blob: b0176adcccf714274117ef25a2b86427e0f7a90b (
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
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
|
///////////////////////////////////////////////////////////////////////////////
//
/// \file crc_common.h
/// \brief Some functions and macros for CRC32 and CRC64
//
// Authors: Lasse Collin
// Ilya Kurdyukov
// Hans Jansen
// Jia Tan
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#ifdef WORDS_BIGENDIAN
# define A(x) ((x) >> 24)
# define B(x) (((x) >> 16) & 0xFF)
# define C(x) (((x) >> 8) & 0xFF)
# define D(x) ((x) & 0xFF)
# define S8(x) ((x) << 8)
# define S32(x) ((x) << 32)
#else
# define A(x) ((x) & 0xFF)
# define B(x) (((x) >> 8) & 0xFF)
# define C(x) (((x) >> 16) & 0xFF)
# define D(x) ((x) >> 24)
# define S8(x) ((x) >> 8)
# define S32(x) ((x) >> 32)
#endif
#undef CRC_GENERIC
#undef CRC_CLMUL
#undef CRC_USE_IFUNC
#undef CRC_USE_GENERIC_FOR_SMALL_INPUTS
// If CLMUL cannot be used then only the generic slice-by-four is built.
#if !defined(HAVE_USABLE_CLMUL)
# define CRC_GENERIC 1
// If CLMUL is allowed unconditionally in the compiler options then the
// generic version can be omitted. Note that this doesn't work with MSVC
// as I don't know how to detect the features here.
//
// NOTE: Keep this this in sync with crc32_table.c.
#elif (defined(__SSSE3__) && defined(__SSE4_1__) && defined(__PCLMUL__)) \
|| (defined(__e2k__) && __iset__ >= 6)
# define CRC_CLMUL 1
// Otherwise build both and detect at runtime which version to use.
#else
# define CRC_GENERIC 1
# define CRC_CLMUL 1
# ifdef HAVE_FUNC_ATTRIBUTE_IFUNC
# define CRC_USE_IFUNC 1
# endif
/*
// The generic code is much faster with 1-8-byte inputs and has
// similar performance up to 16 bytes at least in microbenchmarks
// (it depends on input buffer alignment too). If both versions are
// built, this #define will use the generic version for inputs up to
// 16 bytes and CLMUL for bigger inputs. It saves a little in code
// size since the special cases for 0-16-byte inputs will be omitted
// from the CLMUL code.
# define CRC_USE_GENERIC_FOR_SMALL_INPUTS 1
*/
# if defined(_MSC_VER)
# include <intrin.h>
# elif defined(HAVE_CPUID_H)
# include <cpuid.h>
# endif
#endif
/// Detect at runtime if the CPU supports the x86 CLMUL instruction when
/// both the generic and CLMUL implementations are built.
extern bool lzma_is_clmul_supported(void);
/// CRC32 implemented with the x86 CLMUL instruction.
extern uint32_t lzma_crc32_clmul(const uint8_t *buf, size_t size,
uint32_t crc);
/// CRC64 implemented with the x86 CLMUL instruction.
extern uint64_t lzma_crc64_clmul(const uint8_t *buf, size_t size,
uint64_t crc);
|
