  "TARGET_64BIT"
+  "add\t%0,%1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "DI")])
+
+(define_insn "*addsi3_extended"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+	(sign_extend:DI
+	     (plus:SI (match_operand:SI 1 "register_operand" "r,r")
+		      (match_operand:SI 2 "arith_operand" "r,Q"))))]
+  "TARGET_64BIT"
+  "addw\t%0,%1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*adddisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r,r")
+	     (plus:SI (truncate:SI (match_operand:DI 1 "register_operand" "r,r"))
+		      (truncate:SI (match_operand:DI 2 "arith_operand" "r,Q"))))]
+  "TARGET_64BIT"
+  "addw\t%0,%1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*adddisisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r,r")
+	     (plus:SI (truncate:SI (match_operand:DI 1 "register_operand" "r,r"))
+		      (match_operand:SI 2 "arith_operand" "r,Q")))]
+  "TARGET_64BIT"
+  "addw\t%0,%1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*adddi3_truncsi"
+  [(set (match_operand:SI 0 "register_operand" "=r,r")
+          (truncate:SI
+	     (plus:DI (match_operand:DI 1 "register_operand" "r,r")
+		      (match_operand:DI 2 "arith_operand" "r,Q"))))]
+  "TARGET_64BIT"
+  "addw\t%0,%1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+;;
+;;  ....................
+;;
+;;	SUBTRACTION
+;;
+;;  ....................
+;;
+
+(define_insn "sub<mode>3"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(minus:ANYF (match_operand:ANYF 1 "register_operand" "f")
+		    (match_operand:ANYF 2 "register_operand" "f")))]
+  ""
+  "fsub.<fmt>\t%0,%1,%2"
+  [(set_attr "type" "fadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_expand "sub<mode>3"
+  [(set (match_operand:GPR 0 "register_operand")
+	(minus:GPR (match_operand:GPR 1 "reg_or_0_operand")
+		   (match_operand:GPR 2 "register_operand")))]
+  "")
+
+(define_insn "*subdi3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(minus:DI (match_operand:DI 1 "reg_or_0_operand" "rJ")
+		   (match_operand:DI 2 "register_operand" "r")))]
+  "TARGET_64BIT"
+  "sub\t%0,%z1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "DI")])
+
+(define_insn "*subsi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(minus:SI (match_operand:GPR 1 "reg_or_0_operand" "rJ")
+		   (match_operand:GPR2 2 "register_operand" "r")))]
+  ""
+  { return TARGET_64BIT ? "subw\t%0,%z1,%2" : "sub\t%0,%z1,%2"; }
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*subsi3_extended"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(sign_extend:DI
+	    (minus:SI (match_operand:SI 1 "reg_or_0_operand" "rJ")
+		      (match_operand:SI 2 "register_operand" "r"))))]
+  "TARGET_64BIT"
+  "subw\t%0,%z1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "DI")])
+
+(define_insn "*subdisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	     (minus:SI (truncate:SI (match_operand:DI 1 "reg_or_0_operand" "rJ"))
+		      (truncate:SI (match_operand:DI 2 "register_operand" "r"))))]
+  "TARGET_64BIT"
+  "subw\t%0,%z1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*subdisisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	     (minus:SI (truncate:SI (match_operand:DI 1 "reg_or_0_operand" "rJ"))
+		      (match_operand:SI 2 "register_operand" "r")))]
+  "TARGET_64BIT"
+  "subw\t%0,%z1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*subsidisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	     (minus:SI (match_operand:SI 1 "reg_or_0_operand" "rJ")
+		      (truncate:SI (match_operand:DI 2 "register_operand" "r"))))]
+  "TARGET_64BIT"
+  "subw\t%0,%z1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+(define_insn "*subdi3_truncsi"
+  [(set (match_operand:SI 0 "register_operand" "=r,r")
+          (truncate:SI
+	     (minus:DI (match_operand:DI 1 "reg_or_0_operand" "rJ,r")
+		      (match_operand:DI 2 "arith_operand" "r,Q"))))]
+  "TARGET_64BIT"
+  "subw\t%0,%z1,%2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "SI")])
+
+;;
+;;  ....................
+;;
+;;	MULTIPLICATION
+;;
+;;  ....................
+;;
+
+(define_insn "mul<mode>3"
+  [(set (match_operand:SCALARF 0 "register_operand" "=f")
+	(mult:SCALARF (match_operand:SCALARF 1 "register_operand" "f")
+		      (match_operand:SCALARF 2 "register_operand" "f")))]
+  ""
+  "fmul.<fmt>\t%0,%1,%2"
+  [(set_attr "type" "fmul")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_expand "mul<mode>3"
+  [(set (match_operand:GPR 0 "register_operand")
+	(mult:GPR (match_operand:GPR 1 "reg_or_0_operand")
+		   (match_operand:GPR 2 "register_operand")))]
+  "TARGET_MULDIV")
+
+(define_insn "*mulsi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(mult:SI (match_operand:GPR 1 "register_operand" "r")
+		  (match_operand:GPR2 2 "register_operand" "r")))]
+  "TARGET_MULDIV"
+  { return TARGET_64BIT ? "mulw\t%0,%1,%2" : "mul\t%0,%1,%2"; }
+  [(set_attr "type" "imul")
+   (set_attr "mode" "SI")])
+
+(define_insn "*muldisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	     (mult:SI (truncate:SI (match_operand:DI 1 "register_operand" "r"))
+		      (truncate:SI (match_operand:DI 2 "register_operand" "r"))))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "mulw\t%0,%1,%2"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "SI")])
+
+(define_insn "*muldi3_truncsi"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+          (truncate:SI
+	     (mult:DI (match_operand:DI 1 "register_operand" "r")
+		      (match_operand:DI 2 "register_operand" "r"))))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "mulw\t%0,%1,%2"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "SI")])
+
+(define_insn "*muldi3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(mult:DI (match_operand:DI 1 "register_operand" "r")
+		  (match_operand:DI 2 "register_operand" "r")))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "mul\t%0,%1,%2"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "DI")])
+
+;;
+;;  ........................
+;;
+;;	MULTIPLICATION HIGH-PART
+;;
+;;  ........................
+;;
+
+
+;; Using a clobber here is ghetto, but I'm not smart enough to do better. '
+(define_insn_and_split "<u>mulditi3"
+  [(set (match_operand:TI 0 "register_operand" "=r")
+	(mult:TI (any_extend:TI
+		   (match_operand:DI 1 "register_operand" "r"))
+		 (any_extend:TI
+		   (match_operand:DI 2 "register_operand" "r"))))
+  (clobber (match_scratch:DI 3 "=r"))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "#"
+  "reload_completed"
+  [
+   (set (match_dup 3) (mult:DI (match_dup 1) (match_dup 2)))
+   (set (match_dup 4) (truncate:DI
+			(lshiftrt:TI
+			  (mult:TI (any_extend:TI (match_dup 1))
+				   (any_extend:TI (match_dup 2)))
+			  (const_int 64))))
+   (set (match_dup 5) (match_dup 3))
+  ]
+{
+  operands[4] = riscv_subword (operands[0], true);
+  operands[5] = riscv_subword (operands[0], false);
+}
+  )
+
+(define_insn "<u>muldi3_highpart"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(truncate:DI
+	  (lshiftrt:TI
+	    (mult:TI (any_extend:TI
+		       (match_operand:DI 1 "register_operand" "r"))
+		     (any_extend:TI
+		       (match_operand:DI 2 "register_operand" "r")))
+	    (const_int 64))))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "mulh<u>\t%0,%1,%2"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "DI")])
+
+
+(define_insn_and_split "usmulditi3"
+  [(set (match_operand:TI 0 "register_operand" "=r")
+	(mult:TI (zero_extend:TI
+		   (match_operand:DI 1 "register_operand" "r"))
+		 (sign_extend:TI
+		   (match_operand:DI 2 "register_operand" "r"))))
+  (clobber (match_scratch:DI 3 "=r"))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "#"
+  "reload_completed"
+  [
+   (set (match_dup 3) (mult:DI (match_dup 1) (match_dup 2)))
+   (set (match_dup 4) (truncate:DI
+			(lshiftrt:TI
+			  (mult:TI (zero_extend:TI (match_dup 1))
+				   (sign_extend:TI (match_dup 2)))
+			  (const_int 64))))
+   (set (match_dup 5) (match_dup 3))
+  ]
+{
+  operands[4] = riscv_subword (operands[0], true);
+  operands[5] = riscv_subword (operands[0], false);
+}
+  )
+
+(define_insn "usmuldi3_highpart"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(truncate:DI
+	  (lshiftrt:TI
+	    (mult:TI (zero_extend:TI
+		       (match_operand:DI 1 "register_operand" "r"))
+		     (sign_extend:TI
+		       (match_operand:DI 2 "register_operand" "r")))
+	    (const_int 64))))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "mulhsu\t%0,%2,%1"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "DI")])
+
+(define_expand "<u>mulsidi3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(mult:DI (any_extend:DI
+		   (match_operand:SI 1 "register_operand" "r"))
+		 (any_extend:DI
+		   (match_operand:SI 2 "register_operand" "r"))))
+  (clobber (match_scratch:SI 3 "=r"))]
+  "TARGET_MULDIV && !TARGET_64BIT"
+{
+  rtx temp = gen_reg_rtx (SImode);
+  emit_insn (gen_mulsi3 (temp, operands[1], operands[2]));
+  emit_insn (gen_<u>mulsi3_highpart (riscv_subword (operands[0], true),
+				     operands[1], operands[2]));
+  emit_insn (gen_movsi (riscv_subword (operands[0], false), temp));
+  DONE;
+}
+  )
+
+(define_insn "<u>mulsi3_highpart"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(truncate:SI
+	  (lshiftrt:DI
+	    (mult:DI (any_extend:DI
+		       (match_operand:SI 1 "register_operand" "r"))
+		     (any_extend:DI
+		       (match_operand:SI 2 "register_operand" "r")))
+	    (const_int 32))))]
+  "TARGET_MULDIV && !TARGET_64BIT"
+  "mulh<u>\t%0,%1,%2"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "SI")])
+
+
+(define_expand "usmulsidi3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(mult:DI (zero_extend:DI
+		   (match_operand:SI 1 "register_operand" "r"))
+		 (sign_extend:DI
+		   (match_operand:SI 2 "register_operand" "r"))))
+  (clobber (match_scratch:SI 3 "=r"))]
+  "TARGET_MULDIV && !TARGET_64BIT"
+{
+  rtx temp = gen_reg_rtx (SImode);
+  emit_insn (gen_mulsi3 (temp, operands[1], operands[2]));
+  emit_insn (gen_usmulsi3_highpart (riscv_subword (operands[0], true),
+				     operands[1], operands[2]));
+  emit_insn (gen_movsi (riscv_subword (operands[0], false), temp));
+  DONE;
+}
+  )
+
+(define_insn "usmulsi3_highpart"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(truncate:SI
+	  (lshiftrt:DI
+	    (mult:DI (zero_extend:DI
+		       (match_operand:SI 1 "register_operand" "r"))
+		     (sign_extend:DI
+		       (match_operand:SI 2 "register_operand" "r")))
+	    (const_int 32))))]
+  "TARGET_MULDIV && !TARGET_64BIT"
+  "mulhsu\t%0,%2,%1"
+  [(set_attr "type" "imul")
+   (set_attr "mode" "SI")])
+
+;;
+;;  ....................
+;;
+;;	DIVISION and REMAINDER
+;;
+;;  ....................
+;;
+
+(define_insn "<u>divsi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(any_div:SI (match_operand:SI 1 "register_operand" "r")
+		  (match_operand:SI 2 "register_operand" "r")))]
+  "TARGET_MULDIV"
+  { return TARGET_64BIT ? "div<u>w\t%0,%1,%2" : "div<u>\t%0,%1,%2"; }
+  [(set_attr "type" "idiv")
+   (set_attr "mode" "SI")])
+
+(define_insn "<u>divdi3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(any_div:DI (match_operand:DI 1 "register_operand" "r")
+		  (match_operand:DI 2 "register_operand" "r")))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "div<u>\t%0,%1,%2"
+  [(set_attr "type" "idiv")
+   (set_attr "mode" "DI")])
+
+(define_insn "<u>modsi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(any_mod:SI (match_operand:SI 1 "register_operand" "r")
+		  (match_operand:SI 2 "register_operand" "r")))]
+  "TARGET_MULDIV"
+  { return TARGET_64BIT ? "rem<u>w\t%0,%1,%2" : "rem<u>\t%0,%1,%2"; }
+  [(set_attr "type" "idiv")
+   (set_attr "mode" "SI")])
+
+(define_insn "<u>moddi3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(any_mod:DI (match_operand:DI 1 "register_operand" "r")
+		  (match_operand:DI 2 "register_operand" "r")))]
+  "TARGET_MULDIV && TARGET_64BIT"
+  "rem<u>\t%0,%1,%2"
+  [(set_attr "type" "idiv")
+   (set_attr "mode" "DI")])
+
+(define_insn "div<mode>3"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(div:ANYF (match_operand:ANYF 1 "register_operand" "f")
+		  (match_operand:ANYF 2 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT && TARGET_FDIV"
+  "fdiv.<fmt>\t%0,%1,%2"
+  [(set_attr "type" "fdiv")
+   (set_attr "mode" "<UNITMODE>")])
+
+;;
+;;  ....................
+;;
+;;	SQUARE ROOT
+;;
+;;  ....................
+
+(define_insn "sqrt<mode>2"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(sqrt:ANYF (match_operand:ANYF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT && TARGET_FDIV"
+{
+    return "fsqrt.<fmt>\t%0,%1";
+}
+  [(set_attr "type" "fsqrt")
+   (set_attr "mode" "<UNITMODE>")])
+
+;; Floating point multiply accumulate instructions.
