1 /* 2 * Copyright 2019 The libgav1 Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBGAV1_SRC_UTILS_CPU_H_ 18 #define LIBGAV1_SRC_UTILS_CPU_H_ 19 20 #include <cstdint> 21 22 namespace libgav1 { 23 24 #if defined(__i386__) || defined(__x86_64__) 25 #define LIBGAV1_X86 26 #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) 27 #define LIBGAV1_X86 28 #define LIBGAV1_X86_MSVC 29 #endif 30 31 #if defined(LIBGAV1_X86) 32 33 #if !defined(LIBGAV1_ENABLE_SSE4_1) 34 #define LIBGAV1_ENABLE_SSE4_1 1 35 #endif 36 37 #if LIBGAV1_ENABLE_SSE4_1 38 #if !defined(LIBGAV1_ENABLE_AVX2) 39 #define LIBGAV1_ENABLE_AVX2 1 40 #endif // !defined(LIBGAV1_ENABLE_AVX2) 41 #else // !LIBGAV1_ENABLE_SSE4_1 42 // Disable AVX2 when SSE4.1 is disabled as it may rely on shared components. 43 #undef LIBGAV1_ENABLE_AVX2 44 #define LIBGAV1_ENABLE_AVX2 0 45 #endif // LIBGAV1_ENABLE_SSE4_1 46 47 #else // !LIBGAV1_X86 48 49 #undef LIBGAV1_ENABLE_AVX2 50 #define LIBGAV1_ENABLE_AVX2 0 51 #undef LIBGAV1_ENABLE_SSE4_1 52 #define LIBGAV1_ENABLE_SSE4_1 0 53 54 #endif // LIBGAV1_X86 55 56 // For x86 LIBGAV1_TARGETING_* indicate the source being built is targeting 57 // (at least) that instruction set. This prevents disabling other instruction 58 // sets if the current instruction set isn't a global target, e.g., building 59 // *_avx2.cc w/-mavx2, but the remaining files without the flag. 60 #if LIBGAV1_ENABLE_AVX2 && defined(__AVX2__) 61 #define LIBGAV1_TARGETING_AVX2 1 62 #else 63 #define LIBGAV1_TARGETING_AVX2 0 64 #endif 65 66 // Note: LIBGAV1_X86_MSVC isn't completely correct for Visual Studio, but there 67 // is no equivalent to __SSE4_1__. LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS will be 68 // enabled in dsp.h to compensate for this. 69 #if LIBGAV1_ENABLE_SSE4_1 && (defined(__SSE4_1__) || defined(LIBGAV1_X86_MSVC)) 70 #define LIBGAV1_TARGETING_SSE4_1 1 71 #else 72 #define LIBGAV1_TARGETING_SSE4_1 0 73 #endif 74 75 #undef LIBGAV1_X86 76 77 #if !defined(LIBGAV1_ENABLE_NEON) 78 // TODO(jzern): add support for _M_ARM64. 79 #if defined(__ARM_NEON__) || defined(__aarch64__) || \ 80 (defined(_MSC_VER) && defined(_M_ARM)) 81 #define LIBGAV1_ENABLE_NEON 1 82 #else 83 #define LIBGAV1_ENABLE_NEON 0 84 #endif 85 #endif // !defined(LIBGAV1_ENABLE_NEON) 86 87 enum CpuFeatures : uint8_t { 88 kSSE2 = 1 << 0, 89 #define LIBGAV1_CPU_SSE2 (1 << 0) 90 kSSSE3 = 1 << 1, 91 #define LIBGAV1_CPU_SSSE3 (1 << 1) 92 kSSE4_1 = 1 << 2, 93 #define LIBGAV1_CPU_SSE4_1 (1 << 2) 94 kAVX = 1 << 3, 95 #define LIBGAV1_CPU_AVX (1 << 3) 96 kAVX2 = 1 << 4, 97 #define LIBGAV1_CPU_AVX2 (1 << 4) 98 kNEON = 1 << 5, 99 #define LIBGAV1_CPU_NEON (1 << 5) 100 }; 101 102 // Returns a bit-wise OR of CpuFeatures supported by this platform. 103 uint32_t GetCpuInfo(); 104 105 } // namespace libgav1 106 107 #endif // LIBGAV1_SRC_UTILS_CPU_H_ 108