76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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/*
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* Utility compute operations used by translated code.
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*
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* Copyright (c) 2007 Aurelien Jarno
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h"
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/* Signed 64x64 -> 128 multiplication */
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void muls64(int64_t *phigh, int64_t *plow, int64_t a, int64_t b)
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{
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#if defined(__x86_64__)
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__asm__ ("imul %0\n\t"
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: "=d" (*phigh), "=a" (*plow)
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: "a" (a), "0" (b)
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);
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#else
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int64_t ph;
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uint64_t pm1, pm2, pl;
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pl = (uint64_t)((uint32_t)a) * (uint64_t)((uint32_t)b);
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pm1 = (a >> 32) * (uint32_t)b;
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pm2 = (uint32_t)a * (b >> 32);
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ph = (a >> 32) * (b >> 32);
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ph += (int64_t)pm1 >> 32;
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pm1 = (uint64_t)((uint32_t)pm1) + pm2 + (pl >> 32);
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*phigh = ph + ((int64_t)pm1 >> 32);
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*plow = (pm1 << 32) + (uint32_t)pl;
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#endif
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}
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/* Unsigned 64x64 -> 128 multiplication */
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void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b)
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{
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#if defined(__x86_64__)
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__asm__ ("mul %0\n\t"
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: "=d" (*phigh), "=a" (*plow)
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: "a" (a), "0" (b)
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);
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#else
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uint64_t ph, pm1, pm2, pl;
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pl = (uint64_t)((uint32_t)a) * (uint64_t)((uint32_t)b);
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pm1 = (a >> 32) * (uint32_t)b;
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pm2 = (uint32_t)a * (b >> 32);
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ph = (a >> 32) * (b >> 32);
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ph += pm1 >> 32;
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pm1 = (uint64_t)((uint32_t)pm1) + pm2 + (pl >> 32);
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*phigh = ph + (pm1 >> 32);
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*plow = (pm1 << 32) + (uint32_t)pl;
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#endif
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}
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