root / host-utils.c @ 3c4cf535
History | View | Annotate | Download (2.8 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 "exec.h" |
27 |
#include "host-utils.h" |
28 |
|
29 |
//#define DEBUG_MULDIV
|
30 |
|
31 |
/* Long integer helpers */
|
32 |
#if !defined(__x86_64__)
|
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 |
|
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 |
|
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 */
|
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 */
|
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__) */ |