mirror of
https://chromium.googlesource.com/libyuv/libyuv
synced 2025-12-06 16:56:55 +08:00
aed1cc94c1
git-svn-id: http://libyuv.googlecode.com/svn/trunk@2 16f28f9a-4ce2-e073-06de-1de4eb20be90
117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
/*
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* Copyright (c) 2011 The LibYuv project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "cpu_id.h"
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#ifdef _MSC_VER
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#include <intrin.h>
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#elif LINUX
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#include "linux.h"
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#endif
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// TODO(fbarchard): Use cpuid.h when gcc 4.4 is used on OSX and Linux.
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#if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
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static inline void __cpuid(int cpu_info[4], int info_type) {
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__asm__ volatile (
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"mov %%ebx, %%edi\n"
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"cpuid\n"
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"xchg %%edi, %%ebx\n"
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: "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
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: "a"(info_type)
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);
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}
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#elif defined(__i386__) || defined(__x86_64__)
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static inline void __cpuid(int cpu_info[4], int info_type) {
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__asm__ volatile (
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"cpuid\n"
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: "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
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: "a"(info_type)
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);
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}
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#endif
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namespace libyuv {
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// CPU detect function for SIMD instruction sets.
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bool CpuInfo::cpu_info_initialized_ = false;
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int CpuInfo::cpu_info_ = 0;
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// Global lock for cpu initialization.
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#ifdef CPU_X86
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void cpuid(int cpu_info[4], int info_type) {
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__cpuid(cpu_info, info_type);
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}
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#endif
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void CpuInfo::InitCpuFlags() {
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#ifdef CPU_X86
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int cpu_info[4];
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__cpuid(cpu_info, 1);
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cpu_info_ = (cpu_info[2] & 0x00000200 ? kCpuHasSSSE3 : 0) |
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(cpu_info[3] & 0x04000000 ? kCpuHasSSE2 : 0);
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#elif defined(__ARM_NEON__)
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// gcc -mfpu=neon defines __ARM_NEON__
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// if code is specifically built for Neon-only, enable the flag.
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cpu_info_ |= kCpuHasNEON;
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#elif LINUX && defined(__arm__)
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cpu_info_ = 0;
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// Look for NEON support in /proc/cpuinfo
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ProcCpuInfo proc_info;
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size_t section_count;
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if (proc_info.LoadFromSystem() &&
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proc_info.GetSectionCount(§ion_count)) {
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for (size_t i = 0; i < section_count; ++i) {
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std::string out_features;
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if (proc_info.GetSectionStringValue(i, "Features", &out_features)) {
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if (out_features.find("neon") != std::string::npos) {
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cpu_info_ |= kCpuHasNEON;
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}
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break;
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}
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}
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}
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#else
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cpu_info_ = 0;
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#endif
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cpu_info_initialized_ = true;
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}
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void CpuInfo::MaskCpuFlagsForTest(int enable_flags) {
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InitCpuFlags();
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cpu_info_ &= enable_flags;
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}
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bool CpuInfo::TestCpuFlag(int flag) {
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if (!cpu_info_initialized_) {
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InitCpuFlags();
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}
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return cpu_info_ & flag ? true : false;
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}
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// Returns the vendor string from the cpu, e.g. "GenuineIntel", "AuthenticAMD".
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// See "Intel Processor Identification and the CPUID Instruction"
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// (Intel document number: 241618)
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std::string CpuInfo::GetCpuVendor() {
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#ifdef CPU_X86
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int cpu_info[4];
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cpuid(cpu_info, 0);
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cpu_info[0] = cpu_info[1]; // Reorder output
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cpu_info[1] = cpu_info[3];
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cpu_info[2] = cpu_info[2];
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cpu_info[3] = 0;
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return std::string(reinterpret_cast<char *>(&cpu_info[0]));
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#else
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return std::string("Undefined");
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#endif
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}
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} // namespace libyuv
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