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1 | 69d35728 | ths | /*
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2 | 69d35728 | ths | * Utility compute operations used by translated code.
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3 | 69d35728 | ths | *
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4 | e494ead5 | ths | * Copyright (c) 2003 Fabrice Bellard
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5 | 69d35728 | ths | * Copyright (c) 2007 Aurelien Jarno
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6 | 69d35728 | ths | *
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7 | 69d35728 | ths | * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 | 69d35728 | ths | * of this software and associated documentation files (the "Software"), to deal
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9 | 69d35728 | ths | * in the Software without restriction, including without limitation the rights
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10 | 69d35728 | ths | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 | 69d35728 | ths | * copies of the Software, and to permit persons to whom the Software is
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12 | 69d35728 | ths | * furnished to do so, subject to the following conditions:
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13 | 69d35728 | ths | *
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14 | 69d35728 | ths | * The above copyright notice and this permission notice shall be included in
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15 | 69d35728 | ths | * all copies or substantial portions of the Software.
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16 | 69d35728 | ths | *
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17 | 69d35728 | ths | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 | 69d35728 | ths | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | 69d35728 | ths | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | 69d35728 | ths | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 | 69d35728 | ths | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 | 69d35728 | ths | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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23 | 69d35728 | ths | * THE SOFTWARE.
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24 | 69d35728 | ths | */
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25 | 69d35728 | ths | |
26 | facd2857 | Blue Swirl | #include <stdlib.h> |
27 | facd2857 | Blue Swirl | #include <stdint.h> |
28 | 084ed5cc | j_mayer | #include "host-utils.h" |
29 | 69d35728 | ths | |
30 | 5592a750 | ths | //#define DEBUG_MULDIV
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31 | 5592a750 | ths | |
32 | e494ead5 | ths | /* Long integer helpers */
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33 | 7a51ad82 | j_mayer | #if !defined(__x86_64__)
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34 | e494ead5 | ths | static void add128 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) |
35 | e494ead5 | ths | { |
36 | e494ead5 | ths | *plow += a; |
37 | e494ead5 | ths | /* carry test */
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38 | e494ead5 | ths | if (*plow < a)
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39 | e494ead5 | ths | (*phigh)++; |
40 | e494ead5 | ths | *phigh += b; |
41 | e494ead5 | ths | } |
42 | 69d35728 | ths | |
43 | e494ead5 | ths | static void neg128 (uint64_t *plow, uint64_t *phigh) |
44 | 69d35728 | ths | { |
45 | e494ead5 | ths | *plow = ~*plow; |
46 | e494ead5 | ths | *phigh = ~*phigh; |
47 | e494ead5 | ths | add128(plow, phigh, 1, 0); |
48 | e494ead5 | ths | } |
49 | 69d35728 | ths | |
50 | e494ead5 | ths | static void mul64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b) |
51 | e494ead5 | ths | { |
52 | e494ead5 | ths | uint32_t a0, a1, b0, b1; |
53 | e494ead5 | ths | uint64_t v; |
54 | 69d35728 | ths | |
55 | e494ead5 | ths | a0 = a; |
56 | e494ead5 | ths | a1 = a >> 32;
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57 | 69d35728 | ths | |
58 | e494ead5 | ths | b0 = b; |
59 | e494ead5 | ths | b1 = b >> 32;
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60 | e494ead5 | ths | |
61 | e494ead5 | ths | v = (uint64_t)a0 * (uint64_t)b0; |
62 | e494ead5 | ths | *plow = v; |
63 | e494ead5 | ths | *phigh = 0;
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64 | e494ead5 | ths | |
65 | e494ead5 | ths | v = (uint64_t)a0 * (uint64_t)b1; |
66 | e494ead5 | ths | add128(plow, phigh, v << 32, v >> 32); |
67 | e494ead5 | ths | |
68 | e494ead5 | ths | v = (uint64_t)a1 * (uint64_t)b0; |
69 | e494ead5 | ths | add128(plow, phigh, v << 32, v >> 32); |
70 | e494ead5 | ths | |
71 | e494ead5 | ths | v = (uint64_t)a1 * (uint64_t)b1; |
72 | e494ead5 | ths | *phigh += v; |
73 | 69d35728 | ths | } |
74 | 69d35728 | ths | |
75 | 69d35728 | ths | /* Unsigned 64x64 -> 128 multiplication */
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76 | e494ead5 | ths | void mulu64 (uint64_t *plow, uint64_t *phigh, uint64_t a, uint64_t b)
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77 | 69d35728 | ths | { |
78 | e494ead5 | ths | mul64(plow, phigh, a, b); |
79 | e494ead5 | ths | #if defined(DEBUG_MULDIV)
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80 | e494ead5 | ths | printf("mulu64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
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81 | e494ead5 | ths | a, b, *phigh, *plow); |
82 | e494ead5 | ths | #endif
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83 | e494ead5 | ths | } |
84 | 69d35728 | ths | |
85 | e494ead5 | ths | /* Signed 64x64 -> 128 multiplication */
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86 | e494ead5 | ths | void muls64 (uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
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87 | e494ead5 | ths | { |
88 | e494ead5 | ths | int sa, sb;
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89 | 69d35728 | ths | |
90 | e494ead5 | ths | sa = (a < 0);
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91 | e494ead5 | ths | if (sa)
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92 | e494ead5 | ths | a = -a; |
93 | e494ead5 | ths | sb = (b < 0);
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94 | e494ead5 | ths | if (sb)
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95 | e494ead5 | ths | b = -b; |
96 | e494ead5 | ths | mul64(plow, phigh, a, b); |
97 | e494ead5 | ths | if (sa ^ sb) {
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98 | e494ead5 | ths | neg128(plow, phigh); |
99 | e494ead5 | ths | } |
100 | e494ead5 | ths | #if defined(DEBUG_MULDIV)
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101 | e494ead5 | ths | printf("muls64: 0x%016llx * 0x%016llx = 0x%016llx%016llx\n",
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102 | e494ead5 | ths | a, b, *phigh, *plow); |
103 | 69d35728 | ths | #endif
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104 | 69d35728 | ths | } |
105 | 7a51ad82 | j_mayer | #endif /* !defined(__x86_64__) */ |