+
+(define_insn "fma<mode>4"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+    (fma:ANYF
+      (match_operand:ANYF 1 "register_operand" "f")
+      (match_operand:ANYF 2 "register_operand" "f")
+      (match_operand:ANYF 3 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fmadd.<fmt>\t%0,%1,%2,%3"
+  [(set_attr "type" "fmadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_insn "fms<mode>4"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+    (fma:ANYF
+      (match_operand:ANYF 1 "register_operand" "f")
+      (match_operand:ANYF 2 "register_operand" "f")
+      (neg:ANYF (match_operand:ANYF 3 "register_operand" "f"))))]
+  "TARGET_HARD_FLOAT"
+  "fmsub.<fmt>\t%0,%1,%2,%3"
+  [(set_attr "type" "fmadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_insn "nfma<mode>4"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+    (neg:ANYF
+      (fma:ANYF
+        (match_operand:ANYF 1 "register_operand" "f")
+        (match_operand:ANYF 2 "register_operand" "f")
+        (match_operand:ANYF 3 "register_operand" "f"))))]
+  "TARGET_HARD_FLOAT"
+  "fnmadd.<fmt>\t%0,%1,%2,%3"
+  [(set_attr "type" "fmadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_insn "nfms<mode>4"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+    (neg:ANYF
+      (fma:ANYF
+        (match_operand:ANYF 1 "register_operand" "f")
+        (match_operand:ANYF 2 "register_operand" "f")
+        (neg:ANYF (match_operand:ANYF 3 "register_operand" "f")))))]
+  "TARGET_HARD_FLOAT"
+  "fnmsub.<fmt>\t%0,%1,%2,%3"
+  [(set_attr "type" "fmadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+;; modulo signed zeros, -(a*b+c) == -c-a*b
+(define_insn "*nfma<mode>4_fastmath"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+    (minus:ANYF
+      (match_operand:ANYF 3 "register_operand" "f")
+      (mult:ANYF
+        (neg:ANYF (match_operand:ANYF 1 "register_operand" "f"))
+        (match_operand:ANYF 2 "register_operand" "f"))))]
+  "TARGET_HARD_FLOAT && !HONOR_SIGNED_ZEROS (<MODE>mode)"
+  "fnmadd.<fmt>\t%0,%1,%2,%3"
+  [(set_attr "type" "fmadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+;; modulo signed zeros, -(a*b-c) == c-a*b
+(define_insn "*nfms<mode>4_fastmath"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+    (minus:ANYF
+      (match_operand:ANYF 3 "register_operand" "f")
+      (mult:ANYF
+        (match_operand:ANYF 1 "register_operand" "f")
+        (match_operand:ANYF 2 "register_operand" "f"))))]
+  "TARGET_HARD_FLOAT && !HONOR_SIGNED_ZEROS (<MODE>mode)"
+  "fnmsub.<fmt>\t%0,%1,%2,%3"
+  [(set_attr "type" "fmadd")
+   (set_attr "mode" "<UNITMODE>")])
+
+;;
+;;  ....................
+;;
+;;	ABSOLUTE VALUE
+;;
+;;  ....................
+
+(define_insn "abs<mode>2"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(abs:ANYF (match_operand:ANYF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fabs.<fmt>\t%0,%1"
+  [(set_attr "type" "fmove")
+   (set_attr "mode" "<UNITMODE>")])
+
+
+;;
+;;  ....................
+;;
+;;	MIN/MAX
+;;
+;;  ....................
+
+(define_insn "smin<mode>3"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+		   (smin:ANYF (match_operand:ANYF 1 "register_operand" "f")
+			    (match_operand:ANYF 2 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fmin.<fmt>\t%0,%1,%2"
+  [(set_attr "type" "fmove")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_insn "smax<mode>3"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+		   (smax:ANYF (match_operand:ANYF 1 "register_operand" "f")
+			    (match_operand:ANYF 2 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fmax.<fmt>\t%0,%1,%2"
+  [(set_attr "type" "fmove")
+   (set_attr "mode" "<UNITMODE>")])
+
+
+;;
+;;  ....................
+;;
+;;	NEGATION and ONE'S COMPLEMENT '
+;;
+;;  ....................
+
+(define_insn "neg<mode>2"
+  [(set (match_operand:ANYF 0 "register_operand" "=f")
+	(neg:ANYF (match_operand:ANYF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fneg.<fmt>\t%0,%1"
+  [(set_attr "type" "fmove")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_insn "one_cmpl<mode>2"
+  [(set (match_operand:GPR 0 "register_operand" "=r")
+	(not:GPR (match_operand:GPR 1 "register_operand" "r")))]
+  ""
+  "not\t%0,%1"
+  [(set_attr "type" "logical")
+   (set_attr "mode" "<MODE>")])
+
+;;
+;;  ....................
+;;
+;;	LOGICAL
+;;
+;;  ....................
+;;
+
+(define_insn "and<mode>3"
+  [(set (match_operand:GPR 0 "register_operand" "=r,r")
+	(and:GPR (match_operand:GPR 1 "register_operand" "%r,r")
+		 (match_operand:GPR 2 "arith_operand" "r,Q")))]
+  ""
+  "and\t%0,%1,%2"
+  [(set_attr "type" "logical")
+   (set_attr "mode" "<MODE>")])
+
+(define_insn "ior<mode>3"
+  [(set (match_operand:GPR 0 "register_operand" "=r,r")
+	(ior:GPR (match_operand:GPR 1 "register_operand" "%r,r")
+		 (match_operand:GPR 2 "arith_operand" "r,Q")))]
+  ""
+  "or\t%0,%1,%2"
+  [(set_attr "type" "logical")
+   (set_attr "mode" "<MODE>")])
+
+(define_insn "xor<mode>3"
+  [(set (match_operand:GPR 0 "register_operand" "=r,r")
+	(xor:GPR (match_operand:GPR 1 "register_operand" "%r,r")
+		 (match_operand:GPR 2 "arith_operand" "r,Q")))]
+  ""
+  "xor\t%0,%1,%2"
+  [(set_attr "type" "logical")
+   (set_attr "mode" "<MODE>")])
+
+;;
+;;  ....................
+;;
+;;	TRUNCATION
+;;
+;;  ....................
+
+(define_insn "truncdfsf2"
+  [(set (match_operand:SF 0 "register_operand" "=f")
+	(float_truncate:SF (match_operand:DF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.s.d\t%0,%1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "cnv_mode"	"D2S")   
+   (set_attr "mode"	"SF")])
+
+;; Integer truncation patterns.  Truncating to HImode/QImode is a no-op.
+;; Truncating from DImode to SImode is not, because we always keep SImode
+;; values sign-extended in a register so we can safely use DImode branches
+;; and comparisons on SImode values.
+
+(define_insn "truncdisi2"
+  [(set (match_operand:SI 0 "nonimmediate_operand" "=r,m")
+        (truncate:SI (match_operand:DI 1 "register_operand" "r,r")))]
+  "TARGET_64BIT"
+  "@
+    sext.w\t%0,%1
+    sw\t%1,%0"
+  [(set_attr "move_type" "arith,store")
+   (set_attr "mode" "SI")])
+
+;; Combiner patterns to optimize shift/truncate combinations.
+
+(define_insn "*ashr_trunc<mode>"
+  [(set (match_operand:SUBDI 0 "register_operand" "=r")
+        (truncate:SUBDI
+	  (ashiftrt:DI (match_operand:DI 1 "register_operand" "r")
+		       (match_operand:DI 2 "const_arith_operand" ""))))]
+  "TARGET_64BIT && IN_RANGE (INTVAL (operands[2]), 32, 63)"
+  "sra\t%0,%1,%2"
+  [(set_attr "type" "shift")
+   (set_attr "mode" "<MODE>")])
+
+(define_insn "*lshr32_trunc<mode>"
+  [(set (match_operand:SUBDI 0 "register_operand" "=r")
+        (truncate:SUBDI
+	  (lshiftrt:DI (match_operand:DI 1 "register_operand" "r")
+		       (const_int 32))))]
+  "TARGET_64BIT"
+  "sra\t%0,%1,32"
+  [(set_attr "type" "shift")
+   (set_attr "mode" "<MODE>")])
+
+;;
+;;  ....................
+;;
+;;	ZERO EXTENSION
+;;
+;;  ....................
+
+;; Extension insns.
+
+(define_insn_and_split "zero_extendsidi2"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+        (zero_extend:DI (match_operand:SI 1 "nonimmediate_operand" "r,W")))]
+  "TARGET_64BIT"
+  "@
+   #
+   lwu\t%0,%1"
+  "&& reload_completed && REG_P (operands[1])"
+  [(set (match_dup 0)
+        (ashift:DI (match_dup 1) (const_int 32)))
+   (set (match_dup 0)
+        (lshiftrt:DI (match_dup 0) (const_int 32)))]
+  { operands[1] = gen_lowpart (DImode, operands[1]); }
+  [(set_attr "move_type" "shift_shift,load")
+   (set_attr "mode" "DI")])
+
+;; Combine is not allowed to convert this insn into a zero_extendsidi2
+;; because of TRULY_NOOP_TRUNCATION.
+
+(define_insn_and_split "*clear_upper32"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+        (and:DI (match_operand:DI 1 "nonimmediate_operand" "r,W")
+		(const_int 4294967295)))]
+  "TARGET_64BIT"
+{
+  if (which_alternative == 0)
+    return "#";
+
+  operands[1] = gen_lowpart (SImode, operands[1]);
+  return "lwu\t%0,%1";
+}
+  "&& reload_completed && REG_P (operands[1])"
+  [(set (match_dup 0)
+        (ashift:DI (match_dup 1) (const_int 32)))
+   (set (match_dup 0)
+        (lshiftrt:DI (match_dup 0) (const_int 32)))]
+  ""
+  [(set_attr "move_type" "shift_shift,load")
+   (set_attr "mode" "DI")])
+
+(define_insn_and_split "zero_extendhi<GPR:mode>2"
+  [(set (match_operand:GPR 0 "register_operand" "=r,r")
+        (zero_extend:GPR (match_operand:HI 1 "nonimmediate_operand" "r,m")))]
+  ""
+  "@
+   #
+   lhu\t%0,%1"
+  "&& reload_completed && REG_P (operands[1])"
+  [(set (match_dup 0)
+        (ashift:GPR (match_dup 1) (match_dup 2)))
+   (set (match_dup 0)
+        (lshiftrt:GPR (match_dup 0) (match_dup 2)))]
+  {
+    operands[1] = gen_lowpart (<GPR:MODE>mode, operands[1]);
+    operands[2] = GEN_INT(GET_MODE_BITSIZE(<GPR:MODE>mode) - 16);
+  }
+  [(set_attr "move_type" "shift_shift,load")
+   (set_attr "mode" "<GPR:MODE>")])
+
+(define_insn "zero_extendqi<SUPERQI:mode>2"
+  [(set (match_operand:SUPERQI 0 "register_operand" "=r,r")
+        (zero_extend:SUPERQI
+	     (match_operand:QI 1 "nonimmediate_operand" "r,m")))]
+  ""
+  "@
+   and\t%0,%1,0xff
+   lbu\t%0,%1"
+  [(set_attr "move_type" "andi,load")
+   (set_attr "mode" "<SUPERQI:MODE>")])
+
+;;
+;;  ....................
+;;
+;;	SIGN EXTENSION
+;;
+;;  ....................
+
+;; Extension insns.
+;; Those for integer source operand are ordered widest source type first.
+
+;; When TARGET_64BIT, all SImode integer registers should already be in
+;; sign-extended form (see TRULY_NOOP_TRUNCATION and truncdisi2).  We can
+;; therefore get rid of register->register instructions if we constrain
+;; the source to be in the same register as the destination.
+;;
+;; The register alternative has type "arith" so that the pre-reload
+;; scheduler will treat it as a move.  This reflects what happens if
+;; the register alternative needs a reload.
+(define_insn_and_split "extendsidi2"
+  [(set (match_operand:DI 0 "register_operand" "=r,r")
+        (sign_extend:DI (match_operand:SI 1 "nonimmediate_operand" "r,m")))]
+  "TARGET_64BIT"
+  "@
+   #
+   lw\t%0,%1"
+  "&& reload_completed && register_operand (operands[1], VOIDmode)"
+  [(set (match_dup 0) (match_dup 1))]
+{
+  if (REGNO (operands[0]) == REGNO (operands[1]))
+    {
+      emit_note (NOTE_INSN_DELETED);
+      DONE;
+    }
+  operands[1] = gen_rtx_REG (DImode, REGNO (operands[1]));
+}
+  [(set_attr "move_type" "move,load")
+   (set_attr "mode" "DI")])
+
+(define_insn_and_split "extend<SHORT:mode><SUPERQI:mode>2"
+  [(set (match_operand:SUPERQI 0 "register_operand" "=r,r")
+        (sign_extend:SUPERQI
+	     (match_operand:SHORT 1 "nonimmediate_operand" "r,m")))]
+  ""
+  "@
+   #
+   l<SHORT:size>\t%0,%1"
+  "&& reload_completed && REG_P (operands[1])"
+  [(set (match_dup 0) (ashift:SI (match_dup 1) (match_dup 2)))
+   (set (match_dup 0) (ashiftrt:SI (match_dup 0) (match_dup 2)))]
+{
+  operands[0] = gen_lowpart (SImode, operands[0]);
+  operands[1] = gen_lowpart (SImode, operands[1]);
+  operands[2] = GEN_INT (GET_MODE_BITSIZE (SImode)
+			 - GET_MODE_BITSIZE (<SHORT:MODE>mode));
+}
+  [(set_attr "move_type" "shift_shift,load")
+   (set_attr "mode" "SI")])
+
+(define_insn "extendsfdf2"
+  [(set (match_operand:DF 0 "register_operand" "=f")
+	(float_extend:DF (match_operand:SF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.d.s\t%0,%1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "cnv_mode"	"S2D")   
+   (set_attr "mode"	"DF")])
+
+;;
+;;  ....................
