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comparison: media/libyuv/source/cpu_id.cc
media/libyuv/source/cpu_id.cc
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| 1 /* | |
| 2 * Copyright 2011 The LibYuv Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include "libyuv/cpu_id.h" | |
| 12 | |
| 13 #ifdef _MSC_VER | |
| 14 #include <intrin.h> // For __cpuidex() | |
| 15 #endif | |
| 16 #if !defined(__pnacl__) && !defined(__CLR_VER) && \ | |
| 17 !defined(__native_client__) && defined(_M_X64) && \ | |
| 18 defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219) | |
| 19 #include <immintrin.h> // For _xgetbv() | |
| 20 #endif | |
| 21 | |
| 22 #if !defined(__native_client__) | |
| 23 #include <stdlib.h> // For getenv() | |
| 24 #endif | |
| 25 | |
| 26 // For ArmCpuCaps() but unittested on all platforms | |
| 27 #include <stdio.h> | |
| 28 #include <string.h> | |
| 29 | |
| 30 #include "libyuv/basic_types.h" // For CPU_X86 | |
| 31 | |
| 32 #ifdef __cplusplus | |
| 33 namespace libyuv { | |
| 34 extern "C" { | |
| 35 #endif | |
| 36 | |
| 37 // For functions that use the stack and have runtime checks for overflow, | |
| 38 // use SAFEBUFFERS to avoid additional check. | |
| 39 #if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219) | |
| 40 #define SAFEBUFFERS __declspec(safebuffers) | |
| 41 #else | |
| 42 #define SAFEBUFFERS | |
| 43 #endif | |
| 44 | |
| 45 // Low level cpuid for X86. Returns zeros on other CPUs. | |
| 46 #if !defined(__pnacl__) && !defined(__CLR_VER) && \ | |
| 47 (defined(_M_IX86) || defined(_M_X64) || \ | |
| 48 defined(__i386__) || defined(__x86_64__)) | |
| 49 LIBYUV_API | |
| 50 void CpuId(uint32 info_eax, uint32 info_ecx, uint32* cpu_info) { | |
| 51 #if defined(_MSC_VER) | |
| 52 #if (_MSC_FULL_VER >= 160040219) | |
| 53 __cpuidex((int*)(cpu_info), info_eax, info_ecx); | |
| 54 #elif defined(_M_IX86) | |
| 55 __asm { | |
| 56 mov eax, info_eax | |
| 57 mov ecx, info_ecx | |
| 58 mov edi, cpu_info | |
| 59 cpuid | |
| 60 mov [edi], eax | |
| 61 mov [edi + 4], ebx | |
| 62 mov [edi + 8], ecx | |
| 63 mov [edi + 12], edx | |
| 64 } | |
| 65 #else | |
| 66 if (info_ecx == 0) { | |
| 67 __cpuid((int*)(cpu_info), info_eax); | |
| 68 } else { | |
| 69 cpu_info[3] = cpu_info[2] = cpu_info[1] = cpu_info[0] = 0; | |
| 70 } | |
| 71 #endif | |
| 72 #else // defined(_MSC_VER) | |
| 73 uint32 info_ebx, info_edx; | |
| 74 asm volatile ( // NOLINT | |
| 75 #if defined( __i386__) && defined(__PIC__) | |
| 76 // Preserve ebx for fpic 32 bit. | |
| 77 "mov %%ebx, %%edi \n" | |
| 78 "cpuid \n" | |
| 79 "xchg %%edi, %%ebx \n" | |
| 80 : "=D" (info_ebx), | |
| 81 #else | |
| 82 "cpuid \n" | |
| 83 : "=b" (info_ebx), | |
| 84 #endif // defined( __i386__) && defined(__PIC__) | |
| 85 "+a" (info_eax), "+c" (info_ecx), "=d" (info_edx)); | |
| 86 cpu_info[0] = info_eax; | |
| 87 cpu_info[1] = info_ebx; | |
| 88 cpu_info[2] = info_ecx; | |
| 89 cpu_info[3] = info_edx; | |
| 90 #endif // defined(_MSC_VER) | |
| 91 } | |
| 92 | |
| 93 #if !defined(__native_client__) | |
| 94 #define HAS_XGETBV | |
| 95 // X86 CPUs have xgetbv to detect OS saves high parts of ymm registers. | |
| 96 int TestOsSaveYmm() { | |
| 97 uint32 xcr0 = 0u; | |
| 98 #if defined(_MSC_VER) && defined(_XCR_XFEATURE_ENABLED_MASK) | |
