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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
#include "precomp.hpp"
#if defined WIN32 || defined _WIN32 || defined WINCE
#include <windows.h>
#if defined _MSC_VER
#if _MSC_VER >= 1400
#include <intrin.h>
#elif defined _M_IX86
static void __cpuid(int* cpuid_data, int)
{
__asm
{
push ebx
push edi
mov edi, cpuid_data
mov eax, 1
cpuid
mov [edi], eax
mov [edi + 4], ebx
mov [edi + 8], ecx
mov [edi + 12], edx
pop edi
pop ebx
}
}
static void __cpuidex(int* cpuid_data, int, int)
{
__asm
{
push edi
mov edi, cpuid_data
mov eax, 7
mov ecx, 0
cpuid
mov [edi], eax
mov [edi + 4], ebx
mov [edi + 8], ecx
mov [edi + 12], edx
pop edi
}
}
#endif
#endif
#endif
#if defined ANDROID || defined __linux__
# include <unistd.h>
# include <fcntl.h>
# include <elf.h>
# include <linux/auxvec.h>
#endif
#if defined __linux__ || defined __APPLE__ || defined __EMSCRIPTEN__
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#if defined ANDROID
#include <sys/sysconf.h>
#endif
#endif
#ifdef ANDROID
# include <android/log.h>
#endif
struct HWFeatures
{
enum { MAX_FEATURE = CV_HARDWARE_MAX_FEATURE };
HWFeatures(void)
{
memset( have, 0, sizeof(have) );
x86_family = 0;
}
static HWFeatures initialize(void)
{
HWFeatures f;
int cpuid_data[4] = { 0, 0, 0, 0 };
#if defined _MSC_VER && (defined _M_IX86 || defined _M_X64)
__cpuid(cpuid_data, 1);
#elif defined __GNUC__ && (defined __i386__ || defined __x86_64__)
#ifdef __x86_64__
asm __volatile__
(
"movl $1, %%eax\n\t"
"cpuid\n\t"
:[eax]"=a"(cpuid_data[0]),[ebx]"=b"(cpuid_data[1]),[ecx]"=c"(cpuid_data[2]),[edx]"=d"(cpuid_data[3])
:
: "cc"
);
#else
asm volatile
(
"pushl %%ebx\n\t"
"movl $1,%%eax\n\t"
"cpuid\n\t"
"popl %%ebx\n\t"
: "=a"(cpuid_data[0]), "=c"(cpuid_data[2]), "=d"(cpuid_data[3])
:
: "cc"
);
#endif
#endif
f.x86_family = (cpuid_data[0] >> 8) & 15;
if( f.x86_family >= 6 )
{
f.have[CV_CPU_MMX] = (cpuid_data[3] & (1 << 23)) != 0;
f.have[CV_CPU_SSE] = (cpuid_data[3] & (1<<25)) != 0;
f.have[CV_CPU_SSE2] = (cpuid_data[3] & (1<<26)) != 0;
f.have[CV_CPU_SSE3] = (cpuid_data[2] & (1<<0)) != 0;
f.have[CV_CPU_SSSE3] = (cpuid_data[2] & (1<<9)) != 0;
f.have[CV_CPU_FMA3] = (cpuid_data[2] & (1<<12)) != 0;
f.have[CV_CPU_SSE4_1] = (cpuid_data[2] & (1<<19)) != 0;
f.have[CV_CPU_SSE4_2] = (cpuid_data[2] & (1<<20)) != 0;
f.have[CV_CPU_POPCNT] = (cpuid_data[2] & (1<<23)) != 0;
f.have[CV_CPU_AVX] = (((cpuid_data[2] & (1<<28)) != 0)&&((cpuid_data[2] & (1<<27)) != 0));//OS uses XSAVE_XRSTORE and CPU support AVX
// make the second call to the cpuid command in order to get
// information about extended features like AVX2
#if defined _MSC_VER && (defined _M_IX86 || defined _M_X64)
__cpuidex(cpuid_data, 7, 0);
#elif defined __GNUC__ && (defined __i386__ || defined __x86_64__)
#ifdef __x86_64__
asm __volatile__
(
"movl $7, %%eax\n\t"
"movl $0, %%ecx\n\t"
"cpuid\n\t"
:[eax]"=a"(cpuid_data[0]),[ebx]"=b"(cpuid_data[1]),[ecx]"=c"(cpuid_data[2]),[edx]"=d"(cpuid_data[3])
:
: "cc"
);
#else
asm volatile
(
"pushl %%ebx\n\t"
"movl $7,%%eax\n\t"
"movl $0,%%ecx\n\t"
"cpuid\n\t"
"movl %%ebx, %0\n\t"
"popl %%ebx\n\t"
: "=r"(cpuid_data[1]), "=c"(cpuid_data[2])
:
: "cc"
);
#endif
#endif
f.have[CV_CPU_AVX2] = (cpuid_data[1] & (1<<5)) != 0;
f.have[CV_CPU_AVX_512F] = (cpuid_data[1] & (1<<16)) != 0;
f.have[CV_CPU_AVX_512DQ] = (cpuid_data[1] & (1<<17)) != 0;
f.have[CV_CPU_AVX_512IFMA512] = (cpuid_data[1] & (1<<21)) != 0;
f.have[CV_CPU_AVX_512PF] = (cpuid_data[1] & (1<<26)) != 0;
f.have[CV_CPU_AVX_512ER] = (cpuid_data[1] & (1<<27)) != 0;
f.have[CV_CPU_AVX_512CD] = (cpuid_data[1] & (1<<28)) != 0;
f.have[CV_CPU_AVX_512BW] = (cpuid_data[1] & (1<<30)) != 0;
f.have[CV_CPU_AVX_512VL] = (cpuid_data[1] & (1<<31)) != 0;
f.have[CV_CPU_AVX_512VBMI] = (cpuid_data[2] & (1<<1)) != 0;
}
#if defined ANDROID || defined __linux__
#ifdef __aarch64__
f.have[CV_CPU_NEON] = true;
#else
int cpufile = open("/proc/self/auxv", O_RDONLY);
if (cpufile >= 0)
{
Elf32_auxv_t auxv;
const size_t size_auxv_t = sizeof(auxv);
while ((size_t)read(cpufile, &auxv, size_auxv_t) == size_auxv_t)
{
if (auxv.a_type == AT_HWCAP)
{
f.have[CV_CPU_NEON] = (auxv.a_un.a_val & 4096) != 0;
break;
}
}
close(cpufile);
}
#endif
#elif (defined __clang__ || defined __APPLE__) && (defined __ARM_NEON__ || (defined __ARM_NEON && defined __aarch64__))
f.have[CV_CPU_NEON] = true;
#endif
return f;
}
int x86_family;
bool have[MAX_FEATURE+1];
};
static HWFeatures featuresEnabled = HWFeatures::initialize(), featuresDisabled = HWFeatures();
static HWFeatures* currentFeatures = &featuresEnabled;
volatile bool useOptimizedFlag = true;
namespace cv { namespace hal {
bool checkHardwareSupport(int feature)
{
// CV_DbgAssert( 0 <= feature && feature <= CV_HARDWARE_MAX_FEATURE );
return currentFeatures->have[feature];
}
void setUseOptimized( bool flag )
{
useOptimizedFlag = flag;
currentFeatures = flag ? &featuresEnabled : &featuresDisabled;
}
bool useOptimized(void)
{
return useOptimizedFlag;
}
}}