294 lines
8.5 KiB
C++
294 lines
8.5 KiB
C++
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include "libyuv/cpu_id.h"
|
|
|
|
#if defined(_MSC_VER) && !defined(__clang__)
|
|
#include <intrin.h> // For __cpuidex()
|
|
#endif
|
|
#if !defined(__pnacl__) && !defined(__CLR_VER) && \
|
|
!defined(__native_client__) && \
|
|
defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
|
|
#include <immintrin.h> // For _xgetbv()
|
|
#endif
|
|
|
|
#if !defined(__native_client__)
|
|
#include <stdlib.h> // For getenv()
|
|
#endif
|
|
|
|
// For ArmCpuCaps() but unittested on all platforms
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "libyuv/basic_types.h" // For CPU_X86
|
|
|
|
#ifdef __cplusplus
|
|
namespace libyuv {
|
|
extern "C" {
|
|
#endif
|
|
|
|
// For functions that use the stack and have runtime checks for overflow,
|
|
// use SAFEBUFFERS to avoid additional check.
|
|
#if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
|
|
#define SAFEBUFFERS __declspec(safebuffers)
|
|
#else
|
|
#define SAFEBUFFERS
|
|
#endif
|
|
|
|
// Low level cpuid for X86. Returns zeros on other CPUs.
|
|
#if !defined(__pnacl__) && !defined(__CLR_VER) && \
|
|
(defined(_M_IX86) || defined(_M_X64) || \
|
|
defined(__i386__) || defined(__x86_64__))
|
|
LIBYUV_API
|
|
void CpuId(uint32 info_eax, uint32 info_ecx, uint32* cpu_info) {
|
|
#if defined(_MSC_VER) && !defined(__clang__)
|
|
#if (_MSC_FULL_VER >= 160040219)
|
|
__cpuidex((int*)(cpu_info), info_eax, info_ecx);
|
|
#elif defined(_M_IX86)
|
|
__asm {
|
|
mov eax, info_eax
|
|
mov ecx, info_ecx
|
|
mov edi, cpu_info
|
|
cpuid
|
|
mov [edi], eax
|
|
mov [edi + 4], ebx
|
|
mov [edi + 8], ecx
|
|
mov [edi + 12], edx
|
|
}
|
|
#else
|
|
if (info_ecx == 0) {
|
|
__cpuid((int*)(cpu_info), info_eax);
|
|
} else {
|
|
cpu_info[3] = cpu_info[2] = cpu_info[1] = cpu_info[0] = 0;
|
|
}
|
|
#endif
|
|
#else // defined(_MSC_VER)
|
|
uint32 info_ebx, info_edx;
|
|
asm volatile ( // NOLINT
|
|
#if defined( __i386__) && defined(__PIC__)
|
|
// Preserve ebx for fpic 32 bit.
|
|
"mov %%ebx, %%edi \n"
|
|
"cpuid \n"
|
|
"xchg %%edi, %%ebx \n"
|
|
: "=D" (info_ebx),
|
|
#else
|
|
"cpuid \n"
|
|
: "=b" (info_ebx),
|
|
#endif // defined( __i386__) && defined(__PIC__)
|
|
"+a" (info_eax), "+c" (info_ecx), "=d" (info_edx));
|
|
cpu_info[0] = info_eax;
|
|
cpu_info[1] = info_ebx;
|
|
cpu_info[2] = info_ecx;
|
|
cpu_info[3] = info_edx;
|
|
#endif // defined(_MSC_VER)
|
|
}
|
|
|
|
#if !defined(__native_client__)
|
|
#define HAS_XGETBV
|
|
// X86 CPUs have xgetbv to detect OS saves high parts of ymm registers.
|
|
int TestOsSaveYmm() {
|
|
uint32 xcr0 = 0u;
|
|
#if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
|
|
xcr0 = (uint32)(_xgetbv(0)); // VS2010 SP1 required.
|
|
#elif defined(_M_IX86) && defined(_MSC_VER)
|
|
__asm {
|
|
xor ecx, ecx // xcr 0
|
|
_asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0 // For VS2010 and earlier.
|
|
mov xcr0, eax
|
|
}
|
|
#elif defined(__i386__) || defined(__x86_64__)
|
|
asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcr0) : "c" (0) : "%edx");
|
|
#endif // defined(_MSC_VER)
|
|
return((xcr0 & 6) == 6); // Is ymm saved?
