libvpx: Pull from upstream

source/libvpx/third_party/libyuv/source/cpu_id.c

-/*
- *  Copyright (c) 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.
- */
-
-#include "third_party/libyuv/include/libyuv/cpu_id.h"
-
-#ifdef _MSC_VER
-#include <intrin.h>
-#endif
-#ifdef __ANDROID__
-#include <cpu-features.h>
-#endif
-
-#include "third_party/libyuv/include/libyuv/basic_types.h"  // for CPU_X86
-
-// TODO(fbarchard): Use cpuid.h when gcc 4.4 is used on OSX and Linux.
-#if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
-static inline void __cpuid(int cpu_info[4], int info_type) {
-  asm volatile (
-    "mov %%ebx, %%edi                          \n"
-    "cpuid                                     \n"
-    "xchg %%edi, %%ebx                         \n"
-    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
-    : "a"(info_type)
-  );
-}
-#elif defined(__i386__) || defined(__x86_64__)
-static inline void __cpuid(int cpu_info[4], int info_type) {
-  asm volatile (
-    "cpuid                                     \n"
-    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
-    : "a"(info_type)
-  );
-}
-#endif
-
-#ifdef __cplusplus
-namespace libyuv {
-extern "C" {
-#endif
-
-// CPU detect function for SIMD instruction sets.
-int cpu_info_ = 0;
-
-int InitCpuFlags() {
-#ifdef CPU_X86
-  int cpu_info[4];
-  __cpuid(cpu_info, 1);
-  cpu_info_ = (cpu_info[3] & 0x04000000 ? kCpuHasSSE2 : 0) |
-              (cpu_info[2] & 0x00000200 ? kCpuHasSSSE3 : 0) |
-              kCpuInitialized;
-#elif defined(__ANDROID__) && defined(__ARM_NEON__)
-  uint64_t features = android_getCpuFeatures();
-  cpu_info_ = ((features & ANDROID_CPU_ARM_FEATURE_NEON) ? kCpuHasNEON : 0) |
-              kCpuInitialized;
-#elif defined(__ARM_NEON__)
-  // gcc -mfpu=neon defines __ARM_NEON__
-  // Enable Neon if you want support for Neon and Arm, and use MaskCpuFlags
-  // to disable Neon on devices that do not have it.
-  cpu_info_ = kCpuHasNEON | kCpuInitialized;
-#else
-  cpu_info_ = kCpuInitialized;
-#endif
-  return cpu_info_;
-}
-
-void MaskCpuFlags(int enable_flags) {
-  InitCpuFlags();
-  cpu_info_ = (cpu_info_ & enable_flags) | kCpuInitialized;
-}
-
-#ifdef __cplusplus
-}  // extern "C"
-}  // namespace libyuv
-#endif