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
|
/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
/* No instrics defined for 32-bit MSVC */
#if (defined(_M_ARM64) || defined(__aarch64__) || defined(__arm__))
# include <aws/checksums/private/crc32_priv.h>
# ifdef _M_ARM64
# include <arm64_neon.h>
# define PREFETCH(p) __prefetch(p)
# else
# include <arm_acle.h>
# define PREFETCH(p) __builtin_prefetch(p)
# endif
uint32_t aws_checksums_crc32c_armv8(const uint8_t *data, int length, uint32_t previous_crc32c) {
uint32_t crc = ~previous_crc32c;
// Align data if it's not aligned
while (((uintptr_t)data & 7) && length > 0) {
crc = __crc32cb(crc, *(uint8_t *)data);
data++;
length--;
}
while (length >= 64) {
PREFETCH(data + 384);
uint64_t *d = (uint64_t *)data;
crc = __crc32cd(crc, d[0]);
crc = __crc32cd(crc, d[1]);
crc = __crc32cd(crc, d[2]);
crc = __crc32cd(crc, d[3]);
crc = __crc32cd(crc, d[4]);
crc = __crc32cd(crc, d[5]);
crc = __crc32cd(crc, d[6]);
crc = __crc32cd(crc, d[7]);
data += 64;
length -= 64;
}
while (length >= 8) {
crc = __crc32cd(crc, *(uint64_t *)data);
data += 8;
length -= 8;
}
while (length > 0) {
crc = __crc32cb(crc, *(uint8_t *)data);
data++;
length--;
}
return ~crc;
}
uint32_t aws_checksums_crc32_armv8(const uint8_t *data, int length, uint32_t previous_crc32) {
uint32_t crc = ~previous_crc32;
// Align data if it's not aligned
while (((uintptr_t)data & 7) && length > 0) {
crc = __crc32b(crc, *(uint8_t *)data);
data++;
length--;
}
while (length >= 64) {
PREFETCH(data + 384);
uint64_t *d = (uint64_t *)data;
crc = __crc32d(crc, d[0]);
crc = __crc32d(crc, d[1]);
crc = __crc32d(crc, d[2]);
crc = __crc32d(crc, d[3]);
crc = __crc32d(crc, d[4]);
crc = __crc32d(crc, d[5]);
crc = __crc32d(crc, d[6]);
crc = __crc32d(crc, d[7]);
data += 64;
length -= 64;
}
while (length >= 8) {
crc = __crc32d(crc, *(uint64_t *)data);
data += 8;
length -= 8;
}
while (length > 0) {
crc = __crc32b(crc, *(uint8_t *)data);
data++;
length--;
}
return ~crc;
}
#endif
|
