56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Based on linux arch/mips/lib/ashldi3.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __ORDER_LITTLE_ENDIAN__
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#errror "What endian are you!?"
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#endif
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typedef unsigned word_type;
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long long __ashldi3(long long u, word_type b);
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struct DWstruct {
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int low, high;
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};
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typedef union {
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struct DWstruct s;
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long long ll;
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} DWunion;
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long long __ashldi3(long long u, word_type b)
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{
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DWunion uu, w;
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word_type bm;
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if (b == 0)
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return u;
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uu.ll = u;
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bm = 32 - b;
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if (bm <= 0) {
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w.s.low = 0;
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w.s.high = (unsigned int) uu.s.low << -bm;
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} else {
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const unsigned int carries = (unsigned int) uu.s.low >> bm;
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w.s.low = (unsigned int) uu.s.low << b;
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w.s.high = ((unsigned int) uu.s.high << b) | carries;
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}
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return w.ll;
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}
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