1 /*
2 * Utility compute operations used by translated code.
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 * Copyright (c) 2007 Aurelien Jarno
6 *
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:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
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,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
24 */
25
26 #include "exec.h"
27 #include "host-utils.h"
28
29 //#define DEBUG_MULDIV
30
31 /* Long integer helpers */
32 #if !defined(__x86_64__)
add128(uint64_t * plow,uint64_t * phigh,uint64_t a,uint64_t b)33 static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
34 {
35 *plow += a;
36 /* carry test */
37 if (*plow < a)
38 (*phigh)++;
39 *phigh += b;
40 }
41
neg128(uint64_t * plow,uint64_t * phigh)42 static void neg128 (uint64_t *plow, uint64_t *phigh)
43 {
44 *plow = ~*plow;
45 *phigh = ~*phigh;
46 add128(plow, phigh, 1, 0);
47 }
48
mul64(uint64_t * plow,uint64_t * phigh,uint64_t a,uint64_t b)49 static void mul64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
50 {
51 uint32_t a0, a1, b0, b1;
52 uint64_t v;
53
54 a0 = a;
55 a1 = a >> 32;
56
57 b0 = b;
58 b1 = b >> 32;
59
60 v = (uint64_t)a0 * (uint64_t)b0;
61 *plow = v;
62 *phigh = 0;
63
64 v = (uint64_t)a0 * (uint64_t)b1;
65 add128(plow, phigh, v << 32, v >> 32);
66
67 v = (uint64_t)a1 * (uint64_t)b0;
68 add128(plow, phigh, v << 32, v >> 32);
69
70 v = (uint64_t)a1 * (uint64_t)b1;
71 *phigh += v;
72 }
73
74 /* Unsigned 64x64 -> 128 multiplication */
mulu64(uint64_t * plow,uint64_t * phigh,uint64_t a,uint64_t b)75 void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
76 {
77 mul64(plow, phigh, a, b);
78 #if defined(DEBUG_MULDIV)
79 printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
80 a, b, *phigh, *plow);
81 #endif
82 }
83
84 /* Signed 64x64 -> 128 multiplication */
muls64(uint64_t * plow,uint64_t * phigh,int64_t a,int64_t b)85 void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
86 {
87 int sa, sb;
88
89 sa = (a < 0);
90 if (sa)
91 a = -a;
92 sb = (b < 0);
93 if (sb)
94 b = -b;
95 mul64(plow, phigh, a, b);
96 if (sa ^ sb) {
97 neg128(plow, phigh);
98 }
99 #if defined(DEBUG_MULDIV)
100 printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
101 a, b, *phigh, *plow);
102 #endif
103 }
104 #endif /* !defined(__x86_64__) */
105