ref: 4ad7d2108133d070605b25b1eb91e32c279bf81e
dir: /celt/x86/x86cpu.c/
/* Copyright (c) 2014, Cisco Systems, INC Written by XiangMingZhu WeiZhou MinPeng YanWang Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "cpu_support.h" #include "macros.h" #include "main.h" #include "pitch.h" #include "x86cpu.h" #if (defined(OPUS_X86_MAY_HAVE_SSE) && !defined(OPUS_X86_PRESUME_SSE)) || \ (defined(OPUS_X86_MAY_HAVE_SSE2) && !defined(OPUS_X86_PRESUME_SSE2)) || \ (defined(OPUS_X86_MAY_HAVE_SSE4_1) && !defined(OPUS_X86_PRESUME_SSE4_1)) || \ (defined(OPUS_X86_MAY_HAVE_AVX) && !defined(OPUS_X86_PRESUME_AVX)) #if defined(_MSC_VER) #include <intrin.h> static _inline void cpuid(unsigned int CPUInfo[4], unsigned int InfoType) { __cpuid((int*)CPUInfo, InfoType); } #else #if defined(CPU_INFO_BY_C) #include <cpuid.h> #endif static void cpuid(unsigned int CPUInfo[4], unsigned int InfoType) { #if defined(CPU_INFO_BY_ASM) #if defined(__i386__) && defined(__PIC__) /* %ebx is PIC register in 32-bit, so mustn't clobber it. */ __asm__ __volatile__ ( "xchg %%ebx, %1\n" "cpuid\n" "xchg %%ebx, %1\n": "=a" (CPUInfo[0]), "=r" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : /* We clear ECX to avoid a valgrind false-positive prior to v3.17.0. */ "0" (InfoType), "2" (0) ); #else __asm__ __volatile__ ( "cpuid": "=a" (CPUInfo[0]), "=b" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : /* We clear ECX to avoid a valgrind false-positive prior to v3.17.0. */ "0" (InfoType), "2" (0) ); #endif #elif defined(CPU_INFO_BY_C) /* We use __get_cpuid_count to clear ECX to avoid a valgrind false-positive prior to v3.17.0.*/ if (!__get_cpuid_count(InfoType, 0, &(CPUInfo[0]), &(CPUInfo[1]), &(CPUInfo[2]), &(CPUInfo[3]))) { /* Our function cannot fail, but __get_cpuid{_count} can. Returning all zeroes will effectively disable all SIMD, which is what we want on CPUs that don't support CPUID. */ CPUInfo[3] = CPUInfo[2] = CPUInfo[1] = CPUInfo[0] = 0; } #endif } #endif typedef struct CPU_Feature{ /* SIMD: 128-bit */ int HW_SSE; int HW_SSE2; int HW_SSE41; /* SIMD: 256-bit */ int HW_AVX; } CPU_Feature; static void opus_cpu_feature_check(CPU_Feature *cpu_feature) { unsigned int info[4]; unsigned int nIds = 0; cpuid(info, 0); nIds = info[0]; if (nIds >= 1){ cpuid(info, 1); cpu_feature->HW_SSE = (info[3] & (1 << 25)) != 0; cpu_feature->HW_SSE2 = (info[3] & (1 << 26)) != 0; cpu_feature->HW_SSE41 = (info[2] & (1 << 19)) != 0; cpu_feature->HW_AVX = (info[2] & (1 << 28)) != 0; } else { cpu_feature->HW_SSE = 0; cpu_feature->HW_SSE2 = 0; cpu_feature->HW_SSE41 = 0; cpu_feature->HW_AVX = 0; } } static int opus_select_arch_impl(void) { CPU_Feature cpu_feature; int arch; opus_cpu_feature_check(&cpu_feature); arch = 0; if (!cpu_feature.HW_SSE) { return arch; } arch++; if (!cpu_feature.HW_SSE2) { return arch; } arch++; if (!cpu_feature.HW_SSE41) { return arch; } arch++; if (!cpu_feature.HW_AVX) { return arch; } arch++; return arch; } int opus_select_arch(void) { int arch = opus_select_arch_impl(); #ifdef FUZZING /* Randomly downgrade the architecture. */ arch = rand()%(arch+1); #endif return arch; } #endif