2 * Copyright 2011 The LibYuv Project Authors. All rights reserved.
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.
11 #ifndef INCLUDE_LIBYUV_CPU_ID_H_ // NOLINT
12 #define INCLUDE_LIBYUV_CPU_ID_H_
14 #include "libyuv/basic_types.h"
21 // TODO(fbarchard): Consider overlapping bits for different architectures.
22 // Internal flag to indicate cpuid requires initialization.
25 // These flags are only valid on ARM processors.
26 static const int kCpuHasARM = 0x2;
27 static const int kCpuHasNEON = 0x4;
28 // 0x8 reserved for future ARM flag.
30 // These flags are only valid on x86 processors.
31 static const int kCpuHasX86 = 0x10;
32 static const int kCpuHasSSE2 = 0x20;
33 static const int kCpuHasSSSE3 = 0x40;
34 static const int kCpuHasSSE41 = 0x80;
35 static const int kCpuHasSSE42 = 0x100;
36 static const int kCpuHasAVX = 0x200;
37 static const int kCpuHasAVX2 = 0x400;
38 static const int kCpuHasERMS = 0x800;
39 static const int kCpuHasFMA3 = 0x1000;
40 // 0x2000, 0x4000, 0x8000 reserved for future X86 flags.
42 // These flags are only valid on MIPS processors.
43 static const int kCpuHasMIPS = 0x10000;
44 static const int kCpuHasMIPS_DSP = 0x20000;
45 static const int kCpuHasMIPS_DSPR2 = 0x40000;
47 // Internal function used to auto-init.
49 int InitCpuFlags(void);
51 // Internal function for parsing /proc/cpuinfo.
53 int ArmCpuCaps(const char* cpuinfo_name);
55 // Detect CPU has SSE2 etc.
56 // Test_flag parameter should be one of kCpuHas constants above.
57 // returns non-zero if instruction set is detected
58 static __inline int TestCpuFlag(int test_flag) {
59 LIBYUV_API extern int cpu_info_;
60 return (cpu_info_ == kCpuInit ? InitCpuFlags() : cpu_info_) & test_flag;
63 // For testing, allow CPU flags to be disabled.
64 // ie MaskCpuFlags(~kCpuHasSSSE3) to disable SSSE3.
65 // MaskCpuFlags(-1) to enable all cpu specific optimizations.
66 // MaskCpuFlags(0) to disable all cpu specific optimizations.
68 void MaskCpuFlags(int enable_flags);
70 // Low level cpuid for X86. Returns zeros on other CPUs.
71 // eax is the info type that you want.
72 // ecx is typically the cpu number, and should normally be zero.
74 void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info);
81 #endif // INCLUDE_LIBYUV_CPU_ID_H_ NOLINT