Crypto++ 8.6 Free C++ class library of cryptographic schemes

crc_simd.cpp
1 // crc_simd.cpp - written and placed in the public domain by
2 // Jeffrey Walton, Uri Blumenthal and Marcel Raad.
3 //
4 // This source file uses intrinsics to gain access to SSE4.2 and
5 // ARMv8a CRC-32 and CRC-32C instructions. A separate source file
6 // is needed because additional CXXFLAGS are required to enable
7 // the appropriate instructions sets in some build configurations.
8
9 #include "pch.h"
10 #include "config.h"
11 #include "misc.h"
12
13 #if (CRYPTOPP_SSE42_AVAILABLE)
14 # include <nmmintrin.h>
15 #endif
16
17 #if (CRYPTOPP_ARM_ACLE_HEADER)
18 # include <stdint.h>
19 # include <arm_acle.h>
20 #endif
21
22 #if (CRYPTOPP_ARM_CRC32_AVAILABLE)
23 # include "arm_simd.h"
24 #endif
25
26 #ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
27 # include <signal.h>
28 # include <setjmp.h>
29 #endif
30
31 #ifndef EXCEPTION_EXECUTE_HANDLER
32 # define EXCEPTION_EXECUTE_HANDLER 1
33 #endif
34
35 #define CONST_WORD32_CAST(x) ((const word32 *)(void*)(x))
36
37 // Squash MS LNK4221 and libtool warnings
38 extern const char CRC_SIMD_FNAME[] = __FILE__;
39
40 NAMESPACE_BEGIN(CryptoPP)
41
42 #ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
43 extern "C" {
44 typedef void (*SigHandler)(int);
45
46 static jmp_buf s_jmpSIGILL;
47 static void SigIllHandler(int)
48 {
49 longjmp(s_jmpSIGILL, 1);
50 }
51 }
52 #endif // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
53
54 #if (CRYPTOPP_BOOL_ARM32 || CRYPTOPP_BOOL_ARMV8)
55
56 bool CPU_ProbeCRC32()
57 {
58 #if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
59 return false;
60 #elif (CRYPTOPP_ARM_CRC32_AVAILABLE)
61 # if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY)
62 volatile bool result = true;
63 __try
64 {
65 word32 w=0, x=1; byte z=3;
66 w = CRC32W(w,x);
67 w = CRC32B(w,z);
68 w = CRC32CW(w,x);
69 w = CRC32CB(w,z);
70
71 result = !!w;
72 }
73 __except (EXCEPTION_EXECUTE_HANDLER)
74 {
75 return false;
76 }
77 return result;
78 #else
79
80 // longjmp and clobber warnings. Volatile is required.
81 // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
82 volatile bool result = true;
83
84 volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
85 if (oldHandler == SIG_ERR)
86 return false;
87
88 volatile sigset_t oldMask;
89 if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
90 {
91 signal(SIGILL, oldHandler);
92 return false;
93 }
94
95 if (setjmp(s_jmpSIGILL))
96 result = false;
97 else
98 {
99 word32 w=0, x=1; byte z=3;
100 w = CRC32W(w,x);
101 w = CRC32B(w,z);
102 w = CRC32CW(w,x);
103 w = CRC32CB(w,z);
104
105 // Hack... GCC optimizes away the code and returns true
106 result = !!w;
107 }
108
109 sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
110 signal(SIGILL, oldHandler);
111 return result;
112 # endif
113 #else
114 return false;
115 #endif // CRYPTOPP_ARM_CRC32_AVAILABLE
116 }
117 #endif // ARM32 or ARM64
118
119 #if (CRYPTOPP_ARM_CRC32_AVAILABLE)
120 void CRC32_Update_ARMV8(const byte *s, size_t n, word32& c)
121 {
122 for(; !IsAligned<word32>(s) && n > 0; s++, n--)
123 c = CRC32B(c, *s);
124
125 for(; n >= 16; s+=16, n-=16)
126 c = CRC32Wx4(c, CONST_WORD32_CAST(s));
127
128 for(; n >= 4; s+=4, n-=4)
129 c = CRC32W(c, *CONST_WORD32_CAST(s));
130
131 for(; n > 0; s++, n--)
132 c = CRC32B(c, *s);
133 }
134
135 void CRC32C_Update_ARMV8(const byte *s, size_t n, word32& c)
136 {
137 for(; !IsAligned<word32>(s) && n > 0; s++, n--)
138 c = CRC32CB(c, *s);
139
140 for(; n >= 16; s+=16, n-=16)
141 c = CRC32CWx4(c, CONST_WORD32_CAST(s));
142
143 for(; n >= 4; s+=4, n-=4)
144 c = CRC32CW(c, *CONST_WORD32_CAST(s));
145
146 for(; n > 0; s++, n--)
147 c = CRC32CB(c, *s);
148 }
149 #endif
150
151 #if (CRYPTOPP_SSE42_AVAILABLE)
152 void CRC32C_Update_SSE42(const byte *s, size_t n, word32& c)
153 {
154 for(; !IsAligned<word32>(s) && n > 0; s++, n--)
155 c = _mm_crc32_u8(c, *s);
156
157 for(; n >= 16; s+=16, n-=16)
158 {
159 c = _mm_crc32_u32(_mm_crc32_u32(_mm_crc32_u32(_mm_crc32_u32(c,
160 *CONST_WORD32_CAST(s+ 0)), *CONST_WORD32_CAST(s+ 4)),
161 *CONST_WORD32_CAST(s+ 8)), *CONST_WORD32_CAST(s+12));
162 }
163
164 for(; n >= 4; s+=4, n-=4)
165 c = _mm_crc32_u32(c, *CONST_WORD32_CAST(s));
166
167 for(; n > 0; s++, n--)
168 c = _mm_crc32_u8(c, *s);
169 }
170 #endif
171
172 NAMESPACE_END
arm_simd.h
Support functions for ARM and vector operations.
CRC32B
uint32_t CRC32B(uint32_t crc, uint8_t val)
CRC32 checksum.
Definition: arm_simd.h:30
pch.h
Precompiled header file.
word32
unsigned int word32
32-bit unsigned datatype
Definition: config_int.h:62
CRC32CW
uint32_t CRC32CW(uint32_t crc, uint32_t val)
CRC32-C checksum.
Definition: arm_simd.h:102
misc.h
Utility functions for the Crypto++ library.
CRC32Wx4
uint32_t CRC32Wx4(uint32_t crc, const uint32_t vals[4])
CRC32 checksum.
Definition: arm_simd.h:62
CRC32CB
uint32_t CRC32CB(uint32_t crc, uint8_t val)
CRC32-C checksum.
Definition: arm_simd.h:86
CRC32CWx4
uint32_t CRC32CWx4(uint32_t crc, const uint32_t vals[4])
CRC32-C checksum.
Definition: arm_simd.h:118
CryptoPP
Crypto++ library namespace.
CRC32W
uint32_t CRC32W(uint32_t crc, uint32_t val)
CRC32 checksum.
Definition: arm_simd.h:46
config.h
Library configuration file.