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https://chromium.googlesource.com/libyuv/libyuv
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2fc56673c1
BUG=none TEST=none Review URL: https://webrtc-codereview.appspot.com/366007 git-svn-id: http://libyuv.googlecode.com/svn/trunk@158 16f28f9a-4ce2-e073-06de-1de4eb20be90
112 lines
3.1 KiB
C++
112 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 "libyuv/cpu_id.h"
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#include <stdlib.h> // For getenv()
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#ifdef _MSC_VER
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#include <intrin.h> // For __cpuid()
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#endif
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// For ArmCpuCaps() but unittested on all platforms
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#include <stdio.h>
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#include <string.h>
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#include "libyuv/basic_types.h" // For CPU_X86
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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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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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// based on libvpx arm_cpudetect.c
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// For Arm, but testable on any CPU
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int ArmCpuCaps(const char* cpuinfoname) {
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int flags = 0;
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FILE* fin = fopen(cpuinfoname, "r");
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if (fin) {
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char buf[512];
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while (fgets(buf, 511, fin)) {
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if (memcmp(buf, "Features", 8) == 0) {
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char* p = strstr(buf, " neon");
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if (p && (p[5] == ' ' || p[5] == '\n')) {
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flags |= kCpuHasNEON;
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break;
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}
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}
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}
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fclose(fin);
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}
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return flags;
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}
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// CPU detect function for SIMD instruction sets.
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int cpu_info_ = 0;
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int 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[3] & 0x04000000 ? kCpuHasSSE2 : 0) |
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(cpu_info[2] & 0x00000200 ? kCpuHasSSSE3 : 0) |
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kCpuInitialized;
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// environment variable overrides for testing.
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if (getenv("LIBYUV_DISABLE_SSE2")) {
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cpu_info_ &= ~kCpuHasSSE2;
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}
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// environment variable overrides for testing.
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if (getenv("LIBYUV_DISABLE_SSSE3")) {
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cpu_info_ &= ~kCpuHasSSSE3;
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}
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#elif defined(__linux__) && defined(__ARM_NEON__)
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cpu_info_ = ArmCpuCaps("/proc/cpuinfo") | kCpuInitialized;
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#elif defined(__ARM_NEON__)
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// gcc -mfpu=neon defines __ARM_NEON__
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// Enable Neon if you want support for Neon and Arm, and use MaskCpuFlags
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// to disable Neon on devices that do not have it.
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cpu_info_ = kCpuHasNEON | kCpuInitialized;
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#else
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cpu_info_ = kCpuInitialized;
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#endif
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return cpu_info_;
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}
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void MaskCpuFlags(int enable_flags) {
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InitCpuFlags();
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cpu_info_ = (cpu_info_ & enable_flags) | kCpuInitialized;
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}
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#ifdef __cplusplus
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} // extern "C"
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} // namespace libyuv
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#endif
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