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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* Runtime CPU detection
* (C) 2009-2010,2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_CPUID_H__
#define BOTAN_CPUID_H__
#include <botan/types.h>
#include <iosfwd>
namespace Botan {
/**
* A class handling runtime CPU feature detection
*/
class BOTAN_DLL CPUID
{
public:
/**
* Probe the CPU and see what extensions are supported
*/
static void initialize();
/**
* Return a best guess of the cache line size
*/
static size_t cache_line_size() { initialize(); return g_cache_line_size; }
/**
* Check if the processor supports AltiVec/VMX
*/
static bool has_altivec() { initialize(); return g_altivec_capable; }
/**
* Check if the processor supports RDTSC
*/
static bool has_rdtsc()
{ return x86_processor_flags_has(CPUID_RDTSC_BIT); }
/**
* Check if the processor supports SSE2
*/
static bool has_sse2()
{ return x86_processor_flags_has(CPUID_SSE2_BIT); }
/**
* Check if the processor supports SSSE3
*/
static bool has_ssse3()
{ return x86_processor_flags_has(CPUID_SSSE3_BIT); }
/**
* Check if the processor supports SSE4.1
*/
static bool has_sse41()
{ return x86_processor_flags_has(CPUID_SSE41_BIT); }
/**
* Check if the processor supports SSE4.2
*/
static bool has_sse42()
{ return x86_processor_flags_has(CPUID_SSE42_BIT); }
/**
* Check if the processor supports AVX2
*/
static bool has_avx2()
{ return x86_processor_flags_has(CPUID_AVX2_BIT); }
/**
* Check if the processor supports AVX-512F
*/
static bool has_avx512f()
{ return x86_processor_flags_has(CPUID_AVX512F_BIT); }
/**
* Check if the processor supports BMI2
*/
static bool has_bmi2()
{ return x86_processor_flags_has(CPUID_BMI2_BIT); }
/**
* Check if the processor supports AES-NI
*/
static bool has_aes_ni()
{ return x86_processor_flags_has(CPUID_AESNI_BIT); }
/**
* Check if the processor supports CLMUL
*/
static bool has_clmul()
{ return x86_processor_flags_has(CPUID_CLMUL_BIT); }
/**
* Check if the processor supports Intel SHA extension
*/
static bool has_intel_sha()
{ return x86_processor_flags_has(CPUID_SHA_BIT); }
/**
* Check if the processor supports ADX extension
*/
static bool has_adx()
{ return x86_processor_flags_has(CPUID_ADX_BIT); }
/**
* Check if the processor supports RDRAND
*/
static bool has_rdrand()
{ return x86_processor_flags_has(CPUID_RDRAND_BIT); }
/**
* Check if the processor supports RDSEED
*/
static bool has_rdseed()
{ return x86_processor_flags_has(CPUID_RDSEED_BIT); }
static bool has_simd_32();
static void print(std::ostream& o);
private:
enum CPUID_bits {
CPUID_RDTSC_BIT = 4,
CPUID_SSE2_BIT = 26,
CPUID_CLMUL_BIT = 33,
CPUID_SSSE3_BIT = 41,
CPUID_SSE41_BIT = 51,
CPUID_SSE42_BIT = 52,
CPUID_AESNI_BIT = 57,
CPUID_RDRAND_BIT = 62,
CPUID_AVX2_BIT = 64+5,
CPUID_BMI2_BIT = 64+8,
CPUID_AVX512F_BIT = 64+16,
CPUID_RDSEED_BIT = 64+18,
CPUID_ADX_BIT = 64+19,
CPUID_SHA_BIT = 64+29,
};
static bool x86_processor_flags_has(u64bit bit)
{
if(!g_initialized)
initialize();
return ((g_x86_processor_flags[bit/64] >> (bit % 64)) & 1);
}
static bool g_initialized;
static u64bit g_x86_processor_flags[2];
static size_t g_cache_line_size;
static bool g_altivec_capable;
};
}
#endif
|
