media/libyuv/include/libyuv/cpu_id.h
author Andrea Marchesini <amarchesini@mozilla.com>
Thu, 04 Jun 2015 19:51:57 +0100
changeset 247941 fc4444e384ba699a67da8c1b1c286b7fdba3d919
parent 166823 f9315e1a38447e5f62ed9ff64470397252fcbc1f
child 304758 92c15211f59b03279452759986e8b896a2a1a42f
permissions -rw-r--r--
Bug 1155153 - about:serviceworkers should work in e10s mode, r=nsm, r=bholley

/*
 *  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

// TODO(fbarchard): Consider overlapping bits for different architectures.
// Internal flag to indicate cpuid requires initialization.
#define kCpuInit 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;
// 0x2000, 0x4000, 0x8000 reserved for future X86 flags.

// These flags are only valid on MIPS processors.
static const int kCpuHasMIPS = 0x10000;
static const int kCpuHasMIPS_DSP = 0x20000;
static const int kCpuHasMIPS_DSPR2 = 0x40000;

// 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_ == kCpuInit ? 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(0) 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