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#if defined(_MSC_VER) && !defined(__clang__) 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 33namespace libyuv { 34extern "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__)) 49LIBYUV_API 50void CpuId(uint32 info_eax, uint32 info_ecx, uint32* cpu_info) { 51#if defined(_MSC_VER) && !defined(__clang__) 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. 96int TestOsSaveYmm() { 97 uint32 xcr0 = 0u; 98#if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219) 99 xcr0 = (uint32)(_xgetbv(0)); // VS2010 SP1 required. 100#elif 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 113LIBYUV_API 114void 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 121LIBYUV_API SAFEBUFFERS 122int ArmCpuCaps(const char* cpuinfo_name) { 123 char cpuinfo_line[512]; 124 FILE* f = fopen(cpuinfo_name, "r"); 125 if (!f) { 126 // Assume Neon if /proc/cpuinfo is unavailable. 127 // This will occur for Chrome sandbox for Pepper or Render process. 128 return kCpuHasNEON; 129 } 130 while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) { 131 if (memcmp(cpuinfo_line, "Features", 8) == 0) { 132 char* p = strstr(cpuinfo_line, " neon"); 133 if (p && (p[5] == ' ' || p[5] == '\n')) { 134 fclose(f); 135 return kCpuHasNEON; 136 } 137 } 138 } 139 fclose(f); 140 return 0; 141} 142 143#if defined(__mips__) && defined(__linux__) 144static int MipsCpuCaps(const char* search_string) { 145 char cpuinfo_line[512]; 146 const char* file_name = "/proc/cpuinfo"; 147 FILE* f = fopen(file_name, "r"); 148 if (!f) { 149 // Assume DSP if /proc/cpuinfo is unavailable. 150 // This will occur for Chrome sandbox for Pepper or Render process. 151 return kCpuHasMIPS_DSP; 152 } 153 while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f) != NULL) { 154 if (strstr(cpuinfo_line, search_string) != NULL) { 155 fclose(f); 156 return kCpuHasMIPS_DSP; 157 } 158 } 159 fclose(f); 160 return 0; 161} 162#endif 163 164// CPU detect function for SIMD instruction sets. 165LIBYUV_API 166int cpu_info_ = kCpuInit; // cpu_info is not initialized yet. 167 168// Test environment variable for disabling CPU features. Any non-zero value 169// to disable. Zero ignored to make it easy to set the variable on/off. 170#if !defined(__native_client__) && !defined(_M_ARM) 171 172static LIBYUV_BOOL TestEnv(const char* name) { 173 const char* var = getenv(name); 174 if (var) { 175 if (var[0] != '0') { 176 return LIBYUV_TRUE; 177 } 178 } 179 return LIBYUV_FALSE; 180} 181#else // nacl does not support getenv(). 