blob: 94c8c24249298bcf8058064932f73a8927871ab8 (
plain) (
blame)
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
|
//===-- scudo_crc32.cpp -----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// CRC32 function leveraging hardware specific instructions. This has to be
/// kept separated to restrict the use of compiler specific flags to this file.
///
//===----------------------------------------------------------------------===//
// Hardware CRC32 is supported at compilation via the following:
// - for i386 & x86_64: -msse4.2
// - for ARM & AArch64: -march=armv8-a+crc or -mcrc
// An additional check must be performed at runtime as well to make sure the
// emitted instructions are valid on the target host.
#include "scudo_crc32.h"
#include "scudo_utils.h"
#if defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
# ifdef __SSE4_2__
# include <smmintrin.h>
# define CRC32_INTRINSIC FIRST_32_SECOND_64(_mm_crc32_u32, _mm_crc32_u64)
# endif
# ifdef __ARM_FEATURE_CRC32
# include <arm_acle.h>
# define CRC32_INTRINSIC FIRST_32_SECOND_64(__crc32cw, __crc32cd)
# endif
#endif // defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
namespace __scudo {
#if defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
INLINE u32 computeHardwareCRC32(u32 Crc, uptr Data) {
return CRC32_INTRINSIC(Crc, Data);
}
u32 computeCRC32(u32 Crc, uptr Data, u8 HashType) {
if (HashType == CRC32Hardware) {
return computeHardwareCRC32(Crc, Data);
}
return computeSoftwareCRC32(Crc, Data);
}
#else
u32 computeCRC32(u32 Crc, uptr Data, u8 HashType) {
return computeSoftwareCRC32(Crc, Data);
}
#endif // defined(__SSE4_2__) || defined(__ARM_FEATURE_CRC32)
} // namespace __scudo
|