+;;
+;;	CONVERSIONS
+;;
+;;  ....................
+
+(define_insn "fix_truncdfsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(fix:SI (match_operand:DF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.w.d %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"D2I")])
+
+
+(define_insn "fix_truncsfsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(fix:SI (match_operand:SF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.w.s %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"S2I")])
+
+
+(define_insn "fix_truncdfdi2"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(fix:DI (match_operand:DF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.l.d %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"D2I")])
+
+
+(define_insn "fix_truncsfdi2"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(fix:DI (match_operand:SF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.l.s %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"S2I")])
+
+
+(define_insn "floatsidf2"
+  [(set (match_operand:DF 0 "register_operand" "=f")
+	(float:DF (match_operand:SI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.d.w\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"I2D")])
+
+
+(define_insn "floatdidf2"
+  [(set (match_operand:DF 0 "register_operand" "=f")
+	(float:DF (match_operand:DI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.d.l\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"I2D")])
+
+
+(define_insn "floatsisf2"
+  [(set (match_operand:SF 0 "register_operand" "=f")
+	(float:SF (match_operand:SI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.s.w\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"I2S")])
+
+
+(define_insn "floatdisf2"
+  [(set (match_operand:SF 0 "register_operand" "=f")
+	(float:SF (match_operand:DI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.s.l\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"I2S")])
+
+
+(define_insn "floatunssidf2"
+  [(set (match_operand:DF 0 "register_operand" "=f")
+	(unsigned_float:DF (match_operand:SI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.d.wu\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"I2D")])
+
+
+(define_insn "floatunsdidf2"
+  [(set (match_operand:DF 0 "register_operand" "=f")
+	(unsigned_float:DF (match_operand:DI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.d.lu\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"I2D")])
+
+
+(define_insn "floatunssisf2"
+  [(set (match_operand:SF 0 "register_operand" "=f")
+	(unsigned_float:SF (match_operand:SI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.s.wu\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"I2S")])
+
+
+(define_insn "floatunsdisf2"
+  [(set (match_operand:SF 0 "register_operand" "=f")
+	(unsigned_float:SF (match_operand:DI 1 "reg_or_0_operand" "rJ")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.s.lu\t%0,%z1"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"I2S")])
+
+
+(define_insn "fixuns_truncdfsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(unsigned_fix:SI (match_operand:DF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.wu.d %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"D2I")])
+
+
+(define_insn "fixuns_truncsfsi2"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(unsigned_fix:SI (match_operand:SF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT"
+  "fcvt.wu.s %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"S2I")])
+
+
+(define_insn "fixuns_truncdfdi2"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(unsigned_fix:DI (match_operand:DF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.lu.d %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"DF")
+   (set_attr "cnv_mode"	"D2I")])
+
+
+(define_insn "fixuns_truncsfdi2"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(unsigned_fix:DI (match_operand:SF 1 "register_operand" "f")))]
+  "TARGET_HARD_FLOAT && TARGET_64BIT"
+  "fcvt.lu.s %0,%1,rtz"
+  [(set_attr "type"	"fcvt")
+   (set_attr "mode"	"SF")
+   (set_attr "cnv_mode"	"S2I")])
+
+;;
+;;  ....................
+;;
+;;	DATA MOVEMENT
+;;
+;;  ....................
+
+;; Lower-level instructions for loading an address from the GOT.
+;; We could use MEMs, but an unspec gives more optimization
+;; opportunities.
+
+(define_insn "got_load<mode>"
+   [(set (match_operand:P 0 "register_operand" "=r")
+       (unspec:P [(match_operand:P 1 "symbolic_operand" "")]
+		 UNSPEC_LOAD_GOT))]
+  "flag_pic"
+  "la\t%0,%1"
+   [(set_attr "got" "load")
+    (set_attr "mode" "<MODE>")])
+
+(define_insn "tls_add_tp_le<mode>"
+  [(set (match_operand:P 0 "register_operand" "=r")
+	(unspec:P [(match_operand:P 1 "register_operand" "r")
+		   (match_operand:P 2 "register_operand" "r")
+		   (match_operand:P 3 "symbolic_operand" "")]
+		  UNSPEC_TLS_LE))]
+  "!flag_pic || flag_pie"
+  "add\t%0,%1,%2,%%tprel_add(%3)"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "<MODE>")])
+
+(define_insn "got_load_tls_gd<mode>"
+  [(set (match_operand:P 0 "register_operand" "=r")
+       (unspec:P [(match_operand:P 1 "symbolic_operand" "")]
+                 UNSPEC_TLS_GD))]
+  "flag_pic"
+  "la.tls.gd\t%0,%1"
+  [(set_attr "got" "load")
+   (set_attr "mode" "<MODE>")])
+
+(define_insn "got_load_tls_ie<mode>"
+  [(set (match_operand:P 0 "register_operand" "=r")
+       (unspec:P [(match_operand:P 1 "symbolic_operand" "")]
+                 UNSPEC_TLS_IE))]
+  "flag_pic"
+  "la.tls.ie\t%0,%1"
+  [(set_attr "got" "load")
+   (set_attr "mode" "<MODE>")])
+
+;; Instructions for adding the low 16 bits of an address to a register.
+;; Operand 2 is the address: riscv_print_operand works out which relocation
+;; should be applied.
+
+(define_insn "*low<mode>"
+  [(set (match_operand:P 0 "register_operand" "=r")
+	(lo_sum:P (match_operand:P 1 "register_operand" "r")
+		  (match_operand:P 2 "immediate_operand" "")))]
+  ""
+  "add\t%0,%1,%R2"
+  [(set_attr "type" "arith")
+   (set_attr "mode" "<MODE>")])
+
+;; Allow combine to split complex const_int load sequences, using operand 2
+;; to store the intermediate results.  See move_operand for details.
+(define_split
+  [(set (match_operand:GPR 0 "register_operand")
+	(match_operand:GPR 1 "splittable_const_int_operand"))
+   (clobber (match_operand:GPR 2 "register_operand"))]
+  ""
+  [(const_int 0)]
+{
+  riscv_move_integer (operands[2], operands[0], INTVAL (operands[1]));
+  DONE;
+})
+
+;; Likewise, for symbolic operands.
+(define_split
+  [(set (match_operand:P 0 "register_operand")
+	(match_operand:P 1))
+   (clobber (match_operand:P 2 "register_operand"))]
+  "riscv_split_symbol (operands[2], operands[1], MAX_MACHINE_MODE, NULL)"
+  [(set (match_dup 0) (match_dup 3))]
+{
+  riscv_split_symbol (operands[2], operands[1],
+		     MAX_MACHINE_MODE, &operands[3]);
+})
+
+;; 64-bit integer moves
+
+;; Unlike most other insns, the move insns can't be split with '
+;; different predicates, because register spilling and other parts of
+;; the compiler, have memoized the insn number already.
+
+(define_expand "movdi"
+  [(set (match_operand:DI 0 "")
+	(match_operand:DI 1 ""))]
+  ""
+{
+  if (riscv_legitimize_move (DImode, operands[0], operands[1]))
+    DONE;
+})
+
+(define_insn "*movdi_32bit"
+  [(set (match_operand:DI 0 "nonimmediate_operand" "=r,r,r,m,*f,*f,*r,*m")
+	(match_operand:DI 1 "move_operand" "r,i,m,r,*J*r,*m,*f,*f"))]
+  "!TARGET_64BIT
+   && (register_operand (operands[0], DImode)
+       || reg_or_0_operand (operands[1], DImode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,const,load,store,mtc,fpload,mfc,fpstore")
+   (set_attr "mode" "DI")])
+
+(define_insn "*movdi_64bit"
+  [(set (match_operand:DI 0 "nonimmediate_operand" "=r,r,r,m,*f,*f,*r,*m")
+	(match_operand:DI 1 "move_operand" "r,T,m,rJ,*r*J,*m,*f,*f"))]
+  "TARGET_64BIT
+   && (register_operand (operands[0], DImode)
+       || reg_or_0_operand (operands[1], DImode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,const,load,store,mtc,fpload,mfc,fpstore")
+   (set_attr "mode" "DI")])
+
+;; 32-bit Integer moves
+
+;; Unlike most other insns, the move insns can't be split with
+;; different predicates, because register spilling and other parts of
+;; the compiler, have memoized the insn number already.
+
+(define_expand "mov<mode>"
+  [(set (match_operand:IMOVE32 0 "")
+	(match_operand:IMOVE32 1 ""))]
+  ""
+{
+  if (riscv_legitimize_move (<MODE>mode, operands[0], operands[1]))
+    DONE;
+})
+
+(define_insn "*mov<mode>_internal"
+  [(set (match_operand:IMOVE32 0 "nonimmediate_operand" "=r,r,r,m,*f,*f,*r,*m")
+	(match_operand:IMOVE32 1 "move_operand" "r,T,m,rJ,*r*J,*m,*f,*f"))]
+  "(register_operand (operands[0], <MODE>mode)
+    || reg_or_0_operand (operands[1], <MODE>mode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,const,load,store,mtc,fpload,mfc,fpstore")
+   (set_attr "mode" "SI")])
+
+;; 16-bit Integer moves
+
+;; Unlike most other insns, the move insns can't be split with
+;; different predicates, because register spilling and other parts of
+;; the compiler, have memoized the insn number already.
+;; Unsigned loads are used because LOAD_EXTEND_OP returns ZERO_EXTEND.
+
+(define_expand "movhi"
+  [(set (match_operand:HI 0 "")
+	(match_operand:HI 1 ""))]
+  ""
+{
+  if (riscv_legitimize_move (HImode, operands[0], operands[1]))
+    DONE;
+})
+
+(define_insn "*movhi_internal"
+  [(set (match_operand:HI 0 "nonimmediate_operand" "=r,r,r,m,*f,*r")
+	(match_operand:HI 1 "move_operand"         "r,T,m,rJ,*r*J,*f"))]
+  "(register_operand (operands[0], HImode)
+    || reg_or_0_operand (operands[1], HImode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,const,load,store,mtc,mfc")
+   (set_attr "mode" "HI")])
+
+;; HImode constant generation; see riscv_move_integer for details.
+;; si+si->hi without truncation is legal because of TRULY_NOOP_TRUNCATION.
+
+(define_insn "add<mode>hi3"
+  [(set (match_operand:HI 0 "register_operand" "=r,r")
+	(plus:HI (match_operand:HISI 1 "register_operand" "r,r")
+		  (match_operand:HISI 2 "arith_operand" "r,Q")))]
+  ""
+  { return TARGET_64BIT ? "addw\t%0,%1,%2" : "add\t%0,%1,%2"; }
+  [(set_attr "type" "arith")
+   (set_attr "mode" "HI")])
+
+(define_insn "xor<mode>hi3"
+  [(set (match_operand:HI 0 "register_operand" "=r,r")
+	(xor:HI (match_operand:HISI 1 "register_operand" "r,r")
+		  (match_operand:HISI 2 "arith_operand" "r,Q")))]
+  ""
+  "xor\t%0,%1,%2"
+  [(set_attr "type" "logical")
+   (set_attr "mode" "HI")])
+
+;; 8-bit Integer moves
+
+(define_expand "movqi"
+  [(set (match_operand:QI 0 "")
+	(match_operand:QI 1 ""))]
+  ""
+{
+  if (riscv_legitimize_move (QImode, operands[0], operands[1]))
+    DONE;
+})
+
+(define_insn "*movqi_internal"
+  [(set (match_operand:QI 0 "nonimmediate_operand" "=r,r,r,m,*f,*r")
+	(match_operand:QI 1 "move_operand"         "r,I,m,rJ,*r*J,*f"))]
+  "(register_operand (operands[0], QImode)
+    || reg_or_0_operand (operands[1], QImode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,const,load,store,mtc,mfc")
+   (set_attr "mode" "QI")])
+
+;; 32-bit floating point moves
+
+(define_expand "movsf"
+  [(set (match_operand:SF 0 "")
+	(match_operand:SF 1 ""))]
+  ""
+{
+  if (riscv_legitimize_move (SFmode, operands[0], operands[1]))
+    DONE;
+})
+
+(define_insn "*movsf_hardfloat"
+  [(set (match_operand:SF 0 "nonimmediate_operand" "=f,f,f,m,m,*f,*r,*r,*r,*m")
+	(match_operand:SF 1 "move_operand" "f,G,m,f,G,*r,*f,*G*r,*m,*r"))]
+  "TARGET_HARD_FLOAT
+   && (register_operand (operands[0], SFmode)
+       || reg_or_0_operand (operands[1], SFmode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "fmove,mtc,fpload,fpstore,store,mtc,mfc,move,load,store")
+   (set_attr "mode" "SF")])
+
+(define_insn "*movsf_softfloat"
+  [(set (match_operand:SF 0 "nonimmediate_operand" "=r,r,m")
+	(match_operand:SF 1 "move_operand" "Gr,m,r"))]
+  "TARGET_SOFT_FLOAT
+   && (register_operand (operands[0], SFmode)
+       || reg_or_0_operand (operands[1], SFmode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,load,store")
+   (set_attr "mode" "SF")])
+
+;; 64-bit floating point moves
+
+(define_expand "movdf"
+  [(set (match_operand:DF 0 "")
+	(match_operand:DF 1 ""))]
+  ""
+{
+  if (riscv_legitimize_move (DFmode, operands[0], operands[1]))
+    DONE;
+})
+
+;; In RV32, we lack mtf.d/mff.d.  Go through memory instead.
+;; (except for moving a constant 0 to an FPR.  for that we use fcvt.d.w.)