182static LIBYUV_BOOL TestEnv(const char*) { 183 return LIBYUV_FALSE; 184} 185#endif 186 187LIBYUV_API SAFEBUFFERS 188int InitCpuFlags(void) { 189#if !defined(__pnacl__) && !defined(__CLR_VER) && defined(CPU_X86) 190 191 uint32 cpu_info0[4] = { 0, 0, 0, 0 }; 192 uint32 cpu_info1[4] = { 0, 0, 0, 0 }; 193 uint32 cpu_info7[4] = { 0, 0, 0, 0 }; 194 CpuId(0, 0, cpu_info0); 195 CpuId(1, 0, cpu_info1); 196 if (cpu_info0[0] >= 7) { 197 CpuId(7, 0, cpu_info7); 198 } 199 cpu_info_ = ((cpu_info1[3] & 0x04000000) ? kCpuHasSSE2 : 0) | 200 ((cpu_info1[2] & 0x00000200) ? kCpuHasSSSE3 : 0) | 201 ((cpu_info1[2] & 0x00080000) ? kCpuHasSSE41 : 0) | 202 ((cpu_info1[2] & 0x00100000) ? kCpuHasSSE42 : 0) | 203 ((cpu_info7[1] & 0x00000200) ? kCpuHasERMS : 0) | 204 ((cpu_info1[2] & 0x00001000) ? kCpuHasFMA3 : 0) | 205 kCpuHasX86; 206 207#ifdef HAS_XGETBV 208 if ((cpu_info1[2] & 0x18000000) == 0x18000000 && // AVX and OSSave 209 TestOsSaveYmm()) { // Saves YMM. 210 cpu_info_ |= ((cpu_info7[1] & 0x00000020) ? kCpuHasAVX2 : 0) | 211 kCpuHasAVX; 212 } 213#endif 214 // Environment variable overrides for testing. 215 if (TestEnv("LIBYUV_DISABLE_X86")) { 216 cpu_info_ &= ~kCpuHasX86; 217 } 218 if (TestEnv("LIBYUV_DISABLE_SSE2")) { 219 cpu_info_ &= ~kCpuHasSSE2; 220 } 221 if (TestEnv("LIBYUV_DISABLE_SSSE3")) { 222 cpu_info_ &= ~kCpuHasSSSE3; 223 } 224 if (TestEnv("LIBYUV_DISABLE_SSE41")) { 225 cpu_info_ &= ~kCpuHasSSE41; 226 } 227 if (TestEnv("LIBYUV_DISABLE_SSE42")) { 228 cpu_info_ &= ~kCpuHasSSE42; 229 } 230 if (TestEnv("LIBYUV_DISABLE_AVX")) { 231 cpu_info_ &= ~kCpuHasAVX; 232 } 233 if (TestEnv("LIBYUV_DISABLE_AVX2")) { 234 cpu_info_ &= ~kCpuHasAVX2; 235 } 236 if (TestEnv("LIBYUV_DISABLE_ERMS")) { 237 cpu_info_ &= ~kCpuHasERMS; 238 } 239 if (TestEnv("LIBYUV_DISABLE_FMA3")) { 240 cpu_info_ &= ~kCpuHasFMA3; 241 } 242#elif defined(__mips__) && defined(__linux__) 243 // Linux mips parse text file for dsp detect. 244 cpu_info_ = MipsCpuCaps("dsp"); // set kCpuHasMIPS_DSP. 245#if defined(__mips_dspr2) 246 cpu_info_ |= kCpuHasMIPS_DSPR2; 247#endif 248 cpu_info_ |= kCpuHasMIPS; 249 250 if (getenv("LIBYUV_DISABLE_MIPS")) { 251 cpu_info_ &= ~kCpuHasMIPS; 252 } 253 if (getenv("LIBYUV_DISABLE_MIPS_DSP")) { 254 cpu_info_ &= ~kCpuHasMIPS_DSP; 255 } 256 if (getenv("LIBYUV_DISABLE_MIPS_DSPR2")) { 257 cpu_info_ &= ~kCpuHasMIPS_DSPR2; 258 } 259#elif defined(__arm__) 260// gcc -mfpu=neon defines __ARM_NEON__ 261// __ARM_NEON__ generates code that requires Neon. NaCL also requires Neon. 262// For Linux, /proc/cpuinfo can be tested but without that assume Neon. 263#if defined(__ARM_NEON__) || defined(__native_client__) || !defined(__linux__) 264 cpu_info_ = kCpuHasNEON; 265#else 266 // Linux arm parse text file for neon detect. 267 cpu_info_ = ArmCpuCaps("/proc/cpuinfo"); 268#endif 269 cpu_info_ |= kCpuHasARM; 270 if (TestEnv("LIBYUV_DISABLE_NEON")) { 271 cpu_info_ &= ~kCpuHasNEON; 272 } 273#endif // __arm__ 274 if (TestEnv("LIBYUV_DISABLE_ASM")) { 275 cpu_info_ = 0; 276 } 277 return cpu_info_; 278} 279 280LIBYUV_API 281void MaskCpuFlags(int enable_flags) { 282 cpu_info_ = InitCpuFlags() & enable_flags; 283} 284 285#ifdef __cplusplus 286} // extern "C" 287} // namespace libyuv 288#endif 289