2 * Utility compute operations used by translated code.
4 * Copyright (c) 2003 Fabrice Bellard
5 * Copyright (c) 2007 Aurelien Jarno
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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28 /* Long integer helpers */
29 static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
38 static void neg128 (uint64_t *plow, uint64_t *phigh)
42 add128(plow, phigh, 1, 0);
45 static void mul64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
47 uint32_t a0, a1, b0, b1;
56 v = (uint64_t)a0 * (uint64_t)b0;
60 v = (uint64_t)a0 * (uint64_t)b1;
61 add128(plow, phigh, v << 32, v >> 32);
63 v = (uint64_t)a1 * (uint64_t)b0;
64 add128(plow, phigh, v << 32, v >> 32);
66 v = (uint64_t)a1 * (uint64_t)b1;
71 /* Unsigned 64x64 -> 128 multiplication */
72 void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
74 #if defined(__x86_64__)
76 : "=d" (*phigh), "=a" (*plow)
79 mul64(plow, phigh, a, b);
81 #if defined(DEBUG_MULDIV)
82 printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
87 /* Signed 64x64 -> 128 multiplication */
88 void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
90 #if defined(__x86_64__)
91 __asm__ ("imul %0\n\t"
92 : "=d" (*phigh), "=a" (*plow)
103 mul64(plow, phigh, a, b);
108 #if defined(DEBUG_MULDIV)
109 printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
110 a, b, *phigh, *plow);