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
|
/* See LICENSE file for copyright and license details. */
#include "internals.h"
O2 static inline void
zxor_impl_3(register zahl_char_t *restrict a,
register const zahl_char_t *restrict b, size_t n)
{
size_t i;
for (i = 0; i < n; i++)
a[i] ^= b[i];
}
static inline void
zxor_impl_5(register zahl_char_t *restrict a,
register const zahl_char_t *restrict b, size_t n,
register const zahl_char_t *restrict c, size_t m)
{
size_t i;
for (i = 0; i < n; i++)
a[i] = b[i] ^ c[i];
for (; i < m; i++)
a[i] = c[i];
}
void
zxor(z_t a, z_t b, z_t c)
{
size_t n, m, bn, cn;
const zahl_char_t *restrict bc;
const zahl_char_t *restrict cc;
if (unlikely(zzero(b))) {
SET(a, c);
return;
} else if (unlikely(zzero(c))) {
SET(a, b);
return;
}
bn = b->used;
bc = b->chars;
cn = c->used;
cc = c->chars;
MIN_MAX_1(n, m, bn, cn);
ENSURE_SIZE(a, m);
if (a == b) {
zxor_impl_3(a->chars, cc, n);
if (a->used < cn)
zmemcpy_range(a->chars, cc, n, m);
} else if (unlikely(a == c)) {
zxor_impl_3(a->chars, bc, n);
if (a->used < bn)
zmemcpy_range(a->chars, bc, n, m);
} else if (m == bn) {
zxor_impl_5(a->chars, cc, n, bc, m);
} else {
zxor_impl_5(a->chars, bc, n, cc, m);
}
a->used = m;
TRIM_AND_SIGN(a, 1 - 2 * ((zsignum(b) ^ zsignum(c)) < 0));
}
|