+(define_insn "*movdf_hardfloat_rv32"
+  [(set (match_operand:DF 0 "nonimmediate_operand" "=f,f,f,m,m,*r,*r,*m")
+	(match_operand:DF 1 "move_operand" "f,G,m,f,G,*r*G,*m,*r"))]
+  "!TARGET_64BIT && TARGET_HARD_FLOAT
+   && (register_operand (operands[0], DFmode)
+       || reg_or_0_operand (operands[1], DFmode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "fmove,mtc,fpload,fpstore,store,move,load,store")
+   (set_attr "mode" "DF")])
+
+(define_insn "*movdf_hardfloat_rv64"
+  [(set (match_operand:DF 0 "nonimmediate_operand" "=f,f,f,m,m,*f,*r,*r,*r,*m")
+	(match_operand:DF 1 "move_operand" "f,G,m,f,G,*r,*f,*r*G,*m,*r"))]
+  "TARGET_64BIT && TARGET_HARD_FLOAT
+   && (register_operand (operands[0], DFmode)
+       || reg_or_0_operand (operands[1], DFmode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "fmove,mtc,fpload,fpstore,store,mtc,mfc,move,load,store")
+   (set_attr "mode" "DF")])
+
+(define_insn "*movdf_softfloat"
+  [(set (match_operand:DF 0 "nonimmediate_operand" "=r,r,m")
+	(match_operand:DF 1 "move_operand" "rG,m,rG"))]
+  "TARGET_SOFT_FLOAT
+   && (register_operand (operands[0], DFmode)
+       || reg_or_0_operand (operands[1], DFmode))"
+  { return riscv_output_move (operands[0], operands[1]); }
+  [(set_attr "move_type" "move,load,store")
+   (set_attr "mode" "DF")])
+
+;; 128-bit integer moves
+
+(define_expand "movti"
+  [(set (match_operand:TI 0)
+	(match_operand:TI 1))]
+  "TARGET_64BIT"
+{
+  if (riscv_legitimize_move (TImode, operands[0], operands[1]))
+    DONE;
+})
+
+(define_insn "*movti"
+  [(set (match_operand:TI 0 "nonimmediate_operand" "=r,r,r,m")
+	(match_operand:TI 1 "move_operand" "r,i,m,rJ"))]
+  "TARGET_64BIT
+   && (register_operand (operands[0], TImode)
+       || reg_or_0_operand (operands[1], TImode))"
+  "#"
+  [(set_attr "move_type" "move,const,load,store")
+   (set_attr "mode" "TI")])
+
+(define_split
+  [(set (match_operand:MOVE64 0 "nonimmediate_operand")
+	(match_operand:MOVE64 1 "move_operand"))]
+  "reload_completed && !TARGET_64BIT
+   && riscv_split_64bit_move_p (operands[0], operands[1])"
+  [(const_int 0)]
+{
+  riscv_split_doubleword_move (operands[0], operands[1]);
+  DONE;
+})
+
+(define_split
+  [(set (match_operand:MOVE128 0 "nonimmediate_operand")
+	(match_operand:MOVE128 1 "move_operand"))]
+  "TARGET_64BIT && reload_completed"
+  [(const_int 0)]
+{
+  riscv_split_doubleword_move (operands[0], operands[1]);
+  DONE;
+})
+
+;; 64-bit paired-single floating point moves
+
+;; Load the low word of operand 0 with operand 1.
+(define_insn "load_low<mode>"
+  [(set (match_operand:SPLITF 0 "register_operand" "=f,f")
+	(unspec:SPLITF [(match_operand:<HALFMODE> 1 "general_operand" "rJ,m")]
+		       UNSPEC_LOAD_LOW))]
+  "TARGET_HARD_FLOAT"
+{
+  operands[0] = riscv_subword (operands[0], 0);
+  return riscv_output_move (operands[0], operands[1]);
+}
+  [(set_attr "move_type" "mtc,fpload")
+   (set_attr "mode" "<HALFMODE>")])
+
+;; Load the high word of operand 0 from operand 1, preserving the value
+;; in the low word.
+(define_insn "load_high<mode>"
+  [(set (match_operand:SPLITF 0 "register_operand" "=f,f")
+	(unspec:SPLITF [(match_operand:<HALFMODE> 1 "general_operand" "rJ,m")
+			(match_operand:SPLITF 2 "register_operand" "0,0")]
+		       UNSPEC_LOAD_HIGH))]
+  "TARGET_HARD_FLOAT"
+{
+  operands[0] = riscv_subword (operands[0], 1);
+  return riscv_output_move (operands[0], operands[1]);
+}
+  [(set_attr "move_type" "mtc,fpload")
+   (set_attr "mode" "<HALFMODE>")])
+
+;; Store one word of operand 1 in operand 0.  Operand 2 is 1 to store the
+;; high word and 0 to store the low word.
+(define_insn "store_word<mode>"
+  [(set (match_operand:<HALFMODE> 0 "nonimmediate_operand" "=r,m")
+	(unspec:<HALFMODE> [(match_operand:SPLITF 1 "register_operand" "f,f")
+			    (match_operand 2 "const_int_operand")]
+			   UNSPEC_STORE_WORD))]
+  "TARGET_HARD_FLOAT"
+{
+  operands[1] = riscv_subword (operands[1], INTVAL (operands[2]));
+  return riscv_output_move (operands[0], operands[1]);
+}
+  [(set_attr "move_type" "mfc,fpstore")
+   (set_attr "mode" "<HALFMODE>")])
+
+;; Expand in-line code to clear the instruction cache between operand[0] and
+;; operand[1].
+(define_expand "clear_cache"
+  [(match_operand 0 "pmode_register_operand")
+   (match_operand 1 "pmode_register_operand")]
+  ""
+  "
+{
+  emit_insn(gen_fence_i());
+  DONE;
+}")
+
+(define_insn "fence"
+  [(unspec_volatile [(const_int 0)] UNSPEC_FENCE)]
+  ""
+  "%|fence%-")
+
+(define_insn "fence_i"
+  [(unspec_volatile [(const_int 0)] UNSPEC_FENCE_I)]
+  ""
+  "fence.i")
+
+;; Block moves, see riscv.c for more details.
+;; Argument 0 is the destination
+;; Argument 1 is the source
+;; Argument 2 is the length
+;; Argument 3 is the alignment
+
+(define_expand "movmemsi"
+  [(parallel [(set (match_operand:BLK 0 "general_operand")
+		   (match_operand:BLK 1 "general_operand"))
+	      (use (match_operand:SI 2 ""))
+	      (use (match_operand:SI 3 "const_int_operand"))])]
+  "!TARGET_MEMCPY"
+{
+  if (riscv_expand_block_move (operands[0], operands[1], operands[2]))
+    DONE;
+  else
+    FAIL;
+})
+
+;;
+;;  ....................
+;;
+;;	SHIFTS
+;;
+;;  ....................
+
+(define_insn "<optab>si3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	(any_shift:SI (match_operand:SI 1 "register_operand" "r")
+		       (match_operand:SI 2 "arith_operand" "rI")))]
+  ""
+{
+  if (GET_CODE (operands[2]) == CONST_INT)
+    operands[2] = GEN_INT (INTVAL (operands[2])
+			   & (GET_MODE_BITSIZE (SImode) - 1));
+
+  return TARGET_64BIT ? "<insn>w\t%0,%1,%2" : "<insn>\t%0,%1,%2";
+}
+  [(set_attr "type" "shift")
+   (set_attr "mode" "SI")])
+
+(define_insn "*<optab>disi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	     (any_shift:SI (truncate:SI (match_operand:DI 1 "register_operand" "r"))
+		      (truncate:SI (match_operand:DI 2 "arith_operand" "rI"))))]
+  "TARGET_64BIT"
+  "<insn>w\t%0,%1,%2"
+  [(set_attr "type" "shift")
+   (set_attr "mode" "SI")])
+
+(define_insn "*ashldi3_truncsi"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+          (truncate:SI
+	     (ashift:DI (match_operand:DI 1 "register_operand" "r")
+		      (match_operand:DI 2 "const_arith_operand" "I"))))]
+  "TARGET_64BIT && INTVAL (operands[2]) < 32"
+  "sllw\t%0,%1,%2"
+  [(set_attr "type" "shift")
+   (set_attr "mode" "SI")])
+
+(define_insn "*ashldisi3"
+  [(set (match_operand:SI 0 "register_operand" "=r")
+	  (ashift:SI (match_operand:GPR 1 "register_operand" "r")
+		      (match_operand:GPR2 2 "arith_operand" "rI")))]
+  "TARGET_64BIT && (GET_CODE (operands[2]) == CONST_INT ? INTVAL (operands[2]) < 32 : 1)"
+  "sllw\t%0,%1,%2"
+  [(set_attr "type" "shift")
+   (set_attr "mode" "SI")])
+
+(define_insn "<optab>di3"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(any_shift:DI (match_operand:DI 1 "register_operand" "r")
+		       (match_operand:DI 2 "arith_operand" "rI")))]
+  "TARGET_64BIT"
+{
+  if (GET_CODE (operands[2]) == CONST_INT)
+    operands[2] = GEN_INT (INTVAL (operands[2])
+			   & (GET_MODE_BITSIZE (DImode) - 1));
+
+  return "<insn>\t%0,%1,%2";
+}
+  [(set_attr "type" "shift")
+   (set_attr "mode" "DI")])
+
+(define_insn "<optab>si3_extend"
+  [(set (match_operand:DI 0 "register_operand" "=r")
+	(sign_extend:DI
+	   (any_shift:SI (match_operand:SI 1 "register_operand" "r")
+			 (match_operand:SI 2 "arith_operand" "rI"))))]
+  "TARGET_64BIT"
+{
+  if (GET_CODE (operands[2]) == CONST_INT)
+    operands[2] = GEN_INT (INTVAL (operands[2]) & 0x1f);
+
+  return "<insn>w\t%0,%1,%2";
+}
+  [(set_attr "type" "shift")
+   (set_attr "mode" "SI")])
+
+;;
+;;  ....................
+;;
+;;	CONDITIONAL BRANCHES
+;;
+;;  ....................
+
+;; Conditional branches
+
+(define_insn "*branch_order<mode>"
+  [(set (pc)
+	(if_then_else
+	 (match_operator 1 "order_operator"
+			 [(match_operand:GPR 2 "register_operand" "r")
+			  (match_operand:GPR 3 "reg_or_0_operand" "rJ")])
+	 (label_ref (match_operand 0 "" ""))
+	 (pc)))]
+  ""
+{
+  if (GET_CODE (operands[3]) == CONST_INT)
+    return "b%C1z\t%2,%0";
+  return "b%C1\t%2,%3,%0";
+}
+  [(set_attr "type" "branch")
+   (set_attr "mode" "none")])
+
+;; Used to implement built-in functions.
+(define_expand "condjump"
+  [(set (pc)
+	(if_then_else (match_operand 0)
+		      (label_ref (match_operand 1))
+		      (pc)))])
+
+(define_expand "cbranch<mode>4"
+  [(set (pc)
+	(if_then_else (match_operator 0 "comparison_operator"
+		       [(match_operand:GPR 1 "register_operand")
+		        (match_operand:GPR 2 "nonmemory_operand")])
+		      (label_ref (match_operand 3 ""))
+		      (pc)))]
+  ""
+{
+  riscv_expand_conditional_branch (operands);
+  DONE;
+})
+
+(define_expand "cbranch<mode>4"
+  [(set (pc)
+	(if_then_else (match_operator 0 "comparison_operator"
+		       [(match_operand:SCALARF 1 "register_operand")
+		        (match_operand:SCALARF 2 "register_operand")])
+		      (label_ref (match_operand 3 ""))
+		      (pc)))]
+  ""
+{
+  riscv_expand_conditional_branch (operands);
+  DONE;
+})
+
+(define_insn_and_split "*branch_on_bit<GPR:mode>"
+  [(set (pc)
+	(if_then_else
+	 (match_operator 0 "equality_operator"
+	  [(zero_extract:GPR (match_operand:GPR 2 "register_operand" "r")
+		 (const_int 1)
+		 (match_operand 3 "branch_on_bit_operand"))
+		 (const_int 0)])
+	 (label_ref (match_operand 1))
+	 (pc)))
+   (clobber (match_scratch:GPR 4 "=&r"))]
+  ""
+  "#"
+  "reload_completed"
+  [(set (match_dup 4)
+        (ashift:GPR (match_dup 2) (match_dup 3)))
+   (set (pc)
+	(if_then_else
+	 (match_op_dup 0 [(match_dup 4) (const_int 0)])
+	 (label_ref (match_operand 1))
+	 (pc)))]
+{
+  int shift = GET_MODE_BITSIZE (<MODE>mode) - 1 - INTVAL (operands[3]);
+  operands[3] = GEN_INT (shift);
+
+  if (GET_CODE (operands[0]) == EQ)
+    operands[0] = gen_rtx_GE (<MODE>mode, operands[4], const0_rtx);
+  else
+    operands[0] = gen_rtx_LT (<MODE>mode, operands[4], const0_rtx);
+})
+
+(define_insn_and_split "*branch_on_bit_range<GPR:mode>"
+  [(set (pc)
+	(if_then_else
+	 (match_operator 0 "equality_operator"
+	  [(zero_extract:GPR (match_operand:GPR 2 "register_operand" "r")
+		 (match_operand 3 "branch_on_bit_operand")
+		 (const_int 0))
+		 (const_int 0)])
+	 (label_ref (match_operand 1))
+	 (pc)))
+   (clobber (match_scratch:GPR 4 "=&r"))]
+  ""
+  "#"
+  "reload_completed"
+  [(set (match_dup 4)
+        (ashift:GPR (match_dup 2) (match_dup 3)))
+   (set (pc)
+	(if_then_else
+	 (match_op_dup 0 [(match_dup 4) (const_int 0)])
+	 (label_ref (match_operand 1))
+	 (pc)))]
+{
+  operands[3] = GEN_INT (GET_MODE_BITSIZE (<MODE>mode) - INTVAL (operands[3]));
+})
+
+;;
+;;  ....................
