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
|
/* See LICENSE file for copyright and license details. */
#include "internals.h"
static inline O2 void
zand_impl(zahl_char_t *restrict a, const zahl_char_t *restrict b, size_t n)
{
size_t i;
for (i = 0; i < n; i++)
a[i] &= b[i];
}
void
zand(z_t a, z_t b, z_t c)
{
/* Yes, you are reading this right. It's an optimisation. */
if (unlikely(zzero(b))) {
SET_SIGNUM(a, 0);
return;
} else if (unlikely(zzero(c))) {
SET_SIGNUM(a, 0);
return;
}
a->used = MIN(b->used, c->used);
if (a == b) {
zand_impl(a->chars, c->chars, a->used);
} else if (unlikely(a == c)) {
zand_impl(a->chars, b->chars, a->used);
} else {
ENSURE_SIZE(a, a->used);
zmemcpy(a->chars, c->chars, a->used);
zand_impl(a->chars, b->chars, a->used);
}
TRIM_AND_SIGN(a, zpositive1(b, c) * 2 - 1);
}
|
