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280 lines
8.0 KiB
C++
280 lines
8.0 KiB
C++
/*
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* Copyright 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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#ifdef _MSC_VER
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#include <intrin.h> // For __cpuidex()
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#endif
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#if !defined(__pnacl__) && !defined(__CLR_VER) && \
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!defined(__native_client__) && defined(_M_X64) && \
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defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
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#include <immintrin.h> // For _xgetbv()
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#endif
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#if !defined(__native_client__)
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#include <stdlib.h> // For getenv()
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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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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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// For functions that use the stack and have runtime checks for overflow,
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// use SAFEBUFFERS to avoid additional check.
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#if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
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#define SAFEBUFFERS __declspec(safebuffers)
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#else
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#define SAFEBUFFERS
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#endif
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// Low level cpuid for X86. Returns zeros on other CPUs.
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#if !defined(__pnacl__) && !defined(__CLR_VER) && \
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(defined(_M_IX86) || defined(_M_X64) || \
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defined(__i386__) || defined(__x86_64__))
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LIBYUV_API
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void CpuId(uint32 info_eax, uint32 info_ecx, uint32* cpu_info) {
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#if defined(_MSC_VER)
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#if (_MSC_FULL_VER >= 160040219)
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__cpuidex((int*)(cpu_info), info_eax, info_ecx);
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#elif defined(_M_IX86)
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__asm {
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mov eax, info_eax
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mov ecx, info_ecx
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mov edi, cpu_info
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cpuid
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mov [edi], eax
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mov [edi + 4], ebx
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mov [edi + 8], ecx
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mov [edi + 12], edx
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}
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#else
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if (info_ecx == 0) {
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__cpuid((int*)(cpu_info), info_eax);
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} else {
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cpu_info[3] = cpu_info[2] = cpu_info[1] = cpu_info[0] = 0;
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}
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#endif
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#else // defined(_MSC_VER)
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uint32 info_ebx, info_edx;
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asm volatile ( // NOLINT
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#if defined( __i386__) && defined(__PIC__)
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// Preserve ebx for fpic 32 bit.
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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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: "=D" (info_ebx),
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#else
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"cpuid \n"
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: "=b" (info_ebx),
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#endif // defined( __i386__) && defined(__PIC__)
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"+a" (info_eax), "+c" (info_ecx), "=d" (info_edx));
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cpu_info[0] = info_eax;
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cpu_info[1] = info_ebx;
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cpu_info[2] = info_ecx;
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cpu_info[3] = info_edx;
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#endif // defined(_MSC_VER)
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}
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#if !defined(__native_client__)
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#define HAS_XGETBV
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// X86 CPUs have xgetbv to detect OS saves high parts of ymm registers.
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int TestOsSaveYmm() {
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uint32 xcr0 = 0u;
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#if defined(_MSC_VER) && defined(_XCR_XFEATURE_ENABLED_MASK)
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xcr0 = (uint32)(_xgetbv(_XCR_XFEATURE_ENABLED_MASK));
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#elif defined(_M_IX86)
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__asm {
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xor ecx, ecx // xcr 0
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_asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0 // For VS2010 and earlier.
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mov xcr0, eax
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}
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#elif defined(__i386__) || defined(__x86_64__)
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asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcr0) : "c" (0) : "%edx");
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#endif // defined(_MSC_VER)
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return((xcr0 & 6) == 6); // Is ymm saved?
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}
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#endif // !defined(__native_client__)
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#else
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LIBYUV_API
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void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info) {
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cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0;
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}
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#endif
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// based on libvpx arm_cpudetect.c
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// For Arm, but public to allow testing on any CPU
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LIBYUV_API SAFEBUFFERS
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int ArmCpuCaps(const char* cpuinfo_name) {
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FILE* f = fopen(cpuinfo_name, "r");
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if (f) {
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char cpuinfo_line[512];
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while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
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if (memcmp(cpuinfo_line, "Features", 8) == 0) {
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char* p = strstr(cpuinfo_line, " neon");
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if (p && (p[5] == ' ' || p[5] == '\n')) {
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fclose(f);
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return kCpuHasNEON;
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}
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}
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}
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fclose(f);
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}
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return 0;
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}
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#if defined(__mips__) && defined(__linux__)
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static int MipsCpuCaps(const char* search_string) {
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const char* file_name = "/proc/cpuinfo";
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char cpuinfo_line[256];
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FILE* f = NULL;
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if ((f = fopen(file_name, "r")) != NULL) {
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while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f) != NULL) {
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if (strstr(cpuinfo_line, search_string) != NULL) {
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fclose(f);
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return kCpuHasMIPS_DSP;
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}
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}
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fclose(f);
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}
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/* Did not find string in the proc file, or not Linux ELF. */
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return 0;
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}
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#endif
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// CPU detect function for SIMD instruction sets.
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LIBYUV_API
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int cpu_info_ = kCpuInit; // cpu_info is not initialized yet.
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// Test environment variable for disabling CPU features. Any non-zero value
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// to disable. Zero ignored to make it easy to set the variable on/off.
