mirror of
https://chromium.googlesource.com/libyuv/libyuv
synced 2025-12-07 01:06:46 +08:00
a1280730c2
BUG=none TEST=Talk builds on all platforms against libyuv. Review URL: http://webrtc-codereview.appspot.com/226003 git-svn-id: http://libyuv.googlecode.com/svn/trunk@31 16f28f9a-4ce2-e073-06de-1de4eb20be90
75 lines
2.0 KiB
C++
75 lines
2.0 KiB
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 "libyuv/cpu_id.h"
|
|
#include "libyuv/basic_types.h" // for CPU_X86
|
|
|
|
#ifdef _MSC_VER
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
// 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
|
|
|
|
namespace libyuv {
|
|
|
|
// CPU detect function for SIMD instruction sets.
|
|
static bool cpu_info_initialized_ = false;
|
|
static int cpu_info_ = 0;
|
|
|
|
// Global lock for cpu initialization.
|
|
static void InitCpuFlags() {
|
|
#ifdef CPU_X86
|
|
int cpu_info[4];
|
|
__cpuid(cpu_info, 1);
|
|
cpu_info_ = (cpu_info[2] & 0x00000200 ? kCpuHasSSSE3 : 0) |
|
|
(cpu_info[3] & 0x04000000 ? kCpuHasSSE2 : 0);
|
|
#elif defined(__ARM_NEON__)
|
|
// gcc -mfpu=neon defines __ARM_NEON__
|
|
// if code is specifically built for Neon-only, enable the flag.
|
|
cpu_info_ |= kCpuHasNEON;
|
|
#else
|
|
cpu_info_ = 0;
|
|
#endif
|
|
cpu_info_initialized_ = true;
|
|
}
|
|
|
|
void MaskCpuFlagsForTest(int enable_flags) {
|
|
InitCpuFlags();
|
|
cpu_info_ &= enable_flags;
|
|
}
|
|
|
|
bool TestCpuFlag(int flag) {
|
|
if (!cpu_info_initialized_) {
|
|
InitCpuFlags();
|
|
}
|
|
return cpu_info_ & flag ? true : false;
|
|
}
|
|
|
|
} // namespace libyuv
|