mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
69d357286d
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2821 c046a42c-6fe2-441c-8c8c-71466251a162
75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/*
|
|
* Utility compute operations used by translated code.
|
|
*
|
|
* Copyright (c) 2007 Aurelien Jarno
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "vl.h"
|
|
|
|
/* Signed 64x64 -> 128 multiplication */
|
|
|
|
void muls64(int64_t *phigh, int64_t *plow, int64_t a, int64_t b)
|
|
{
|
|
#if defined(__x86_64__)
|
|
__asm__ ("imul %0\n\t"
|
|
: "=d" (*phigh), "=a" (*plow)
|
|
: "a" (a), "0" (b)
|
|
);
|
|
#else
|
|
int64_t ph;
|
|
uint64_t pm1, pm2, pl;
|
|
|
|
pl = (uint64_t)((uint32_t)a) * (uint64_t)((uint32_t)b);
|
|
pm1 = (a >> 32) * (uint32_t)b;
|
|
pm2 = (uint32_t)a * (b >> 32);
|
|
ph = (a >> 32) * (b >> 32);
|
|
|
|
ph += (int64_t)pm1 >> 32;
|
|
pm1 = (uint64_t)((uint32_t)pm1) + pm2 + (pl >> 32);
|
|
|
|
*phigh = ph + ((int64_t)pm1 >> 32);
|
|
*plow = (pm1 << 32) + (uint32_t)pl;
|
|
#endif
|
|
}
|
|
|
|
/* Unsigned 64x64 -> 128 multiplication */
|
|
void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b)
|
|
{
|
|
#if defined(__x86_64__)
|
|
__asm__ ("mul %0\n\t"
|
|
: "=d" (*phigh), "=a" (*plow)
|
|
: "a" (a), "0" (b)
|
|
);
|
|
#else
|
|
uint64_t ph, pm1, pm2, pl;
|
|
|
|
pl = (uint64_t)((uint32_t)a) * (uint64_t)((uint32_t)b);
|
|
pm1 = (a >> 32) * (uint32_t)b;
|
|
pm2 = (uint32_t)a * (b >> 32);
|
|
ph = (a >> 32) * (b >> 32);
|
|
|
|
ph += pm1 >> 32;
|
|
pm1 = (uint64_t)((uint32_t)pm1) + pm2 + (pl >> 32);
|
|
|
|
*phigh = ph + (pm1 >> 32);
|
|
*plow = (pm1 << 32) + (uint32_t)pl;
|
|
#endif
|
|
}
|