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 17 namespace libyuv { 18 extern "C" { 19 #endif 20 21 // Internal flag to indicate cpuid is initialized. 22 static const int kCpuInitialized = 0x1; 23 24 // These flags are only valid on ARM processors. 25 static const int kCpuHasARM = 0x2; 26 static const int kCpuHasNEON = 0x4; 27 // 0x8 reserved for future ARM flag. 28 29 // These flags are only valid on x86 processors. 30 static const int kCpuHasX86 = 0x10; 31 static const int kCpuHasSSE2 = 0x20; 32 static const int kCpuHasSSSE3 = 0x40; 33 static const int kCpuHasSSE41 = 0x80; 34 static const int kCpuHasSSE42 = 0x100; 35 static const int kCpuHasAVX = 0x200; 36 static const int kCpuHasAVX2 = 0x400; 37 38 // Internal function used to auto-init. 39 LIBYUV_API 40 int InitCpuFlags(void); 41 42 // Internal function for parsing /proc/cpuinfo. 43 LIBYUV_API 44 int 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 49 static __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. 58 LIBYUV_API 59 void MaskCpuFlags(int enable_flags); 60 61 // Low level cpuid for X86. Returns zeros on other CPUs. 62 LIBYUV_API 63 void 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