+;;
+;;	SETTING A REGISTER FROM A COMPARISON
+;;
+;;  ....................
+
+;; Destination is always set in SI mode.
+
+(define_expand "cstore<mode>4"
+  [(set (match_operand:SI 0 "register_operand")
+	(match_operator:SI 1 "order_operator"
+	 [(match_operand:GPR 2 "register_operand")
+	  (match_operand:GPR 3 "nonmemory_operand")]))]
+  ""
+{
+  riscv_expand_scc (operands);
+  DONE;
+})
+
+(define_insn "cstore<mode>4"
+   [(set (match_operand:SI 0 "register_operand" "=r")
+        (match_operator:SI 1 "fp_order_operator"
+	      [(match_operand:SCALARF 2 "register_operand" "f")
+	       (match_operand:SCALARF 3 "register_operand" "f")]))]
+  "TARGET_HARD_FLOAT"
+{
+  if (GET_CODE (operands[1]) == NE)
+    return "feq.<fmt>\t%0,%2,%3; seqz %0, %0";
+  return "f%C1.<fmt>\t%0,%2,%3";
+}
+  [(set_attr "type" "fcmp")
+   (set_attr "mode" "<UNITMODE>")])
+
+(define_insn "*seq_zero_<GPR:mode><GPR2:mode>"
+  [(set (match_operand:GPR2 0 "register_operand" "=r")
+	(eq:GPR2 (match_operand:GPR 1 "register_operand" "r")
+		 (const_int 0)))]
+  ""
+  "seqz\t%0,%1"
+  [(set_attr "type" "slt")
+   (set_attr "mode" "<GPR:MODE>")])
+
+(define_insn "*sne_zero_<GPR:mode><GPR2:mode>"
+  [(set (match_operand:GPR2 0 "register_operand" "=r")
+	(ne:GPR2 (match_operand:GPR 1 "register_operand" "r")
+		 (const_int 0)))]
+  ""
+  "snez\t%0,%1"
+  [(set_attr "type" "slt")
+   (set_attr "mode" "<GPR:MODE>")])
+
+(define_insn "*sgt<u>_<GPR:mode><GPR2:mode>"
+  [(set (match_operand:GPR2 0 "register_operand" "=r")
+	(any_gt:GPR2 (match_operand:GPR 1 "register_operand" "r")
+		     (match_operand:GPR 2 "reg_or_0_operand" "rJ")))]
+  ""
+  "slt<u>\t%0,%z2,%1"
+  [(set_attr "type" "slt")
+   (set_attr "mode" "<GPR:MODE>")])
+
+(define_insn "*sge<u>_<GPR:mode><GPR2:mode>"
+  [(set (match_operand:GPR2 0 "register_operand" "=r")
+	(any_ge:GPR2 (match_operand:GPR 1 "register_operand" "r")
+		     (const_int 1)))]
+  ""
+  "slt<u>\t%0,zero,%1"
+  [(set_attr "type" "slt")
+   (set_attr "mode" "<GPR:MODE>")])
+
+(define_insn "*slt<u>_<GPR:mode><GPR2:mode>"
+  [(set (match_operand:GPR2 0 "register_operand" "=r")
+	(any_lt:GPR2 (match_operand:GPR 1 "register_operand" "r")
+		     (match_operand:GPR 2 "arith_operand" "rI")))]
+  ""
+  "slt<u>\t%0,%1,%2"
+  [(set_attr "type" "slt")
+   (set_attr "mode" "<GPR:MODE>")])
+
+(define_insn "*sle<u>_<GPR:mode><GPR2:mode>"
+  [(set (match_operand:GPR2 0 "register_operand" "=r")
+	(any_le:GPR2 (match_operand:GPR 1 "register_operand" "r")
+		     (match_operand:GPR 2 "sle_operand" "")))]
+  ""
+{
+  operands[2] = GEN_INT (INTVAL (operands[2]) + 1);
+  return "slt<u>\t%0,%1,%2";
+}
+  [(set_attr "type" "slt")
+   (set_attr "mode" "<GPR:MODE>")])
+
+;;
+;;  ....................
+;;
+;;	UNCONDITIONAL BRANCHES
+;;
+;;  ....................
+
+;; Unconditional branches.
+
+(define_insn "jump"
+  [(set (pc)
+	(label_ref (match_operand 0 "" "")))]
+  ""
+  "j\t%l0"
+  [(set_attr "type"	"jump")
+   (set_attr "mode"	"none")])
+
+(define_expand "indirect_jump"
+  [(set (pc) (match_operand 0 "register_operand"))]
+  ""
+{
+  operands[0] = force_reg (Pmode, operands[0]);
+  if (Pmode == SImode)
+    emit_jump_insn (gen_indirect_jumpsi (operands[0]));
+  else
+    emit_jump_insn (gen_indirect_jumpdi (operands[0]));
+  DONE;
+})
+
+(define_insn "indirect_jump<mode>"
+  [(set (pc) (match_operand:P 0 "register_operand" "l"))]
+  ""
+  "jr\t%0"
+  [(set_attr "type" "jump")
+   (set_attr "mode" "none")])
+
+(define_expand "tablejump"
+  [(set (pc) (match_operand 0 "register_operand" ""))
+	      (use (label_ref (match_operand 1 "" "")))]
+  ""
+{
+  if (CASE_VECTOR_PC_RELATIVE)
+      operands[0] = expand_simple_binop (Pmode, PLUS, operands[0],
+					 gen_rtx_LABEL_REF (Pmode, operands[1]),
+					 NULL_RTX, 0, OPTAB_DIRECT);
+
+  if (CASE_VECTOR_PC_RELATIVE && Pmode == DImode)
+    emit_jump_insn (gen_tablejumpdi (operands[0], operands[1]));
+  else
+    emit_jump_insn (gen_tablejumpsi (operands[0], operands[1]));
+  DONE;
+})
+
+(define_insn "tablejump<mode>"
+  [(set (pc) (match_operand:GPR 0 "register_operand" "l"))
+   (use (label_ref (match_operand 1 "" "")))]
+  ""
+  "jr\t%0"
+  [(set_attr "type" "jump")
+   (set_attr "mode" "none")])
+
+;;
+;;  ....................
+;;
+;;	Function prologue/epilogue
+;;
+;;  ....................
+;;
+
+(define_expand "prologue"
+  [(const_int 1)]
+  ""
+{
+  riscv_expand_prologue ();
+  DONE;
+})
+
+;; Block any insns from being moved before this point, since the
+;; profiling call to mcount can use various registers that aren't
+;; saved or used to pass arguments.
+
+(define_insn "blockage"
+  [(unspec_volatile [(const_int 0)] UNSPEC_BLOCKAGE)]
+  ""
+  ""
+  [(set_attr "type" "ghost")
+   (set_attr "mode" "none")])
+
+(define_expand "epilogue"
+  [(const_int 2)]
+  ""
+{
+  riscv_expand_epilogue (false);
+  DONE;
+})
+
+(define_expand "sibcall_epilogue"
+  [(const_int 2)]
+  ""
+{
+  riscv_expand_epilogue (true);
+  DONE;
+})
+
+;; Trivial return.  Make it look like a normal return insn as that
+;; allows jump optimizations to work better.
+
+(define_expand "return"
+  [(simple_return)]
+  "riscv_can_use_return_insn ()"
+  "")
+
+(define_insn "simple_return"
+  [(simple_return)]
+  ""
+  "ret"
+  [(set_attr "type"	"jump")
+   (set_attr "mode"	"none")])
+
+;; Normal return.
+
+(define_insn "simple_return_internal"
+  [(simple_return)
+   (use (match_operand 0 "pmode_register_operand" ""))]
+  ""
+  "jr\t%0"
+  [(set_attr "type"	"jump")
+   (set_attr "mode"	"none")])
+
+;; This is used in compiling the unwind routines.
+(define_expand "eh_return"
+  [(use (match_operand 0 "general_operand"))]
+  ""
+{
+  if (GET_MODE (operands[0]) != word_mode)
+    operands[0] = convert_to_mode (word_mode, operands[0], 0);
+  if (TARGET_64BIT)
+    emit_insn (gen_eh_set_lr_di (operands[0]));
+  else
+    emit_insn (gen_eh_set_lr_si (operands[0]));
+  DONE;
+})
+
+;; Clobber the return address on the stack.  We can't expand this
+;; until we know where it will be put in the stack frame.
+
+(define_insn "eh_set_lr_si"
+  [(unspec [(match_operand:SI 0 "register_operand" "r")] UNSPEC_EH_RETURN)
+   (clobber (match_scratch:SI 1 "=&r"))]
+  "! TARGET_64BIT"
+  "#")
+
+(define_insn "eh_set_lr_di"
+  [(unspec [(match_operand:DI 0 "register_operand" "r")] UNSPEC_EH_RETURN)
+   (clobber (match_scratch:DI 1 "=&r"))]
+  "TARGET_64BIT"
+  "#")
+
+(define_split
+  [(unspec [(match_operand 0 "register_operand")] UNSPEC_EH_RETURN)
+   (clobber (match_scratch 1))]
+  "reload_completed"
+  [(const_int 0)]
+{
+  riscv_set_return_address (operands[0], operands[1]);
+  DONE;
+})
+
+;;
+;;  ....................
+;;
+;;	FUNCTION CALLS
+;;
+;;  ....................
+
+;; Sibling calls.  All these patterns use jump instructions.
+
+;; call_insn_operand will only accept constant
+;; addresses if a direct jump is acceptable.  Since the 'S' constraint
+;; is defined in terms of call_insn_operand, the same is true of the
+;; constraints.
+
+;; When we use an indirect jump, we need a register that will be
+;; preserved by the epilogue (constraint j).
+
+(define_expand "sibcall"
+  [(parallel [(call (match_operand 0 "")
+		    (match_operand 1 ""))
+	      (use (match_operand 2 ""))	;; next_arg_reg
+	      (use (match_operand 3 ""))])]	;; struct_value_size_rtx
+  ""
+{
+  riscv_expand_call (true, NULL_RTX, XEXP (operands[0], 0), operands[1]);
+  DONE;
+})
+
+(define_insn "sibcall_internal"
+  [(call (mem:SI (match_operand 0 "call_insn_operand" "j,S"))
+	 (match_operand 1 "" ""))]
+  "SIBLING_CALL_P (insn)"
+  { return REG_P (operands[0]) ? "jr\t%0"
+	   : absolute_symbolic_operand (operands[0], VOIDmode) ? "tail\t%0"
+	   : "tail\t%0@"; }
+  [(set_attr "type" "call")])
+
+(define_expand "sibcall_value"
+  [(parallel [(set (match_operand 0 "")
+		   (call (match_operand 1 "")
+			 (match_operand 2 "")))
+	      (use (match_operand 3 ""))])]		;; next_arg_reg
+  ""
+{
+  riscv_expand_call (true, operands[0], XEXP (operands[1], 0), operands[2]);
+  DONE;
+})
+
+(define_insn "sibcall_value_internal"
+  [(set (match_operand 0 "register_operand" "")
+        (call (mem:SI (match_operand 1 "call_insn_operand" "j,S"))
+              (match_operand 2 "" "")))]
+  "SIBLING_CALL_P (insn)"
+  { return REG_P (operands[1]) ? "jr\t%1"
+	   : absolute_symbolic_operand (operands[1], VOIDmode) ? "tail\t%1"
+	   : "tail\t%1@"; }
+  [(set_attr "type" "call")])
+
+(define_insn "sibcall_value_multiple_internal"
+  [(set (match_operand 0 "register_operand" "")
+        (call (mem:SI (match_operand 1 "call_insn_operand" "j,S"))
+              (match_operand 2 "" "")))
+   (set (match_operand 3 "register_operand" "")
+	(call (mem:SI (match_dup 1))
+	      (match_dup 2)))]
+  "SIBLING_CALL_P (insn)"
+  { return REG_P (operands[1]) ? "jr\t%1"
+	   : absolute_symbolic_operand (operands[1], VOIDmode) ? "tail\t%1"
+	   : "tail\t%1@"; }
+  [(set_attr "type" "call")])
+
+(define_expand "call"
+  [(parallel [(call (match_operand 0 "")
+		    (match_operand 1 ""))
+	      (use (match_operand 2 ""))	;; next_arg_reg
+	      (use (match_operand 3 ""))])]	;; struct_value_size_rtx
+  ""
+{
+  riscv_expand_call (false, NULL_RTX, XEXP (operands[0], 0), operands[1]);
+  DONE;
+})
+
+(define_insn "call_internal"
+  [(call (mem:SI (match_operand 0 "call_insn_operand" "l,S"))
+	 (match_operand 1 "" ""))
+   (clobber (reg:SI RETURN_ADDR_REGNUM))]
+  ""
+  { return REG_P (operands[0]) ? "jalr\t%0"
+	   : absolute_symbolic_operand (operands[0], VOIDmode) ? "call\t%0"
+	   : "call\t%0@"; }
+  [(set_attr "type" "call")])
+
+(define_expand "call_value"
+  [(parallel [(set (match_operand 0 "")
+		   (call (match_operand 1 "")
+			 (match_operand 2 "")))
+	      (use (match_operand 3 ""))])]		;; next_arg_reg
+  ""
+{
+  riscv_expand_call (false, operands[0], XEXP (operands[1], 0), operands[2]);
+  DONE;
+})
+
+;; See comment for call_internal.
