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Diffstat (limited to 'media/libyuv/libyuv/include/libyuv/cpu_id.h')
-rw-r--r-- | media/libyuv/libyuv/include/libyuv/cpu_id.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/media/libyuv/libyuv/include/libyuv/cpu_id.h b/media/libyuv/libyuv/include/libyuv/cpu_id.h new file mode 100644 index 0000000000..fb90c6c737 --- /dev/null +++ b/media/libyuv/libyuv/include/libyuv/cpu_id.h @@ -0,0 +1,127 @@ +/* + * 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_ +#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; // unused at this time. +static const int kCpuHasAVX = 0x200; +static const int kCpuHasAVX2 = 0x400; +static const int kCpuHasERMS = 0x800; +static const int kCpuHasFMA3 = 0x1000; +static const int kCpuHasF16C = 0x2000; +static const int kCpuHasGFNI = 0x4000; +static const int kCpuHasAVX512BW = 0x8000; +static const int kCpuHasAVX512VL = 0x10000; +static const int kCpuHasAVX512VNNI = 0x20000; +static const int kCpuHasAVX512VBMI = 0x40000; +static const int kCpuHasAVX512VBMI2 = 0x80000; +static const int kCpuHasAVX512VBITALG = 0x100000; +static const int kCpuHasAVX512VPOPCNTDQ = 0x200000; + +// These flags are only valid on MIPS processors. +static const int kCpuHasMIPS = 0x400000; +static const int kCpuHasMSA = 0x800000; + +// These flags are only valid on LOONGARCH processors. +static const int kCpuHasLOONGARCH = 0x2000000; +static const int kCpuHasLSX = 0x4000000; +static const int kCpuHasLASX = 0x8000000; + +// Optional init function. TestCpuFlag does an auto-init. +// Returns cpu_info flags. +LIBYUV_API +int InitCpuFlags(void); + +// 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_; +#ifdef __ATOMIC_RELAXED + int cpu_info = __atomic_load_n(&cpu_info_, __ATOMIC_RELAXED); +#else + int cpu_info = cpu_info_; +#endif + return (!cpu_info ? InitCpuFlags() : cpu_info) & test_flag; +} + +// Internal function for parsing /proc/cpuinfo. +LIBYUV_API +int ArmCpuCaps(const char* cpuinfo_name); +LIBYUV_API +int MipsCpuCaps(const char* cpuinfo_name); + +// 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. +// MaskCpuFlags(0) to reset state so next call will auto init. +// Returns cpu_info flags. +LIBYUV_API +int MaskCpuFlags(int enable_flags); + +// Sets the CPU flags to |cpu_flags|, bypassing the detection code. |cpu_flags| +// should be a valid combination of the kCpuHas constants above and include +// kCpuInitialized. Use this method when running in a sandboxed process where +// the detection code might fail (as it might access /proc/cpuinfo). In such +// cases the cpu_info can be obtained from a non sandboxed process by calling +// InitCpuFlags() and passed to the sandboxed process (via command line +// parameters, IPC...) which can then call this method to initialize the CPU +// flags. +// Notes: +// - when specifying 0 for |cpu_flags|, the auto initialization is enabled +// again. +// - enabling CPU features that are not supported by the CPU will result in +// undefined behavior. +// TODO(fbarchard): consider writing a helper function that translates from +// other library CPU info to libyuv CPU info and add a .md doc that explains +// CPU detection. +static __inline void SetCpuFlags(int cpu_flags) { + LIBYUV_API extern int cpu_info_; +#ifdef __ATOMIC_RELAXED + __atomic_store_n(&cpu_info_, cpu_flags, __ATOMIC_RELAXED); +#else + cpu_info_ = cpu_flags; +#endif +} + +// 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(int info_eax, int info_ecx, int* cpu_info); + +#ifdef __cplusplus +} // extern "C" +} // namespace libyuv +#endif + +#endif // INCLUDE_LIBYUV_CPU_ID_H_ |