|
|
}
|
|
#endif // !defined(__native_client__)
|
|
#else
|
|
LIBYUV_API
|
|
void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info) {
|
|
cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0;
|
|
}
|
|
#endif
|
|
|
|
// based on libvpx arm_cpudetect.c
|
|
// For Arm, but public to allow testing on any CPU
|
|
LIBYUV_API SAFEBUFFERS
|
|
int ArmCpuCaps(const char* cpuinfo_name) {
|
|
char cpuinfo_line[512];
|
|
FILE* f = fopen(cpuinfo_name, "r");
|
|
if (!f) {
|
|
// Assume Neon if /proc/cpuinfo is unavailable.
|
|
// This will occur for Chrome sandbox for Pepper or Render process.
|
|
return kCpuHasNEON;
|
|
}
|
|
while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
|
|
if (memcmp(cpuinfo_line, "Features", 8) == 0) {
|
|
char* p = strstr(cpuinfo_line, " neon");
|
|
if (p && (p[5] == ' ' || p[5] == '\n')) {
|
|
fclose(f);
|
|
return kCpuHasNEON;
|
|
}
|
|
}
|
|
}
|
|
fclose(f);
|
|
return 0;
|
|
}
|
|
|
|
#if defined(__mips__) && defined(__linux__)
|
|
static int MipsCpuCaps(const char* search_string) {
|
|
char cpuinfo_line[512];
|
|
const char* file_name = "/proc/cpuinfo";
|
|
FILE* f = fopen(file_name, "r");
|
|
if (!f) {
|
|
// Assume DSP if /proc/cpuinfo is unavailable.
|
|
// This will occur for Chrome sandbox for Pepper or Render process.
|
|
return kCpuHasMIPS_DSP;
|
|
}
|
|
while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f) != NULL) {
|
|
if (strstr(cpuinfo_line, search_string) != NULL) {
|
|
fclose(f);
|
|
return kCpuHasMIPS_DSP;
|
|
}
|
|
}
|
|
fclose(f);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// CPU detect function for SIMD instruction sets.
|
|
LIBYUV_API
|
|
int cpu_info_ = kCpuInit; // cpu_info is not initialized yet.
|
|
|
|
// Test environment variable for disabling CPU features. Any non-zero value
|
|
// to disable. Zero ignored to make it easy to set the variable on/off.
|
|
#if !defined(__native_client__) && !defined(_M_ARM)
|
|
|
|
static LIBYUV_BOOL TestEnv(const char* name) {
|
|
const char* var = getenv(name);
|
|
if (var) {
|
|
if (var[0] != '0') {
|
|
return LIBYUV_TRUE;
|
|
}
|
|
}
|
|
return LIBYUV_FALSE;
|
|
}
|
|
#else // nacl does not support getenv().
|
|
static LIBYUV_BOOL TestEnv(const char*) {
|
|
return LIBYUV_FALSE;
|
|
}
|
|
#endif
|
|
|
|
LIBYUV_API SAFEBUFFERS
|
|
int InitCpuFlags(void) {
|
|
#if !defined(__pnacl__) && !defined(__CLR_VER) && defined(CPU_X86)
|
|
|
|
uint32 cpu_info0[4] = { 0, 0, 0, 0 };
|
|
uint32 cpu_info1[4] = { 0, 0, 0, 0 };
|
|
uint32 cpu_info7[4] = { 0, 0, 0, 0 };
|
|
CpuId(0, 0, cpu_info0);
|
|
CpuId(1, 0, cpu_info1);
|
|
if (cpu_info0[0] >= 7) {
|
|
CpuId(7, 0, cpu_info7);
|
|
}
|
|
cpu_info_ = ((cpu_info1[3] & 0x04000000) ? kCpuHasSSE2 : 0) |
|
|
((cpu_info1[2] & 0x00000200) ? kCpuHasSSSE3 : 0) |
|
|
((cpu_info1[2] & 0x00080000) ? kCpuHasSSE41 : 0) |
|
|
((cpu_info1[2] & 0x00100000) ? kCpuHasSSE42 : 0) |
|
|
((cpu_info7[1] & 0x00000200) ? kCpuHasERMS : 0) |
|
|
((cpu_info1[2] & 0x00001000) ? kCpuHasFMA3 : 0) |
|
|
kCpuHasX86;
|
|
|
|
#ifdef HAS_XGETBV
|
|
if ((cpu_info1[2] & 0x18000000) == 0x18000000 && // AVX and OSSave
|
|
TestOsSaveYmm()) { // Saves YMM.