| 99 xcr0 = (uint32)(_xgetbv(_XCR_XFEATURE_ENABLED_MASK)); | |
| 100 #elif defined(_MSC_VER) && defined(_M_IX86) | |
| 101 __asm { | |
| 102 xor ecx, ecx // xcr 0 | |
| 103 _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0 // For VS2010 and earlier. | |
| 104 mov xcr0, eax | |
| 105 } | |
| 106 #elif defined(__i386__) || defined(__x86_64__) | |
| 107 asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcr0) : "c" (0) : "%edx"); | |
| 108 #endif // defined(_MSC_VER) | |
| 109 return((xcr0 & 6) == 6); // Is ymm saved? | |
| 110 } | |
| 111 #endif // !defined(__native_client__) | |
| 112 #else | |
| 113 LIBYUV_API | |
| 114 void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info) { | |
| 115 cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0; | |
| 116 } | |
| 117 #endif | |
| 118 | |
| 119 // based on libvpx arm_cpudetect.c | |
| 120 // For Arm, but public to allow testing on any CPU | |
| 121 LIBYUV_API SAFEBUFFERS | |
| 122 int ArmCpuCaps(const char* cpuinfo_name) { | |
| 123 FILE* f = fopen(cpuinfo_name, "r"); | |
| 124 if (f) { | |
| 125 char cpuinfo_line[512]; | |
| 126 while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) { | |
| 127 if (memcmp(cpuinfo_line, "Features", 8) == 0) { | |
| 128 char* p = strstr(cpuinfo_line, " neon"); | |
| 129 if (p && (p[5] == ' ' || p[5] == '\n')) { | |
| 130 fclose(f); | |
| 131 return kCpuHasNEON; | |
| 132 } | |
| 133 } | |
| 134 } | |
| 135 fclose(f); | |
| 136 } | |
| 137 return 0; | |
| 138 } | |
| 139 | |
| 140 #if defined(__mips__) && defined(__linux__) | |
| 141 static int MipsCpuCaps(const char* search_string) { | |
| 142 const char* file_name = "/proc/cpuinfo"; | |
| 143 char cpuinfo_line[256]; | |
| 144 FILE* f = NULL; | |
| 145 if ((f = fopen(file_name, "r")) != NULL) { | |
| 146 while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f) != NULL) { | |
| 147 if (strstr(cpuinfo_line, search_string) != NULL) { | |
| 148 fclose(f); | |
| 149 return kCpuHasMIPS_DSP; | |
| 150 } | |
| 151 } | |
| 152 fclose(f); | |
| 153 } | |
| 154 /* Did not find string in the proc file, or not Linux ELF. */ | |
| 155 return 0; | |
| 156 } | |
| 157 #endif | |
| 158 | |
| 159 // CPU detect function for SIMD instruction sets. | |
| 160 LIBYUV_API | |
| 161 int cpu_info_ = kCpuInit; // cpu_info is not initialized yet. | |
| 162 | |
| 163 // Test environment variable for disabling CPU features. Any non-zero value | |
| 164 // to disable. Zero ignored to make it easy to set the variable on/off. | |
| 165 #if !defined(__native_client__) && !defined(_M_ARM) | |
| 166 | |
| 167 static LIBYUV_BOOL TestEnv(const char* name) { | |
| 168 const char* var = getenv(name); | |
| 169 if (var) { | |
| 170 if (var[0] != '0') { | |
| 171 return LIBYUV_TRUE; | |
| 172 } | |
| 173 } | |
| 174 return LIBYUV_FALSE; | |
| 175 } | |
| 176 #else // nacl does not support getenv(). | |
| 177 static LIBYUV_BOOL TestEnv(const char*) { | |
| 178 return LIBYUV_FALSE; | |
| 179 } | |
| 180 #endif | |
| 181 | |
| 182 LIBYUV_API SAFEBUFFERS | |
| 183 int InitCpuFlags(void) { | |
| 184 #if !defined(__pnacl__) && !defined(__CLR_VER) && defined(CPU_X86) | |
| 185 | |
| 186 uint32 cpu_info1[4] = { 0, 0, 0, 0 }; | |
| 187 uint32 cpu_info7[4] = { 0, 0, 0, 0 }; | |
| 188 CpuId(1, 0, cpu_info1); | |
| 189 CpuId(7, 0, cpu_info7); | |