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#if !defined(__native_client__) && !defined(_M_ARM)
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static LIBYUV_BOOL TestEnv(const char* name) {
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const char* var = getenv(name);
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if (var) {
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if (var[0] != '0') {
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return LIBYUV_TRUE;
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}
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}
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return LIBYUV_FALSE;
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}
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#else // nacl does not support getenv().
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static LIBYUV_BOOL TestEnv(const char*) {
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return LIBYUV_FALSE;
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}
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#endif
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LIBYUV_API SAFEBUFFERS
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int InitCpuFlags(void) {
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#if !defined(__pnacl__) && !defined(__CLR_VER) && defined(CPU_X86)
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uint32 cpu_info1[4] = { 0, 0, 0, 0 };
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uint32 cpu_info7[4] = { 0, 0, 0, 0 };
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CpuId(1, 0, cpu_info1);
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CpuId(7, 0, cpu_info7);
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cpu_info_ = ((cpu_info1[3] & 0x04000000) ? kCpuHasSSE2 : 0) |
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((cpu_info1[2] & 0x00000200) ? kCpuHasSSSE3 : 0) |
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((cpu_info1[2] & 0x00080000) ? kCpuHasSSE41 : 0) |
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((cpu_info1[2] & 0x00100000) ? kCpuHasSSE42 : 0) |
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((cpu_info7[1] & 0x00000200) ? kCpuHasERMS : 0) |
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((cpu_info1[2] & 0x00001000) ? kCpuHasFMA3 : 0) |
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kCpuHasX86;
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#ifdef HAS_XGETBV
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if ((cpu_info1[2] & 0x18000000) == 0x18000000 && // AVX and OSSave
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TestOsSaveYmm()) { // Saves YMM.
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cpu_info_ |= ((cpu_info7[1] & 0x00000020) ? kCpuHasAVX2 : 0) |
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kCpuHasAVX;
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}
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#endif
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// Environment variable overrides for testing.
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if (TestEnv("LIBYUV_DISABLE_X86")) {
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cpu_info_ &= ~kCpuHasX86;
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}
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if (TestEnv("LIBYUV_DISABLE_SSE2")) {
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cpu_info_ &= ~kCpuHasSSE2;
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}
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if (TestEnv("LIBYUV_DISABLE_SSSE3")) {
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cpu_info_ &= ~kCpuHasSSSE3;
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}
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if (TestEnv("LIBYUV_DISABLE_SSE41")) {
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cpu_info_ &= ~kCpuHasSSE41;
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}
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if (TestEnv("LIBYUV_DISABLE_SSE42")) {
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cpu_info_ &= ~kCpuHasSSE42;
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}
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if (TestEnv("LIBYUV_DISABLE_AVX")) {
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cpu_info_ &= ~kCpuHasAVX;
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}
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if (TestEnv("LIBYUV_DISABLE_AVX2")) {
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cpu_info_ &= ~kCpuHasAVX2;
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}
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if (TestEnv("LIBYUV_DISABLE_ERMS")) {
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cpu_info_ &= ~kCpuHasERMS;
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}
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if (TestEnv("LIBYUV_DISABLE_FMA3")) {
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cpu_info_ &= ~kCpuHasFMA3;
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}
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#elif defined(__mips__) && defined(__linux__)
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// Linux mips parse text file for dsp detect.
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cpu_info_ = MipsCpuCaps("dsp"); // set kCpuHasMIPS_DSP.
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#if defined(__mips_dspr2)
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cpu_info_ |= kCpuHasMIPS_DSPR2;
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#endif
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cpu_info_ |= kCpuHasMIPS;
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if (getenv("LIBYUV_DISABLE_MIPS")) {
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cpu_info_ &= ~kCpuHasMIPS;
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}
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if (getenv("LIBYUV_DISABLE_MIPS_DSP")) {
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cpu_info_ &= ~kCpuHasMIPS_DSP;
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}
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if (getenv("LIBYUV_DISABLE_MIPS_DSPR2")) {
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cpu_info_ &= ~kCpuHasMIPS_DSPR2;
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}
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#elif defined(__arm__)
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#if defined(__linux__) && (defined(__ARM_NEON__) || defined(LIBYUV_NEON)) && \
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!defined(__native_client__)
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// Linux arm parse text file for neon detect.
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cpu_info_ = ArmCpuCaps("/proc/cpuinfo");
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#elif defined(__ARM_NEON__) || defined(__native_client__)
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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;
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#endif
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cpu_info_ |= kCpuHasARM;
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if (TestEnv("LIBYUV_DISABLE_NEON")) {
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cpu_info_ &= ~kCpuHasNEON;
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}
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#endif // __arm__
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if (TestEnv("LIBYUV_DISABLE_ASM")) {
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cpu_info_ = 0;
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}
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return cpu_info_;
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}
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LIBYUV_API
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void MaskCpuFlags(int enable_flags) {
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cpu_info_ = InitCpuFlags() & enable_flags;
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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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