1/* 2 * Copyright 2011 The LibYuv Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#ifndef INCLUDE_LIBYUV_CPU_ID_H_ // NOLINT 12#define INCLUDE_LIBYUV_CPU_ID_H_ 13 14#include "libyuv/basic_types.h" 15 16#ifdef __cplusplus 17namespace libyuv { 18extern "C" { 19#endif 20 21// Internal flag to indicate cpuid is initialized. 22static const int kCpuInitialized = 0x1; 23 24// These flags are only valid on ARM processors. 25static const int kCpuHasARM = 0x2; 26static const int kCpuHasNEON = 0x4; 27// 0x8 reserved for future ARM flag. 28 29// These flags are only valid on x86 processors. 30static const int kCpuHasX86 = 0x10; 31static const int kCpuHasSSE2 = 0x20; 32static const int kCpuHasSSSE3 = 0x40; 33static const int kCpuHasSSE41 = 0x80; 34static const int kCpuHasSSE42 = 0x100; 35static const int kCpuHasAVX = 0x200; 36static const int kCpuHasAVX2 = 0x400; 37 38// Internal function used to auto-init. 39LIBYUV_API 40int InitCpuFlags(void); 41 42// Internal function for parsing /proc/cpuinfo. 43LIBYUV_API 44int ArmCpuCaps(const char* cpuinfo_name); 45 46// Detect CPU has SSE2 etc. 47// Test_flag parameter should be one of kCpuHas constants above. 48// returns non-zero if instruction set is detected 49static __inline int TestCpuFlag(int test_flag) { 50 LIBYUV_API extern int cpu_info_; 51 return (cpu_info_ ? cpu_info_ : InitCpuFlags()) & test_flag; 52} 53 54// For testing, allow CPU flags to be disabled. 55// ie MaskCpuFlags(~kCpuHasSSSE3) to disable SSSE3. 56// MaskCpuFlags(-1) to enable all cpu specific optimizations. 57// MaskCpuFlags(0) to disable all cpu specific optimizations. 58LIBYUV_API 59void MaskCpuFlags(int enable_flags); 60 61// Low level cpuid for X86. Returns zeros on other CPUs. 62LIBYUV_API 63void CpuId(int cpu_info[4], int info_type); 64 65#ifdef __cplusplus 66} // extern "C" 67} // namespace libyuv 68#endif 69 70#endif // INCLUDE_LIBYUV_CPU_ID_H_ NOLINT 71