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Diffstat (limited to 'third_party/yuv/include/libyuv/cpu_id.h')
-rw-r--r-- | third_party/yuv/include/libyuv/cpu_id.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/third_party/yuv/include/libyuv/cpu_id.h b/third_party/yuv/include/libyuv/cpu_id.h new file mode 100644 index 00000000..dfb7445e --- /dev/null +++ b/third_party/yuv/include/libyuv/cpu_id.h @@ -0,0 +1,80 @@ +/* + * Copyright 2011 The LibYuv Project Authors. All rights reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef INCLUDE_LIBYUV_CPU_ID_H_ // NOLINT +#define INCLUDE_LIBYUV_CPU_ID_H_ + +#include "libyuv/basic_types.h" + +#ifdef __cplusplus +namespace libyuv { +extern "C" { +#endif + +// Internal flag to indicate cpuid requires initialization. +static const int kCpuInitialized = 0x1; + +// These flags are only valid on ARM processors. +static const int kCpuHasARM = 0x2; +static const int kCpuHasNEON = 0x4; +// 0x8 reserved for future ARM flag. + +// These flags are only valid on x86 processors. +static const int kCpuHasX86 = 0x10; +static const int kCpuHasSSE2 = 0x20; +static const int kCpuHasSSSE3 = 0x40; +static const int kCpuHasSSE41 = 0x80; +static const int kCpuHasSSE42 = 0x100; +static const int kCpuHasAVX = 0x200; +static const int kCpuHasAVX2 = 0x400; +static const int kCpuHasERMS = 0x800; +static const int kCpuHasFMA3 = 0x1000; +static const int kCpuHasAVX3 = 0x2000; +// 0x2000, 0x4000, 0x8000 reserved for future X86 flags. + +// These flags are only valid on MIPS processors. +static const int kCpuHasMIPS = 0x10000; +static const int kCpuHasDSPR2 = 0x20000; + +// Internal function used to auto-init. +LIBYUV_API +int InitCpuFlags(void); + +// Internal function for parsing /proc/cpuinfo. +LIBYUV_API +int ArmCpuCaps(const char* cpuinfo_name); + +// Detect CPU has SSE2 etc. +// Test_flag parameter should be one of kCpuHas constants above. +// returns non-zero if instruction set is detected +static __inline int TestCpuFlag(int test_flag) { + LIBYUV_API extern int cpu_info_; + return (!cpu_info_ ? InitCpuFlags() : cpu_info_) & test_flag; +} + +// For testing, allow CPU flags to be disabled. +// ie MaskCpuFlags(~kCpuHasSSSE3) to disable SSSE3. +// MaskCpuFlags(-1) to enable all cpu specific optimizations. +// MaskCpuFlags(1) to disable all cpu specific optimizations. +LIBYUV_API +void MaskCpuFlags(int enable_flags); + +// Low level cpuid for X86. Returns zeros on other CPUs. +// eax is the info type that you want. +// ecx is typically the cpu number, and should normally be zero. +LIBYUV_API +void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info); + +#ifdef __cplusplus +} // extern "C" +} // namespace libyuv +#endif + +#endif // INCLUDE_LIBYUV_CPU_ID_H_ NOLINT |