host-utils.c

   1 /*
   2  * Utility compute operations used by translated code.
   3  *
   4  * Copyright (c) 2007 Aurelien Jarno
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "vl.h"
  26
  27 /* Signed 64x64 -> 128 multiplication */
  28
  29 void muls64(int64_t *phigh, int64_t *plow, int64_t a, int64_t b)
  30 {
  31 #if defined(__x86_64__)
  32     __asm__ ("imul %0\n\t"
  33              : "=d" (*phigh), "=a" (*plow)
  34              : "a" (a), "0" (b)
  35              );
  36 #else
  37     int64_t ph;
  38     uint64_t pm1, pm2, pl;
  39
  40     pl = (uint64_t)((uint32_t)a) * (uint64_t)((uint32_t)b);
  41     pm1 = (a >> 32) * (uint32_t)b;
  42     pm2 = (uint32_t)a * (b >> 32);
  43     ph = (a >> 32) * (b >> 32);
  44
  45     ph += (int64_t)pm1 >> 32;
  46     pm1 = (uint64_t)((uint32_t)pm1) + pm2 + (pl >> 32);
  47
  48     *phigh = ph + ((int64_t)pm1 >> 32);
  49     *plow = (pm1 << 32) + (uint32_t)pl;
  50 #endif
  51 }
  52
  53 /* Unsigned 64x64 -> 128 multiplication */
  54 void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b)
  55 {
  56 #if defined(__x86_64__)
  57     __asm__ ("mul %0\n\t"
  58              : "=d" (*phigh), "=a" (*plow)
  59              : "a" (a), "0" (b)
  60             );
  61 #else
  62     uint64_t ph, pm1, pm2, pl;
  63
  64     pl = (uint64_t)((uint32_t)a) * (uint64_t)((uint32_t)b);
  65     pm1 = (a >> 32) * (uint32_t)b;
  66     pm2 = (uint32_t)a * (b >> 32);
  67     ph = (a >> 32) * (b >> 32);
  68
  69     ph += pm1 >> 32;
  70     pm1 = (uint64_t)((uint32_t)pm1) + pm2 + (pl >> 32);
  71
  72     *phigh = ph + (pm1 >> 32);
  73     *plow = (pm1 << 32) + (uint32_t)pl;
  74 #endif
  75 }