+(define_insn "call_value_internal"
+  [(set (match_operand 0 "register_operand" "")
+        (call (mem:SI (match_operand 1 "call_insn_operand" "l,S"))
+              (match_operand 2 "" "")))
+   (clobber (reg:SI RETURN_ADDR_REGNUM))]
+  ""
+  { return REG_P (operands[1]) ? "jalr\t%1"
+	   : absolute_symbolic_operand (operands[1], VOIDmode) ? "call\t%1"
+	   : "call\t%1@"; }
+  [(set_attr "type" "call")])
+
+;; See comment for call_internal.
+(define_insn "call_value_multiple_internal"
+  [(set (match_operand 0 "register_operand" "")
+        (call (mem:SI (match_operand 1 "call_insn_operand" "l,S"))
+              (match_operand 2 "" "")))
+   (set (match_operand 3 "register_operand" "")
+	(call (mem:SI (match_dup 1))
+	      (match_dup 2)))
+   (clobber (reg:SI RETURN_ADDR_REGNUM))]
+  ""
+  { return REG_P (operands[1]) ? "jalr\t%1"
+	   : absolute_symbolic_operand (operands[1], VOIDmode) ? "call\t%1"
+	   : "call\t%1@"; }
+  [(set_attr "type" "call")])
+
+;; Call subroutine returning any type.
+
+(define_expand "untyped_call"
+  [(parallel [(call (match_operand 0 "")
+		    (const_int 0))
+	      (match_operand 1 "")
+	      (match_operand 2 "")])]
+  ""
+{
+  int i;
+
+  emit_call_insn (GEN_CALL (operands[0], const0_rtx, NULL, const0_rtx));
+
+  for (i = 0; i < XVECLEN (operands[2], 0); i++)
+    {
+      rtx set = XVECEXP (operands[2], 0, i);
+      riscv_emit_move (SET_DEST (set), SET_SRC (set));
+    }
+
+  emit_insn (gen_blockage ());
+  DONE;
+})
+
+(define_insn "nop"
+  [(const_int 0)]
+  ""
+  "nop"
+  [(set_attr "type"	"nop")
+   (set_attr "mode"	"none")])
+
+(define_insn "trap"
+  [(trap_if (const_int 1) (const_int 0))]
+  ""
+  "sbreak")
+
+(define_insn "gpr_save"
+  [(unspec_volatile [(match_operand 0 "const_int_operand")] UNSPEC_GPR_SAVE)
+   (clobber (reg:SI T0_REGNUM))
+   (clobber (reg:SI T1_REGNUM))]
+  ""
+  { return riscv_output_gpr_save (INTVAL (operands[0])); })
+
+(define_insn "gpr_restore"
+  [(unspec_volatile [(match_operand 0 "const_int_operand")] UNSPEC_GPR_RESTORE)]
+  ""
+  "tail\t__riscv_restore_%0")
+
+(define_insn "gpr_restore_return"
+  [(return)
+   (use (match_operand 0 "pmode_register_operand" ""))
+   (const_int 0)]
+  ""
+  "")
+
+(include "sync.md")
+(include "peephole.md")
+(include "generic.md")
diff -urN empty/gcc/config/riscv/riscv-modes.def gcc-5.3.0/gcc/config/riscv/riscv-modes.def
--- empty/gcc/config/riscv/riscv-modes.def	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv-modes.def	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,26 @@
+/* Extra machine modes for RISC-V target.
+   Copyright (C) 2011-2014 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+   Based on MIPS target for GNU compiler.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+FLOAT_MODE (TF, 16, ieee_quad_format);
+
+/* Vector modes.  */
+VECTOR_MODES (INT, 4);        /*       V8QI V4HI V2SI */
+VECTOR_MODES (FLOAT, 4);      /*            V4HF V2SF */
diff -urN empty/gcc/config/riscv/riscv.opt gcc-5.3.0/gcc/config/riscv/riscv.opt
--- empty/gcc/config/riscv/riscv.opt	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv.opt	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,87 @@
+; Options for the MIPS port of the compiler
+;
+; Copyright (C) 2005, 2007, 2008, 2010, 2011 Free Software Foundation, Inc.
+;
+; This file is part of GCC.
+;
+; GCC is free software; you can redistribute it and/or modify it under
+; the terms of the GNU General Public License as published by the Free
+; Software Foundation; either version 3, or (at your option) any later
+; version.
+;
+; GCC is distributed in the hope that it will be useful, but WITHOUT
+; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+; License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with GCC; see the file COPYING3.  If not see
+; <http://www.gnu.org/licenses/>.
+
+m32
+Target RejectNegative Mask(32BIT)
+Generate RV32 code
+
+m64
+Target RejectNegative InverseMask(32BIT, 64BIT)
+Generate RV64 code
+
+mbranch-cost=
+Target RejectNegative Joined UInteger Var(riscv_branch_cost)
+-mbranch-cost=COST	Set the cost of branches to roughly COST instructions
+
+mhard-float
+Target Report RejectNegative InverseMask(SOFT_FLOAT_ABI, HARD_FLOAT_ABI)
+Allow the use of hardware floating-point ABI and instructions
+
+mmemcpy
+Target Report Mask(MEMCPY)
+Don't optimize block moves
+
+mplt
+Target Report Var(TARGET_PLT) Init(1)
+When generating -fpic code, allow the use of PLTs. Ignored for fno-pic.
+
+msoft-float
+Target Report RejectNegative Mask(SOFT_FLOAT_ABI)
+Prevent the use of all hardware floating-point instructions
+
+mno-fdiv
+Target Report RejectNegative Mask(NO_FDIV)
+Don't use hardware floating-point divide and square root instructions
+
+mfdiv
+Target Report RejectNegative InverseMask(NO_FDIV, FDIV)
+Use hardware floating-point divide and square root instructions
+
+march=
+Target RejectNegative Joined Var(riscv_arch_string)
+-march=			Generate code for given RISC-V ISA (e.g. RV64IM)
+
+mtune=
+Target RejectNegative Joined Var(riscv_tune_string)
+-mtune=PROCESSOR	Optimize the output for PROCESSOR
+
+msmall-data-limit=
+Target Joined Separate UInteger Var(g_switch_value) Init(8)
+-msmall-data-limit=<number>	Put global and static data smaller than <number> bytes into a special section (on some targets)
+
+matomic
+Target Report Mask(ATOMIC)
+Use hardware atomic memory instructions.
+
+mmuldiv
+Target Report Mask(MULDIV)
+Use hardware instructions for integer multiplication and division.
+
+mrvc
+Target Report Mask(RVC)
+Use compressed instruction encoding
+
+msave-restore
+Target Report Mask(SAVE_RESTORE)
+Use smaller but slower prologue and epilogue code
+
+mcmodel=
+Target RejectNegative Joined Var(riscv_cmodel_string)
+Use given RISC-V code model (medlow or medany)
diff -urN empty/gcc/config/riscv/riscv-protos.h gcc-5.3.0/gcc/config/riscv/riscv-protos.h
--- empty/gcc/config/riscv/riscv-protos.h	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/riscv-protos.h	2016-04-02 14:07:12.469104719 +0800
@@ -0,0 +1,94 @@
+/* Definition of RISC-V target for GNU compiler.
+   Copyright (C) 2011-2014 Free Software Foundation, Inc.
+   Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+   Based on MIPS target for GNU compiler.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_RISCV_PROTOS_H
+#define GCC_RISCV_PROTOS_H
+
+enum riscv_symbol_type {
+  SYMBOL_ABSOLUTE,
+  SYMBOL_GOT_DISP,
+  SYMBOL_TLS,
+  SYMBOL_TLS_LE,
+  SYMBOL_TLS_IE,
+  SYMBOL_TLS_GD
+};
+#define NUM_SYMBOL_TYPES (SYMBOL_TLS_GD + 1)
+
+enum riscv_code_model {
+  CM_MEDLOW,
+  CM_MEDANY,
+  CM_PIC
+};
+extern enum riscv_code_model riscv_cmodel;
+
+extern bool riscv_symbolic_constant_p (rtx, enum riscv_symbol_type *);
+extern int riscv_regno_mode_ok_for_base_p (int, enum machine_mode, bool);
+extern int riscv_address_insns (rtx, enum machine_mode, bool);
+extern int riscv_const_insns (rtx);
+extern int riscv_split_const_insns (rtx);
+extern int riscv_load_store_insns (rtx, rtx_insn *);
+extern rtx riscv_emit_move (rtx, rtx);
+extern bool riscv_split_symbol (rtx, rtx, enum machine_mode, rtx *);
+extern rtx riscv_unspec_address (rtx, enum riscv_symbol_type);
+extern void riscv_move_integer (rtx, rtx, HOST_WIDE_INT);
+extern bool riscv_legitimize_move (enum machine_mode, rtx, rtx);
+extern bool riscv_legitimize_vector_move (enum machine_mode, rtx, rtx);
+
+extern rtx riscv_subword (rtx, bool);
+extern bool riscv_split_64bit_move_p (rtx, rtx);
+extern void riscv_split_doubleword_move (rtx, rtx);
+extern const char *riscv_output_move (rtx, rtx);
+extern const char *riscv_output_gpr_save (unsigned);
+#ifdef RTX_CODE
+extern void riscv_expand_scc (rtx *);
+extern void riscv_expand_conditional_branch (rtx *);
+#endif
+extern rtx riscv_expand_call (bool, rtx, rtx, rtx);
+extern void riscv_expand_fcc_reload (rtx, rtx, rtx);
+extern void riscv_set_return_address (rtx, rtx);
+extern bool riscv_expand_block_move (rtx, rtx, rtx);
+extern void riscv_expand_synci_loop (rtx, rtx);
+
+extern bool riscv_expand_ext_as_unaligned_load (rtx, rtx, HOST_WIDE_INT,
+					       HOST_WIDE_INT);
+extern bool riscv_expand_ins_as_unaligned_store (rtx, rtx, HOST_WIDE_INT,
+						HOST_WIDE_INT);
+extern void riscv_order_regs_for_local_alloc (void);
+
+extern rtx riscv_return_addr (int, rtx);
+extern HOST_WIDE_INT riscv_initial_elimination_offset (int, int);
+extern void riscv_expand_prologue (void);
+extern void riscv_expand_epilogue (bool);
+extern bool riscv_can_use_return_insn (void);
+extern rtx riscv_function_value (const_tree, const_tree, enum machine_mode);
+
+extern enum reg_class riscv_secondary_reload_class (enum reg_class,
+						   enum machine_mode,
+						   rtx, bool);
+extern unsigned int riscv_hard_regno_nregs (int, enum machine_mode);
+
+extern void irix_asm_output_align (FILE *, unsigned);
+extern const char *current_section_name (void);
+extern unsigned int current_section_flags (void);
+
+extern void riscv_expand_vector_init (rtx, rtx);
+
+#endif /* ! GCC_RISCV_PROTOS_H */
diff -urN empty/gcc/config/riscv/sync.md gcc-5.3.0/gcc/config/riscv/sync.md
--- empty/gcc/config/riscv/sync.md	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/sync.md	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,204 @@
+;; Machine description for RISC-V atomic operations.
+;; Copyright (C) 2011-2014 Free Software Foundation, Inc.
+;; Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.
+;; Based on MIPS target for GNU compiler.
+
+;; This file is part of GCC.
+
+;; GCC is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; GCC is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.
+
+(define_c_enum "unspec" [
+  UNSPEC_COMPARE_AND_SWAP
+  UNSPEC_SYNC_OLD_OP
+  UNSPEC_SYNC_EXCHANGE
+  UNSPEC_ATOMIC_STORE
+  UNSPEC_MEMORY_BARRIER
+])
+
+(define_code_iterator any_atomic [plus ior xor and])
+(define_code_attr atomic_optab
+  [(plus "add") (ior "or") (xor "xor") (and "and")])
+
+;; Memory barriers.
+
+(define_expand "mem_thread_fence"
+  [(match_operand:SI 0 "const_int_operand" "")] ;; model
+  ""
+{
+  if (INTVAL (operands[0]) != MEMMODEL_RELAXED)
+    {
+      rtx mem = gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (Pmode));
+      MEM_VOLATILE_P (mem) = 1;
+      emit_insn (gen_mem_thread_fence_1 (mem, operands[0]));
+    }
+  DONE;
+})
+
+(define_insn "mem_thread_fence_1"
+  [(set (match_operand:BLK 0 "" "")
+	(unspec:BLK [(match_dup 0)] UNSPEC_MEMORY_BARRIER))
+   (match_operand:SI 1 "const_int_operand" "")] ;; model
+  ""
+{
+  long model = INTVAL (operands[1]);
+
+  switch (model)
+    {
+    case MEMMODEL_SEQ_CST:
+    case MEMMODEL_SYNC_SEQ_CST:
+    case MEMMODEL_ACQ_REL:
+      return "fence rw,rw";
+    case MEMMODEL_ACQUIRE:
+    case MEMMODEL_SYNC_ACQUIRE:
+    case MEMMODEL_CONSUME:
+      return "fence r,rw";
+    case MEMMODEL_RELEASE:
+    case MEMMODEL_SYNC_RELEASE:
+      return "fence rw,w";
+    default:
+      fprintf(stderr, "mem_thread_fence_1(%ld)\n", model);
+      gcc_unreachable();
+    }
+})
+
+;; Atomic memory operations.
+
+;; Implement atomic stores with amoswap.  Fall back to fences for atomic loads.