| 190 cpu_info_ = ((cpu_info1[3] & 0x04000000) ? kCpuHasSSE2 : 0) | | |
| 191 ((cpu_info1[2] & 0x00000200) ? kCpuHasSSSE3 : 0) | | |
| 192 ((cpu_info1[2] & 0x00080000) ? kCpuHasSSE41 : 0) | | |
| 193 ((cpu_info1[2] & 0x00100000) ? kCpuHasSSE42 : 0) | | |
| 194 ((cpu_info7[1] & 0x00000200) ? kCpuHasERMS : 0) | | |
| 195 ((cpu_info1[2] & 0x00001000) ? kCpuHasFMA3 : 0) | | |
| 196 kCpuHasX86; | |
| 197 #ifdef HAS_XGETBV | |
| 198 if ((cpu_info1[2] & 0x18000000) == 0x18000000 && // AVX and OSSave | |
| 199 TestOsSaveYmm()) { // Saves YMM. | |
| 200 cpu_info_ |= ((cpu_info7[1] & 0x00000020) ? kCpuHasAVX2 : 0) | | |
| 201 kCpuHasAVX; | |
| 202 } | |
| 203 #endif | |
| 204 // Environment variable overrides for testing. | |
| 205 if (TestEnv("LIBYUV_DISABLE_X86")) { | |
| 206 cpu_info_ &= ~kCpuHasX86; | |
| 207 } | |
| 208 if (TestEnv("LIBYUV_DISABLE_SSE2")) { | |
| 209 cpu_info_ &= ~kCpuHasSSE2; | |
| 210 } | |
| 211 if (TestEnv("LIBYUV_DISABLE_SSSE3")) { | |
| 212 cpu_info_ &= ~kCpuHasSSSE3; | |
| 213 } | |
| 214 if (TestEnv("LIBYUV_DISABLE_SSE41")) { | |
| 215 cpu_info_ &= ~kCpuHasSSE41; | |
| 216 } | |
| 217 if (TestEnv("LIBYUV_DISABLE_SSE42")) { | |
| 218 cpu_info_ &= ~kCpuHasSSE42; | |
| 219 } | |
| 220 if (TestEnv("LIBYUV_DISABLE_AVX")) { | |
| 221 cpu_info_ &= ~kCpuHasAVX; | |
| 222 } | |
| 223 if (TestEnv("LIBYUV_DISABLE_AVX2")) { | |
| 224 cpu_info_ &= ~kCpuHasAVX2; | |
| 225 } | |
| 226 if (TestEnv("LIBYUV_DISABLE_ERMS")) { | |
| 227 cpu_info_ &= ~kCpuHasERMS; | |
| 228 } | |
| 229 if (TestEnv("LIBYUV_DISABLE_FMA3")) { | |
| 230 cpu_info_ &= ~kCpuHasFMA3; | |
| 231 } | |
| 232 #elif defined(__mips__) && defined(__linux__) | |
| 233 // Linux mips parse text file for dsp detect. | |
| 234 cpu_info_ = MipsCpuCaps("dsp"); // set kCpuHasMIPS_DSP. | |
| 235 #if defined(__mips_dspr2) | |
| 236 cpu_info_ |= kCpuHasMIPS_DSPR2; | |
| 237 #endif | |
| 238 cpu_info_ |= kCpuHasMIPS; | |
| 239 | |
| 240 if (getenv("LIBYUV_DISABLE_MIPS")) { | |
| 241 cpu_info_ &= ~kCpuHasMIPS; | |
| 242 } | |
| 243 if (getenv("LIBYUV_DISABLE_MIPS_DSP")) { | |
| 244 cpu_info_ &= ~kCpuHasMIPS_DSP; | |
| 245 } | |
| 246 if (getenv("LIBYUV_DISABLE_MIPS_DSPR2")) { | |
| 247 cpu_info_ &= ~kCpuHasMIPS_DSPR2; | |
| 248 } | |
| 249 #elif defined(__arm__) | |
| 250 #if defined(__linux__) && (defined(__ARM_NEON__) || defined(LIBYUV_NEON)) && \ | |
| 251 !defined(__native_client__) | |
| 252 // Linux arm parse text file for neon detect. | |
| 253 cpu_info_ = ArmCpuCaps("/proc/cpuinfo"); | |
| 254 #elif defined(__ARM_NEON__) || defined(__native_client__) | |
| 255 // gcc -mfpu=neon defines __ARM_NEON__ | |
| 256 // Enable Neon if you want support for Neon and Arm, and use MaskCpuFlags | |
| 257 // to disable Neon on devices that do not have it. | |
| 258 cpu_info_ = kCpuHasNEON; | |
| 259 #endif | |
| 260 cpu_info_ |= kCpuHasARM; | |
| 261 if (TestEnv("LIBYUV_DISABLE_NEON")) { | |
| 262 cpu_info_ &= ~kCpuHasNEON; | |
| 263 } | |
| 264 #endif // __arm__ | |
| 265 if (TestEnv("LIBYUV_DISABLE_ASM")) { | |
| 266 cpu_info_ = 0; | |
| 267 } | |
| 268 return cpu_info_; | |
| 269 } | |
| 270 | |
| 271 LIBYUV_API | |
| 272 void MaskCpuFlags(int enable_flags) { | |
| 273 cpu_info_ = InitCpuFlags() & enable_flags; | |
| 274 } | |
| 275 | |
| 276 #ifdef __cplusplus | |
| 277 } // extern "C" | |
| 278 } // namespace libyuv | |
| 279 #endif |
