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Diffstat (limited to 'src/utils/cpu.h')
| -rw-r--r-- | src/utils/cpu.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/utils/cpu.h b/src/utils/cpu.h new file mode 100644 index 0000000..630b251 --- /dev/null +++ b/src/utils/cpu.h @@ -0,0 +1,107 @@ +/* + * Copyright 2019 The libgav1 Authors + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef LIBGAV1_SRC_UTILS_CPU_H_ +#define LIBGAV1_SRC_UTILS_CPU_H_ + +#include <cstdint> + +namespace libgav1 { + +#if defined(__i386__) || defined(__x86_64__) +#define LIBGAV1_X86 +#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) +#define LIBGAV1_X86 +#define LIBGAV1_X86_MSVC +#endif + +#if defined(LIBGAV1_X86) + +#if !defined(LIBGAV1_ENABLE_SSE4_1) +#define LIBGAV1_ENABLE_SSE4_1 1 +#endif + +#if LIBGAV1_ENABLE_SSE4_1 +#if !defined(LIBGAV1_ENABLE_AVX2) +#define LIBGAV1_ENABLE_AVX2 1 +#endif // !defined(LIBGAV1_ENABLE_AVX2) +#else // !LIBGAV1_ENABLE_SSE4_1 +// Disable AVX2 when SSE4.1 is disabled as it may rely on shared components. +#undef LIBGAV1_ENABLE_AVX2 +#define LIBGAV1_ENABLE_AVX2 0 +#endif // LIBGAV1_ENABLE_SSE4_1 + +#else // !LIBGAV1_X86 + +#undef LIBGAV1_ENABLE_AVX2 +#define LIBGAV1_ENABLE_AVX2 0 +#undef LIBGAV1_ENABLE_SSE4_1 +#define LIBGAV1_ENABLE_SSE4_1 0 + +#endif // LIBGAV1_X86 + +// For x86 LIBGAV1_TARGETING_* indicate the source being built is targeting +// (at least) that instruction set. This prevents disabling other instruction +// sets if the current instruction set isn't a global target, e.g., building +// *_avx2.cc w/-mavx2, but the remaining files without the flag. +#if LIBGAV1_ENABLE_AVX2 && defined(__AVX2__) +#define LIBGAV1_TARGETING_AVX2 1 +#else +#define LIBGAV1_TARGETING_AVX2 0 +#endif + +// Note: LIBGAV1_X86_MSVC isn't completely correct for Visual Studio, but there +// is no equivalent to __SSE4_1__. LIBGAV1_ENABLE_ALL_DSP_FUNCTIONS will be +// enabled in dsp.h to compensate for this. +#if LIBGAV1_ENABLE_SSE4_1 && (defined(__SSE4_1__) || defined(LIBGAV1_X86_MSVC)) +#define LIBGAV1_TARGETING_SSE4_1 1 +#else +#define LIBGAV1_TARGETING_SSE4_1 0 +#endif + +#undef LIBGAV1_X86 + +#if !defined(LIBGAV1_ENABLE_NEON) +// TODO(jzern): add support for _M_ARM64. +#if defined(__ARM_NEON__) || defined(__aarch64__) || \ + (defined(_MSC_VER) && defined(_M_ARM)) +#define LIBGAV1_ENABLE_NEON 1 +#else +#define LIBGAV1_ENABLE_NEON 0 +#endif +#endif // !defined(LIBGAV1_ENABLE_NEON) + +enum CpuFeatures : uint8_t { + kSSE2 = 1 << 0, +#define LIBGAV1_CPU_SSE2 (1 << 0) + kSSSE3 = 1 << 1, +#define LIBGAV1_CPU_SSSE3 (1 << 1) + kSSE4_1 = 1 << 2, +#define LIBGAV1_CPU_SSE4_1 (1 << 2) + kAVX = 1 << 3, +#define LIBGAV1_CPU_AVX (1 << 3) + kAVX2 = 1 << 4, +#define LIBGAV1_CPU_AVX2 (1 << 4) + kNEON = 1 << 5, +#define LIBGAV1_CPU_NEON (1 << 5) +}; + +// Returns a bit-wise OR of CpuFeatures supported by this platform. +uint32_t GetCpuInfo(); + +} // namespace libgav1 + +#endif // LIBGAV1_SRC_UTILS_CPU_H_ |