+(define_insn "atomic_store<mode>"
+  [(set (match_operand:GPR 0 "memory_operand" "=A")
+    (unspec_volatile:GPR
+      [(match_operand:GPR 1 "reg_or_0_operand" "rJ")
+       (match_operand:SI 2 "const_int_operand")]      ;; model
+      UNSPEC_ATOMIC_STORE))]
+  "TARGET_ATOMIC"
+  "amoswap.<amo>%A2 zero,%z1,%0")
+
+(define_insn "atomic_<atomic_optab><mode>"
+  [(set (match_operand:GPR 0 "memory_operand" "+A")
+	(unspec_volatile:GPR
+	  [(any_atomic:GPR (match_dup 0)
+		     (match_operand:GPR 1 "reg_or_0_operand" "rJ"))
+	   (match_operand:SI 2 "const_int_operand")] ;; model
+	 UNSPEC_SYNC_OLD_OP))]
+  "TARGET_ATOMIC"
+  "amo<insn>.<amo>%A2 zero,%z1,%0")
+
+(define_insn "atomic_fetch_<atomic_optab><mode>"
+  [(set (match_operand:GPR 0 "register_operand" "=&r")
+	(match_operand:GPR 1 "memory_operand" "+A"))
+   (set (match_dup 1)
+	(unspec_volatile:GPR
+	  [(any_atomic:GPR (match_dup 1)
+		     (match_operand:GPR 2 "reg_or_0_operand" "rJ"))
+	   (match_operand:SI 3 "const_int_operand")] ;; model
+	 UNSPEC_SYNC_OLD_OP))]
+  "TARGET_ATOMIC"
+  "amo<insn>.<amo>%A3 %0,%z2,%1")
+
+(define_insn "atomic_exchange<mode>"
+  [(set (match_operand:GPR 0 "register_operand" "=&r")
+	(unspec_volatile:GPR
+	  [(match_operand:GPR 1 "memory_operand" "+A")
+	   (match_operand:SI 3 "const_int_operand")] ;; model
+	  UNSPEC_SYNC_EXCHANGE))
+   (set (match_dup 1)
+        (match_operand:GPR 2 "register_operand" "0"))]
+  "TARGET_ATOMIC"
+  "amoswap.<amo>%A3 %0,%z2,%1")
+
+(define_insn "atomic_cas_value_strong<mode>"
+  [(set (match_operand:GPR 0 "register_operand" "=&r")
+	(match_operand:GPR 1 "memory_operand" "+A"))
+   (set (match_dup 1)
+	(unspec_volatile:GPR [(match_operand:GPR 2 "reg_or_0_operand" "rJ")
+			      (match_operand:GPR 3 "reg_or_0_operand" "rJ")
+			      (match_operand:SI 4 "const_int_operand")  ;; mod_s
+			      (match_operand:SI 5 "const_int_operand")] ;; mod_f
+	 UNSPEC_COMPARE_AND_SWAP))
+   (clobber (match_scratch:GPR 6 "=&r"))]
+  "TARGET_ATOMIC"
+  "1: lr.<amo>%A5 %0,%1; bne %0,%z2,1f; sc.<amo>%A4 %6,%z3,%1; bnez %6,1b; 1:"
+  [(set (attr "length") (const_int 16))])
+
+(define_expand "atomic_compare_and_swap<mode>"
+  [(match_operand:SI 0 "register_operand" "")   ;; bool output
+   (match_operand:GPR 1 "register_operand" "")  ;; val output
+   (match_operand:GPR 2 "memory_operand" "")    ;; memory
+   (match_operand:GPR 3 "reg_or_0_operand" "")  ;; expected value
+   (match_operand:GPR 4 "reg_or_0_operand" "")  ;; desired value
+   (match_operand:SI 5 "const_int_operand" "")  ;; is_weak
+   (match_operand:SI 6 "const_int_operand" "")  ;; mod_s
+   (match_operand:SI 7 "const_int_operand" "")] ;; mod_f
+  "TARGET_ATOMIC"
+{
+  emit_insn (gen_atomic_cas_value_strong<mode> (operands[1], operands[2],
+						operands[3], operands[4],
+						operands[6], operands[7]));
+
+  rtx compare = operands[1];
+  if (operands[3] != const0_rtx)
+    {
+      rtx difference = gen_rtx_MINUS (<MODE>mode, operands[1], operands[3]);
+      compare = gen_reg_rtx (<MODE>mode);
+      emit_insn (gen_rtx_SET (VOIDmode, compare, difference));
+    }
+
+  rtx eq = gen_rtx_EQ (<MODE>mode, compare, const0_rtx);
+  rtx result = gen_reg_rtx (<MODE>mode);
+  emit_insn (gen_rtx_SET (VOIDmode, result, eq));
+  emit_insn (gen_rtx_SET (VOIDmode, operands[0], gen_lowpart (SImode, result)));
+  DONE;
+})
+
+(define_expand "atomic_test_and_set"
+  [(match_operand:QI 0 "register_operand" "")     ;; bool output
+   (match_operand:QI 1 "memory_operand" "+A")    ;; memory
+   (match_operand:SI 2 "const_int_operand" "")]   ;; model
+  "TARGET_ATOMIC"
+{
+  /* We have no QImode atomics, so use the address LSBs to form a mask,
+     then use an aligned SImode atomic. */
+  rtx result = operands[0];
+  rtx mem = operands[1];
+  rtx model = operands[2];
+  rtx addr = force_reg (Pmode, XEXP (mem, 0));
+
+  rtx aligned_addr = gen_reg_rtx (Pmode);
+  emit_move_insn (aligned_addr, gen_rtx_AND (Pmode, addr, GEN_INT (-4)));
+
+  rtx aligned_mem = change_address (mem, SImode, aligned_addr);
+  set_mem_alias_set (aligned_mem, 0);
+
+  rtx offset = gen_reg_rtx (SImode);
+  emit_move_insn (offset, gen_rtx_AND (SImode, gen_lowpart (SImode, addr),
+				       GEN_INT (3)));
+
+  rtx tmp = gen_reg_rtx (SImode);
+  emit_move_insn (tmp, GEN_INT (1));
+
+  rtx shmt = gen_reg_rtx (SImode);
+  emit_move_insn (shmt, gen_rtx_ASHIFT (SImode, offset, GEN_INT (3)));
+
+  rtx word = gen_reg_rtx (SImode);
+  emit_move_insn (word, gen_rtx_ASHIFT (SImode, tmp, shmt));
+
+  tmp = gen_reg_rtx (SImode);
+  emit_insn (gen_atomic_fetch_orsi (tmp, aligned_mem, word, model));
+
+  emit_move_insn (gen_lowpart (SImode, result),
+		  gen_rtx_LSHIFTRT (SImode, tmp,
+				    gen_lowpart (SImode, shmt)));
+  DONE;
+})
diff -urN empty/gcc/config/riscv/t-elf gcc-5.3.0/gcc/config/riscv/t-elf
--- empty/gcc/config/riscv/t-elf	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/t-elf	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,4 @@
+# Build the libraries for both hard and soft floating point
+
+MULTILIB_OPTIONS = m64/m32 msoft-float mno-atomic
+MULTILIB_DIRNAMES = 64 32 soft-float no-atomic
diff -urN empty/gcc/config/riscv/t-linux64 gcc-5.3.0/gcc/config/riscv/t-linux64
--- empty/gcc/config/riscv/t-linux64	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/gcc/config/riscv/t-linux64	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,5 @@
+# Build the libraries for both hard and soft floating point
+
+MULTILIB_OPTIONS = m64/m32 msoft-float mno-atomic
+MULTILIB_DIRNAMES = 64 32 soft-float no-atomic
+MULTILIB_OSDIRNAMES = ../lib ../lib32 soft-float no-atomic
diff -urN empty/libgcc/config/riscv/crti.S gcc-5.3.0/libgcc/config/riscv/crti.S
--- empty/libgcc/config/riscv/crti.S	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/crti.S	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1 @@
+/* crti.S is empty because .init_array/.fini_array are used exclusively. */
diff -urN empty/libgcc/config/riscv/crtn.S gcc-5.3.0/libgcc/config/riscv/crtn.S
--- empty/libgcc/config/riscv/crtn.S	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/crtn.S	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1 @@
+/* crtn.S is empty because .init_array/.fini_array are used exclusively. */
diff -urN empty/libgcc/config/riscv/div.S gcc-5.3.0/libgcc/config/riscv/div.S
--- empty/libgcc/config/riscv/div.S	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/div.S	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,121 @@
+  .text
+  .align 2
+
+#ifndef __riscv64
+/* Our RV64 64-bit routines are equivalent to our RV32 32-bit routines.  */
+# define __udivdi3 __udivsi3
+# define __umoddi3 __umodsi3
+# define __divdi3 __divsi3
+# define __moddi3 __modsi3
+#else
+  .globl __udivsi3
+__udivsi3:
+  /* Compute __udivdi3(a0 << 32, a1 << 32); cast result to uint32_t.  */
+  sll    a0, a0, 32
+  sll    a1, a1, 32
+  move   t0, ra
+  jal    __udivdi3
+  sext.w a0, a0
+  jr     t0
+
+  .globl __umodsi3
+__umodsi3:
+  /* Compute __udivdi3((uint32_t)a0, (uint32_t)a1); cast a1 to uint32_t.  */
+  sll    a0, a0, 32
+  sll    a1, a1, 32
+  srl    a0, a0, 32
+  srl    a1, a1, 32
+  move   t0, ra
+  jal    __udivdi3
+  sext.w a0, a1
+  jr     t0
+
+  .globl __modsi3
+  __modsi3 = __moddi3
+
+  .globl __divsi3
+__divsi3:
+  /* Check for special case of INT_MIN/-1. Otherwise, fall into __divdi3.  */
+  li    t0, -1
+  beq   a1, t0, .L20
+#endif
+
+  .globl __divdi3
+__divdi3:
+  bltz  a0, .L10
+  bltz  a1, .L11
+  /* Since the quotient is positive, fall into __udivdi3.  */
+
+  .globl __udivdi3
+__udivdi3:
+  mv    a2, a1
+  mv    a1, a0
+  li    a0, -1
+  beqz  a2, .L5
+  li    a3, 1
+  bgeu  a2, a1, .L2
+.L1:
+  blez  a2, .L2
+  slli  a2, a2, 1
+  slli  a3, a3, 1
+  bgtu  a1, a2, .L1
+.L2:
+  li    a0, 0
+.L3:
+  bltu  a1, a2, .L4
+  sub   a1, a1, a2
+  or    a0, a0, a3
+.L4:
+  srli  a3, a3, 1
+  srli  a2, a2, 1
+  bnez  a3, .L3
+.L5:
+  ret
+
+  .globl __umoddi3
+__umoddi3:
+  /* Call __udivdi3(a0, a1), then return the remainder, which is in a1.  */
+  move  t0, ra
+  jal   __udivdi3
+  move  a0, a1
+  jr    t0
+
+  /* Handle negative arguments to __divdi3.  */
+.L10:
+  neg   a0, a0 
+  bgez  a1, .L12      /* Compute __udivdi3(-a0, a1), then negate the result.  */
+  neg   a1, a1
+  j     __divdi3      /* Compute __udivdi3(-a0, -a1).  */
+.L11:                 /* Compute __udivdi3(a0, -a1), then negate the result.  */
+  neg   a1, a1
+.L12:
+  move  t0, ra
+  jal   __divdi3
+  neg   a0, a0
+  jr    t0
+
+  .globl __moddi3
+__moddi3:
+  move   t0, ra
+  bltz   a1, .L31
+  bltz   a0, .L32
+.L30:
+  jal    __udivdi3    /* The dividend is not negative.  */
+  move   a0, a1
+  jr     t0
+.L31:
+  neg    a1, a1
+  bgez   a0, .L30
+.L32:
+  neg    a0, a0
+  jal    __udivdi3    /* The dividend is hella negative.  */
+  neg    a0, a1
+  jr     t0
+
+#ifdef __riscv64
+  /* continuation of __divsi3 */
+.L20:
+  sll   t0, t0, 31
+  bne   a0, t0, __divdi3
+  ret
+#endif
diff -urN empty/libgcc/config/riscv/muldi3.S gcc-5.3.0/libgcc/config/riscv/muldi3.S
--- empty/libgcc/config/riscv/muldi3.S	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/muldi3.S	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,21 @@
+  .text
+  .align 2
+
+#ifndef __riscv64
+/* Our RV64 64-bit routine is equivalent to our RV32 32-bit routine.  */
+# define __muldi3 __mulsi3
+#endif
+
+  .globl __muldi3
+__muldi3:
+  mv     a2, a0
+  li     a0, 0
+.L1:
+  andi   a3, a1, 1
+  beqz   a3, .L2
+  add    a0, a0, a2
+.L2:
+  srli   a1, a1, 1
+  slli   a2, a2, 1
+  bnez   a1, .L1
+  ret
diff -urN empty/libgcc/config/riscv/multi3.S gcc-5.3.0/libgcc/config/riscv/multi3.S
--- empty/libgcc/config/riscv/multi3.S	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/multi3.S	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,56 @@
+  .text
+  .align 2
+
+#ifndef __riscv64
+/* Our RV64 64-bit routines are equivalent to our RV32 32-bit routines.  */
+# define __multi3 __muldi3
+#endif
+
+  .globl __multi3
+__multi3:
+
+#ifndef __riscv64
+/* Our RV64 64-bit routines are equivalent to our RV32 32-bit routines.  */
+# define __muldi3 __mulsi3
+#endif
+
+/* We rely on the fact that __muldi3 doesn't clobber the t-registers.  */
+
+  mv  t0, ra
+  mv  t5, a0
+  mv  a0, a1
+  mv  t6, a3
+  mv  a1, t5
+  mv  a4, a2
+  li  a5, 0
+  li  t2, 0
+  li  t4, 0
+.L1:
+  add  a6, t2, a1
+  andi t3, a4, 1
+  slli a7, a5, 1
+  slti t1, a1, 0
+  srli a4, a4, 1
+  add  a5, t4, a5
+  beqz t3, .L2
+  sltu t3, a6, t2
+  mv   t2, a6
+  add  t4, t3, a5
+.L2:
+  slli a1, a1, 1
+  or   a5, t1, a7
+  bnez a4, .L1
+  beqz a0, .L3
+  mv   a1, a2
+  call __muldi3
+  add  t4, t4, a0
+.L3:
+  beqz t6, .L4
+  mv   a1, t6
+  mv   a0, t5
+  call  __muldi3
+  add  t4, t4, a0
+.L4:
+  mv  a0, t2
+  mv  a1, t4
+  jr  t0
diff -urN empty/libgcc/config/riscv/riscv-fp.c gcc-5.3.0/libgcc/config/riscv/riscv-fp.c
--- empty/libgcc/config/riscv/riscv-fp.c	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/riscv-fp.c	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,178 @@
+/* Functions needed for soft-float on riscv-linux.  Based on
+   rs6000/ppc64-fp.c with TF types removed.
