From d8cd2e9c37377eae5cf42e1778aeb7682d2256ac Mon Sep 17 00:00:00 2001 From: Patrick Georgi Date: Thu, 4 Apr 2019 18:07:52 +0200 Subject: [PATCH] libpayload: make log2 and clz work on signed values internally Needed to make libpayload build clean with -Wconversion. BUG=b:111443775 BRANCH=none TEST=make junit.xml shows fewer warnings with -Wconversion enabled Change-Id: Ie193e39854d2231b6d09a2b0deeeef2873e900ab Signed-off-by: Patrick Georgi Reviewed-on: https://review.coreboot.org/c/coreboot/+/32184 Tested-by: build bot (Jenkins) Reviewed-by: Jacob Garber Reviewed-by: Stefan Reinauer --- payloads/libpayload/include/libpayload.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h index a578d41f28..57a3afc6b1 100644 --- a/payloads/libpayload/include/libpayload.h +++ b/payloads/libpayload/include/libpayload.h @@ -434,9 +434,12 @@ void hexdump(const void *memory, size_t length); void fatal(const char *msg) __attribute__((noreturn)); /* Count Leading Zeroes: clz(0) == 32, clz(0xf) == 28, clz(1 << 31) == 0 */ -static inline int clz(u32 x) { return x ? __builtin_clz(x) : sizeof(x) * 8; } +static inline int clz(u32 x) +{ + return x ? __builtin_clz(x) : (int)sizeof(x) * 8; +} /* Integer binary logarithm (rounding down): log2(0) == -1, log2(5) == 2 */ -static inline int log2(u32 x) { return sizeof(x) * 8 - clz(x) - 1; } +static inline int log2(u32 x) { return (int)sizeof(x) * 8 - clz(x) - 1; } /* Find First Set: __ffs(0xf) == 0, __ffs(0) == -1, __ffs(1 << 31) == 31 */ static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); } /** @} */