|
|
cpu_info_ |= ((cpu_info7[1] & 0x00000020) ? kCpuHasAVX2 : 0) |
|
|
kCpuHasAVX;
|
|
}
|
|
#endif
|
|
// Environment variable overrides for testing.
|
|
if (TestEnv("LIBYUV_DISABLE_X86")) {
|
|
cpu_info_ &= ~kCpuHasX86;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_SSE2")) {
|
|
cpu_info_ &= ~kCpuHasSSE2;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_SSSE3")) {
|
|
cpu_info_ &= ~kCpuHasSSSE3;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_SSE41")) {
|
|
cpu_info_ &= ~kCpuHasSSE41;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_SSE42")) {
|
|
cpu_info_ &= ~kCpuHasSSE42;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_AVX")) {
|
|
cpu_info_ &= ~kCpuHasAVX;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_AVX2")) {
|
|
cpu_info_ &= ~kCpuHasAVX2;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_ERMS")) {
|
|
cpu_info_ &= ~kCpuHasERMS;
|
|
}
|
|
if (TestEnv("LIBYUV_DISABLE_FMA3")) {
|
|
cpu_info_ &= ~kCpuHasFMA3;
|
|
}
|
|
#elif defined(__mips__) && defined(__linux__)
|
|
// Linux mips parse text file for dsp detect.
|
|
cpu_info_ = MipsCpuCaps("dsp"); // set kCpuHasMIPS_DSP.
|
|
#if defined(__mips_dspr2)
|
|
cpu_info_ |= kCpuHasMIPS_DSPR2;
|
|
#endif
|
|
cpu_info_ |= kCpuHasMIPS;
|
|
|
|
if (getenv("LIBYUV_DISABLE_MIPS")) {
|
|
cpu_info_ &= ~kCpuHasMIPS;
|
|
}
|
|
if (getenv("LIBYUV_DISABLE_MIPS_DSP")) {
|
|
cpu_info_ &= ~kCpuHasMIPS_DSP;
|
|
}
|
|
if (getenv("LIBYUV_DISABLE_MIPS_DSPR2")) {
|
|
cpu_info_ &= ~kCpuHasMIPS_DSPR2;
|
|
}
|
|
#elif defined(__arm__) || defined(__aarch64__)
|
|
// gcc -mfpu=neon defines __ARM_NEON__
|
|
// __ARM_NEON__ generates code that requires Neon. NaCL also requires Neon.
|
|
// For Linux, /proc/cpuinfo can be tested but without that assume Neon.
|
|
#if defined(__ARM_NEON__) || defined(__native_client__) || !defined(__linux__)
|
|
cpu_info_ = kCpuHasNEON;
|
|
// For aarch64(arm64), /proc/cpuinfo's feature is not complete, e.g. no neon
|
|
// flag in it.
|
|
// So for aarch64, neon enabling is hard coded here.
|
|
#elif defined(__aarch64__)
|
|
cpu_info_ = kCpuHasNEON;
|
|
#else
|
|
// Linux arm parse text file for neon detect.
|
|
cpu_info_ = ArmCpuCaps("/proc/cpuinfo");
|
|
#endif
|
|
cpu_info_ |= kCpuHasARM;
|
|
if (TestEnv("LIBYUV_DISABLE_NEON")) {
|
|
cpu_info_ &= ~kCpuHasNEON;
|
|
}
|
|
#endif // __arm__
|
|
if (TestEnv("LIBYUV_DISABLE_ASM")) {
|
|
cpu_info_ = 0;
|
|
}
|
|
return cpu_info_;
|
|
}
|
|
|
|
LIBYUV_API
|
|
void MaskCpuFlags(int enable_flags) {
|
|
cpu_info_ = InitCpuFlags() & enable_flags;
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
} // namespace libyuv
|
|
#endif
|