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source: vbox/trunk/src/recompiler/host-utils.c@ 75569

最後變更 在這個檔案從75569是 69465,由 vboxsync 提交於 7 年 前

recompiler: scm updates

  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Id Revision
檔案大小: 2.9 KB
 
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 <stdlib.h>
27#ifndef VBOX
28#include <stdint.h>
29#else
30# include <iprt/types.h>
31#endif
32#include "host-utils.h"
33
34//#define DEBUG_MULDIV
35
36/* Long integer helpers */
37#if !defined(__x86_64__)
38static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
39{
40 *plow += a;
41 /* carry test */
42 if (*plow < a)
43 (*phigh)++;
44 *phigh += b;
45}
46
47static void neg128 (uint64_t *plow, uint64_t *phigh)
48{
49 *plow = ~*plow;
50 *phigh = ~*phigh;
51 add128(plow, phigh, 1, 0);
52}
53
54static void mul64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
55{
56 uint32_t a0, a1, b0, b1;
57 uint64_t v;
58
59 a0 = a;
60 a1 = a >> 32;
61
62 b0 = b;
63 b1 = b >> 32;
64
65 v = (uint64_t)a0 * (uint64_t)b0;
66 *plow = v;
67 *phigh = 0;
68
69 v = (uint64_t)a0 * (uint64_t)b1;
70 add128(plow, phigh, v << 32, v >> 32);
71
72 v = (uint64_t)a1 * (uint64_t)b0;
73 add128(plow, phigh, v << 32, v >> 32);
74
75 v = (uint64_t)a1 * (uint64_t)b1;
76 *phigh += v;
77}
78
79/* Unsigned 64x64 -> 128 multiplication */
80void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
81{
82 mul64(plow, phigh, a, b);
83#if defined(DEBUG_MULDIV)
84 printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
85 a, b, *phigh, *plow);
86#endif
87}
88
89/* Signed 64x64 -> 128 multiplication */
90void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
91{
92 int sa, sb;
93
94 sa = (a < 0);
95 if (sa)
96 a = -a;
97 sb = (b < 0);
98 if (sb)
99 b = -b;
100 mul64(plow, phigh, a, b);
101 if (sa ^ sb) {
102 neg128(plow, phigh);
103 }
104#if defined(DEBUG_MULDIV)
105 printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
106 a, b, *phigh, *plow);
107#endif
108}
109#endif /* !defined(__x86_64__) */
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