1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkCpu.h" 9 #include "SkOnce.h" 10 11 #if !defined(__has_include) 12 #define __has_include(x) 0 13 #endif 14 15 #if defined(SK_CPU_X86) 16 #if defined(SK_BUILD_FOR_WIN) 17 #include <intrin.h> 18 static void cpuid (uint32_t abcd[4]) { __cpuid ((int*)abcd, 1); } 19 static void cpuid7(uint32_t abcd[4]) { __cpuidex((int*)abcd, 7, 0); } 20 static uint64_t xgetbv(uint32_t xcr) { return _xgetbv(xcr); } 21 #else 22 #include <cpuid.h> 23 #if !defined(__cpuid_count) // Old Mac Clang doesn't have this defined. 24 #define __cpuid_count(eax, ecx, a, b, c, d) \ 25 __asm__("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(eax), "2"(ecx)) 26 #endif 27 static void cpuid (uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); } 28 static void cpuid7(uint32_t abcd[4]) { 29 __cpuid_count(7, 0, abcd[0], abcd[1], abcd[2], abcd[3]); 30 } 31 static uint64_t xgetbv(uint32_t xcr) { 32 uint32_t eax, edx; 33 __asm__ __volatile__ ( "xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr)); 34 return (uint64_t)(edx) << 32 | eax; 35 } 36 #endif 37 38 static uint32_t read_cpu_features() { 39 uint32_t features = 0; 40 uint32_t abcd[4] = {0,0,0,0}; 41 42 // You might want to refer to http://www.sandpile.org/x86/cpuid.htm 43 44 cpuid(abcd); 45 if (abcd[3] & (1<<25)) { features |= SkCpu:: SSE1; } 46 if (abcd[3] & (1<<26)) { features |= SkCpu:: SSE2; } 47 if (abcd[2] & (1<< 0)) { features |= SkCpu:: SSE3; } 48 if (abcd[2] & (1<< 9)) { features |= SkCpu::SSSE3; } 49 if (abcd[2] & (1<<19)) { features |= SkCpu::SSE41; } 50 if (abcd[2] & (1<<20)) { features |= SkCpu::SSE42; } 51 52 if ((abcd[2] & (3<<26)) == (3<<26) // XSAVE + OSXSAVE 53 && (xgetbv(0) & (3<<1)) == (3<<1)) { // XMM and YMM state enabled. 54 if (abcd[2] & (1<<28)) { features |= SkCpu:: AVX; } 55 if (abcd[2] & (1<<29)) { features |= SkCpu::F16C; } 56 if (abcd[2] & (1<<12)) { features |= SkCpu:: FMA; } 57 58 cpuid7(abcd); 59 if (abcd[1] & (1<<5)) { features |= SkCpu::AVX2; } 60 if (abcd[1] & (1<<3)) { features |= SkCpu::BMI1; } 61 if (abcd[1] & (1<<8)) { features |= SkCpu::BMI2; } 62 63 if ((xgetbv(0) & (7<<5)) == (7<<5)) { // All ZMM state bits enabled too. 64 if (abcd[1] & (1<<16)) { features |= SkCpu::AVX512F; } 65 if (abcd[1] & (1<<17)) { features |= SkCpu::AVX512DQ; } 66 if (abcd[1] & (1<<21)) { features |= SkCpu::AVX512IFMA; } 67 if (abcd[1] & (1<<26)) { features |= SkCpu::AVX512PF; } 68 if (abcd[1] & (1<<27)) { features |= SkCpu::AVX512ER; } 69 if (abcd[1] & (1<<28)) { features |= SkCpu::AVX512CD; } 70 if (abcd[1] & (1<<30)) { features |= SkCpu::AVX512BW; } 71 if (abcd[1] & (1<<31)) { features |= SkCpu::AVX512VL; } 72 } 73 } 74 return features; 75 } 76 77 #elif defined(SK_CPU_ARM64) && __has_include(<sys/auxv.h>) 78 #include <sys/auxv.h> 79 80 static uint32_t read_cpu_features() { 81 const uint32_t kHWCAP_CRC32 = (1<<7); 82 83 uint32_t features = 0; 84 uint32_t hwcaps = getauxval(AT_HWCAP); 85 if (hwcaps & kHWCAP_CRC32) { features |= SkCpu::CRC32; } 86 return features; 87 } 88 89 #elif defined(SK_CPU_ARM32) && __has_include(<sys/auxv.h>) && \ 90 (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18) 91 // sys/auxv.h will always be present in the Android NDK due to unified 92 //headers, but getauxval is only defined for API >= 18. 93 #include <sys/auxv.h> 94 95 static uint32_t read_cpu_features() { 96 const uint32_t kHWCAP_NEON = (1<<12); 97 const uint32_t kHWCAP_VFPv4 = (1<<16); 98 99 uint32_t features = 0; 100 uint32_t hwcaps = getauxval(AT_HWCAP); 101 if (hwcaps & kHWCAP_NEON ) { 102 features |= SkCpu::NEON; 103 if (hwcaps & kHWCAP_VFPv4) { features |= SkCpu::NEON_FMA|SkCpu::VFP_FP16; } 104 } 105 return features; 106 } 107 108 #elif defined(SK_CPU_ARM32) && __has_include(<cpu-features.h>) 109 #include <cpu-features.h> 110 111 static uint32_t read_cpu_features() { 112 uint32_t features = 0; 113 uint64_t cpu_features = android_getCpuFeatures(); 114 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) { features |= SkCpu::NEON; } 115 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON_FMA) { features |= SkCpu::NEON_FMA; } 116 if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFP_FP16) { features |= SkCpu::VFP_FP16; } 117 return features; 118 } 119 120 #else 121 static uint32_t read_cpu_features() { 122 return 0; 123 } 124 125 #endif 126 127 uint32_t SkCpu::gCachedFeatures = 0; 128 129 void SkCpu::CacheRuntimeFeatures() { 130 static SkOnce once; 131 once([] { gCachedFeatures = read_cpu_features(); }); 132 } 133
