1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*
* Copyright © 2013 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao_int64.h>
void ao_plus64(ao_int64_t *r, ao_int64_t *a, ao_int64_t *b) {
uint32_t t;
r->low = t = a->low + b->low;
r->high = a->high + b->high;
if (t < a->low)
r->high++;
}
void ao_rshift64(ao_int64_t *r, ao_int64_t *a, uint8_t d) {
if (d < 32) {
r->high = (int32_t) a->high >> d;
r->low = a->low >> d;
if (d)
r->low |= a->high << (32 - d);
} else {
d &= 0x1f;
r->high = 0;
r->low = (int32_t) a->high >> d;
}
}
void ao_lshift64(ao_int64_t *r, ao_int64_t *a, uint8_t d) {
if (d < 32) {
r->high = a->high << d;
r->low = a->low << d;
if (d)
r->high |= a->low >> (32 - d);
} else {
d &= 0x1f;
r->low = 0;
r->high = a->low << d;
}
}
void ao_umul64(ao_int64_t *r, uint32_t a, uint32_t b)
{
uint32_t r1;
uint32_t r2, r3, r4;
ao_int64_t s,t,u,v;
r1 = (uint32_t) (uint16_t) a * (uint16_t) b;
r2 = (uint32_t) (uint16_t) (a >> 16) * (uint16_t) b;
r3 = (uint32_t) (uint16_t) a * (uint16_t) (b >> 16);
r4 = (uint32_t) (uint16_t) (a >> 16) * (uint16_t) (b >> 16);
s.low = r1;
s.high = r4;
t.high = (uint32_t) r2 >> 16;
t.low = r2 << 16;
ao_plus64(&u, &s, &t);
v.high = (int32_t) r3 >> 16;
v.low = r3 << 16;
ao_plus64(r, &u, &v);
}
void ao_neg64(ao_int64_t *r, ao_int64_t *a) {
r->high = ~a->high;
r->low = ~a->low;
if (!++r->low)
r->high++;
}
void ao_mul64(ao_int64_t *r, int32_t a, int32_t b) {
uint8_t negative = 0;
if (a < 0) {
a = -a;
negative = 1;
}
if (b < 0) {
b = -b;
negative = !negative;
}
ao_umul64(r, a, b);
if (negative)
ao_neg64(r, r);
}
void ao_umul64_16(ao_int64_t *r, ao_int64_t *a, uint16_t b) {
uint32_t low = a->low;
ao_umul64(r, (uint32_t) low >> 1, (uint32_t) b << 1);
if (low & 1) {
if ((uint32_t) (r->low += b) < (uint32_t) b)
r->high++;
}
r->high += a->high * b;
}
void ao_mul64_16(ao_int64_t *r, ao_int64_t *a, uint16_t b) {
if ((int32_t) a->high < 0) {
ao_int64_t t;
ao_neg64(&t, a);
ao_umul64_16(r, &t, b);
ao_neg64(r, r);
} else
ao_umul64_16(r, a, b);
}
|