+ 
+   Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+   2000, 2001, 2002, 2003, 2004, 2006, 2009  Free Software Foundation,
+   Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#if defined(__riscv64)
+#include "fp-bit.h"
+
+extern DItype __fixdfdi (DFtype);
+extern DItype __fixsfdi (SFtype);
+extern USItype __fixunsdfsi (DFtype);
+extern USItype __fixunssfsi (SFtype);
+extern DFtype __floatdidf (DItype);
+extern DFtype __floatundidf (UDItype);
+extern SFtype __floatdisf (DItype);
+extern SFtype __floatundisf (UDItype);
+
+static DItype local_fixunssfdi (SFtype);
+static DItype local_fixunsdfdi (DFtype);
+
+DItype
+__fixdfdi (DFtype a)
+{
+  if (a < 0)
+    return - local_fixunsdfdi (-a);
+  return local_fixunsdfdi (a);
+}
+
+DItype
+__fixsfdi (SFtype a)
+{
+  if (a < 0)
+    return - local_fixunssfdi (-a);
+  return local_fixunssfdi (a);
+}
+
+USItype
+__fixunsdfsi (DFtype a)
+{
+  if (a >= - (DFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
+    return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
+                       - (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
+  return (SItype) a;
+}
+
+USItype
+__fixunssfsi (SFtype a)
+{
+  if (a >= - (SFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
+    return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
+                       - (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
+  return (SItype) a;
+}
+
+DFtype
+__floatdidf (DItype u)
+{
+  DFtype d;
+
+  d = (SItype) (u >> (sizeof (SItype) * 8));
+  d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
+  d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
+
+  return d;
+}
+
+DFtype
+__floatundidf (UDItype u)
+{
+  DFtype d;
+
+  d = (USItype) (u >> (sizeof (SItype) * 8));
+  d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
+  d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
+
+  return d;
+}
+
+SFtype
+__floatdisf (DItype u)
+{
+  DFtype f;
+
+  if (53 < (sizeof (DItype) * 8)
+      && 53 > ((sizeof (DItype) * 8) - 53 + 24))
+    {
+      if (! (- ((DItype) 1 << 53) < u
+             && u < ((DItype) 1 << 53)))
+        {
+          if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
+            {
+              u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
+              u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
+            }
+        }
+    }
+  f = (SItype) (u >> (sizeof (SItype) * 8));
+  f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
+  f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
+
+  return (SFtype) f;
+}
+
+SFtype
+__floatundisf (UDItype u)
+{
+  DFtype f;
+
+  if (53 < (sizeof (DItype) * 8)
+      && 53 > ((sizeof (DItype) * 8) - 53 + 24))
+    {
+      if (u >= ((UDItype) 1 << 53))
+        {
+          if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
+            {
+              u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
+              u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
+            }
+        }
+    }
+  f = (USItype) (u >> (sizeof (SItype) * 8));
+  f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
+  f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
+
+  return (SFtype) f;
+}
+
+/* This version is needed to prevent recursion; fixunsdfdi in libgcc
+   calls fixdfdi, which in turn calls calls fixunsdfdi.  */
+
+static DItype
+local_fixunsdfdi (DFtype a)
+{
+  USItype hi, lo;
+
+  hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
+  lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
+  return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
+}
+
+/* This version is needed to prevent recursion; fixunssfdi in libgcc
+   calls fixsfdi, which in turn calls calls fixunssfdi.  */
+
+static DItype
+local_fixunssfdi (SFtype original_a)
+{
+  DFtype a = original_a;
+  USItype hi, lo;
+
+  hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
+  lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
+  return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
+}
+
+#endif
diff -urN empty/libgcc/config/riscv/save-restore.S gcc-5.3.0/libgcc/config/riscv/save-restore.S
--- empty/libgcc/config/riscv/save-restore.S	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/save-restore.S	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,220 @@
+  .text
+
+  .globl __riscv_save_12
+  .globl __riscv_save_11
+  .globl __riscv_save_10
+  .globl __riscv_save_9
+  .globl __riscv_save_8
+  .globl __riscv_save_7
+  .globl __riscv_save_6
+  .globl __riscv_save_5
+  .globl __riscv_save_4
+  .globl __riscv_save_3
+  .globl __riscv_save_2
+  .globl __riscv_save_1
+  .globl __riscv_save_0
+
+  .globl __riscv_restore_12
+  .globl __riscv_restore_11
+  .globl __riscv_restore_10
+  .globl __riscv_restore_9
+  .globl __riscv_restore_8
+  .globl __riscv_restore_7
+  .globl __riscv_restore_6
+  .globl __riscv_restore_5
+  .globl __riscv_restore_4
+  .globl __riscv_restore_3
+  .globl __riscv_restore_2
+  .globl __riscv_restore_1
+  .globl __riscv_restore_0
+
+#ifdef __riscv64
+
+__riscv_save_12:
+  addi sp, sp, -112
+  li t1, 0
+  sd s11, 8(sp)
+  j .Ls10
+
+__riscv_save_11:
+__riscv_save_10:
+  addi sp, sp, -112
+  li t1, -16
+.Ls10:
+  sd s10, 16(sp)
+  sd s9, 24(sp)
+  j .Ls8
+
+__riscv_save_9:
+__riscv_save_8:
+  addi sp, sp, -112
+  li t1, -32
+.Ls8:
+  sd s8, 32(sp)
+  sd s7, 40(sp)
+  j .Ls6
+
+__riscv_save_7:
+__riscv_save_6:
+  addi sp, sp, -112
+  li t1, -48
+.Ls6:
+  sd s6, 48(sp)
+  sd s5, 56(sp)
+  j .Ls4
+
+__riscv_save_5:
+__riscv_save_4:
+  addi sp, sp, -112
+  li t1, -64
+.Ls4:
+  sd s4, 64(sp)
+  sd s3, 72(sp)
+  j .Ls2
+
+__riscv_save_3:
+__riscv_save_2:
+  addi sp, sp, -112
+  li t1, -80
+.Ls2:
+  sd s2, 80(sp)
+  sd s1, 88(sp)
+  sd s0, 96(sp)
+  sd ra, 104(sp)
+  sub sp, sp, t1
+  jr t0
+
+__riscv_save_1:
+__riscv_save_0:
+  addi sp, sp, -16
+  sd s0, 0(sp)
+  sd ra, 8(sp)
+  jr t0
+
+__riscv_restore_12:
+  ld s11, 8(sp)
+  addi sp, sp, 16
+
+__riscv_restore_11:
+__riscv_restore_10:
+  ld s10, 0(sp)
+  ld s9, 8(sp)
+  addi sp, sp, 16
+
+__riscv_restore_9:
+__riscv_restore_8:
+  ld s8, 0(sp)
+  ld s7, 8(sp)
+  addi sp, sp, 16
+
+__riscv_restore_7:
+__riscv_restore_6:
+  ld s6, 0(sp)
+  ld s5, 8(sp)
+  addi sp, sp, 16
+
+__riscv_restore_5:
+__riscv_restore_4:
+  ld s4, 0(sp)
+  ld s3, 8(sp)
+  addi sp, sp, 16
+
+__riscv_restore_3:
+__riscv_restore_2:
+  ld s2, 0(sp)
+  ld s1, 8(sp)
+  addi sp, sp, 16
+
+__riscv_restore_1:
+__riscv_restore_0:
+  ld s0, 0(sp)
+  ld ra, 8(sp)
+  addi sp, sp, 16
+  ret
+
+#else
+
+__riscv_save_12:
+  addi sp, sp, -64
+  li t1, 0
+  sw s11, 12(sp)
+  j .Ls10
+
+__riscv_save_11:
+__riscv_save_10:
+__riscv_save_9:
+__riscv_save_8:
+  addi sp, sp, -64
+  li t1, -16
+.Ls10:
+  sw s10, 16(sp)
+  sw s9, 20(sp)
+  sw s8, 24(sp)
+  sw s7, 28(sp)
+  j .Ls6
+
+__riscv_save_7:
+__riscv_save_6:
+__riscv_save_5:
+__riscv_save_4:
+  addi sp, sp, -64
+  li t1, -32
+.Ls6:
+  sw s6, 32(sp)
+  sw s5, 36(sp)
+  sw s4, 40(sp)
+  sw s3, 44(sp)
+  sw s2, 48(sp)
+  sw s1, 52(sp)
+  sw s0, 56(sp)
+  sw ra, 60(sp)
+  sub sp, sp, t1
+  jr t0
+
+__riscv_save_3:
+__riscv_save_2:
+__riscv_save_1:
+__riscv_save_0:
+  addi sp, sp, -16
+  sw s2, 0(sp)
+  sw s1, 4(sp)
+  sw s0, 8(sp)
+  sw ra, 12(sp)
+  jr t0
+
+__riscv_restore_12:
+  lw s11, 12(sp)
+  addi sp, sp, 16
+
+__riscv_restore_11:
+__riscv_restore_10:
+__riscv_restore_9:
+__riscv_restore_8:
+  lw s10, 0(sp)
+  lw s9, 4(sp)
+  lw s8, 8(sp)
+  lw s7, 12(sp)
+  addi sp, sp, 16
+
+__riscv_restore_7:
+__riscv_restore_6:
+__riscv_restore_5:
+__riscv_restore_4:
+  lw s6, 0(sp)
+  lw s5, 4(sp)
+  lw s4, 8(sp)
+  lw s3, 12(sp)
+  addi sp, sp, 16
+
+__riscv_restore_3:
+__riscv_restore_2:
+__riscv_restore_1:
+__riscv_restore_0:
+  lw s2, 0(sp)
+  lw s1, 4(sp)
+  lw s0, 8(sp)
+  lw ra, 12(sp)
+  addi sp, sp, 16
+  ret
+
+#endif
diff -urN empty/libgcc/config/riscv/t-dpbit gcc-5.3.0/libgcc/config/riscv/t-dpbit
--- empty/libgcc/config/riscv/t-dpbit	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/t-dpbit	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,4 @@
+LIB2ADD += dp-bit.c
+
+dp-bit.c: $(srcdir)/fp-bit.c
+	cat $(srcdir)/fp-bit.c > dp-bit.c
diff -urN empty/libgcc/config/riscv/t-elf gcc-5.3.0/libgcc/config/riscv/t-elf
--- empty/libgcc/config/riscv/t-elf	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/t-elf	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,5 @@
+LIB2ADD += $(srcdir)/config/riscv/riscv-fp.c \
+	   $(srcdir)/config/riscv/save-restore.S \
+	   $(srcdir)/config/riscv/muldi3.S \
+	   $(srcdir)/config/riscv/multi3.S \
+	   $(srcdir)/config/riscv/div.S
diff -urN empty/libgcc/config/riscv/t-elf32 gcc-5.3.0/libgcc/config/riscv/t-elf32
--- empty/libgcc/config/riscv/t-elf32	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/t-elf32	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,4 @@
+LIB2FUNCS_EXCLUDE += _divsi3 _modsi3 _udivsi3 _umodsi3 _mulsi3 _muldi3
+
+HOST_LIBGCC2_CFLAGS += -m32
+CRTSTUFF_CFLAGS += -m32
diff -urN empty/libgcc/config/riscv/t-elf64 gcc-5.3.0/libgcc/config/riscv/t-elf64
--- empty/libgcc/config/riscv/t-elf64	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/t-elf64	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,2 @@
+LIB2FUNCS_EXCLUDE += _divdi3 _moddi3 _udivdi3 _umoddi3 _muldi3 _multi3 \
+		     _divsi3 _modsi3 _udivsi3 _umodsi3 \
diff -urN empty/libgcc/config/riscv/t-fpbit gcc-5.3.0/libgcc/config/riscv/t-fpbit
--- empty/libgcc/config/riscv/t-fpbit	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/t-fpbit	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,5 @@
+LIB2ADD += fp-bit.c
+
+fp-bit.c: $(srcdir)/fp-bit.c
+	echo '#define FLOAT' > fp-bit.c
+	cat $(srcdir)/fp-bit.c >> fp-bit.c
diff -urN empty/libgcc/config/riscv/t-tpbit gcc-5.3.0/libgcc/config/riscv/t-tpbit
--- empty/libgcc/config/riscv/t-tpbit	1970-01-01 08:00:00.000000000 +0800
+++ gcc-5.3.0/libgcc/config/riscv/t-tpbit	2016-04-02 14:07:12.472438058 +0800
@@ -0,0 +1,10 @@
+LIB2ADD += tp-bit.c
+
+tp-bit.c: $(srcdir)/fp-bit.c
+	echo '#ifdef _RISCVEL' > tp-bit.c
+	echo '# define FLOAT_BIT_ORDER_MISMATCH' >> tp-bit.c
+	echo '#endif' >> tp-bit.c
+	echo '#if __LDBL_MANT_DIG__ == 113' >> tp-bit.c
+	echo '# define TFLOAT' >> tp-bit.c
+	cat $(srcdir)/fp-bit.c >> tp-bit.c
+	echo '#endif' >> tp-bit.c