ref: 57741d473f9d5165d142b165bd837984f6428c66
dir: /sys/src/cmd/audio/libFLAC/cpu.c/
/* libFLAC - Free Lossless Audio Codec library * Copyright (C) 2001-2009 Josh Coalson * Copyright (C) 2011-2016 Xiph.Org Foundation * * 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. * * - Neither the name of the Xiph.org Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * 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 FOUNDATION 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 "private/cpu.h" #include "share/compat.h" #include <stdlib.h> #include <string.h> #if defined _MSC_VER #include <intrin.h> /* for __cpuid() and _xgetbv() */ #elif defined __GNUC__ && defined HAVE_CPUID_H #include <cpuid.h> /* for __get_cpuid() and __get_cpuid_max() */ #endif #ifndef NDEBUG #include <stdio.h> #define dfprintf fprintf #else /* This is bad practice, it should be a static void empty function */ #define dfprintf(file, format, ...) #endif #if defined FLAC__CPU_PPC #include <sys/auxv.h> #endif #if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && (defined FLAC__HAS_NASM || FLAC__HAS_X86INTRIN) && !defined FLAC__NO_ASM /* these are flags in EDX of CPUID AX=00000001 */ static const uint32_t FLAC__CPUINFO_X86_CPUID_CMOV = 0x00008000; static const uint32_t FLAC__CPUINFO_X86_CPUID_MMX = 0x00800000; static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE = 0x02000000; static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE2 = 0x04000000; /* these are flags in ECX of CPUID AX=00000001 */ static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE3 = 0x00000001; static const uint32_t FLAC__CPUINFO_X86_CPUID_SSSE3 = 0x00000200; static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE41 = 0x00080000; static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE42 = 0x00100000; static const uint32_t FLAC__CPUINFO_X86_CPUID_OSXSAVE = 0x08000000; static const uint32_t FLAC__CPUINFO_X86_CPUID_AVX = 0x10000000; static const uint32_t FLAC__CPUINFO_X86_CPUID_FMA = 0x00001000; /* these are flags in EBX of CPUID AX=00000007 */ static const uint32_t FLAC__CPUINFO_X86_CPUID_AVX2 = 0x00000020; static uint32_t cpu_xgetbv_x86(void) { #if (defined _MSC_VER || defined __INTEL_COMPILER) && FLAC__AVX_SUPPORTED return (uint32_t)_xgetbv(0); #elif defined __GNUC__ uint32_t lo, hi; __asm__ volatile (".byte 0x0f, 0x01, 0xd0" : "=a"(lo), "=d"(hi) : "c" (0)); return lo; #else return 0; #endif } static uint32_t cpu_have_cpuid(void) { #if defined FLAC__CPU_X86_64 || defined __i686__ || defined __SSE__ || (defined _M_IX86_FP && _M_IX86_FP > 0) /* target CPU does have CPUID instruction */ return 1; #elif defined FLAC__HAS_NASM return FLAC__cpu_have_cpuid_asm_ia32(); #elif defined __GNUC__ && defined HAVE_CPUID_H if (__get_cpuid_max(0, 0) != 0) return 1; else return 0; #elif defined _MSC_VER FLAC__uint32 flags1, flags2; __asm { pushfd pushfd pop eax mov flags1, eax xor eax, 0x200000 push eax popfd pushfd pop eax mov flags2, eax popfd } if (((flags1^flags2) & 0x200000) != 0) return 1; else return 0; #else return 0; #endif } static void cpuinfo_x86(FLAC__uint32 level, FLAC__uint32 *eax, FLAC__uint32 *ebx, FLAC__uint32 *ecx, FLAC__uint32 *edx) { #if defined _MSC_VER int cpuinfo[4]; int ext = level & 0x80000000; __cpuid(cpuinfo, ext); if ((uint32_t)cpuinfo[0] >= level) { #if FLAC__AVX_SUPPORTED __cpuidex(cpuinfo, level, 0); /* for AVX2 detection */ #else __cpuid(cpuinfo, level); /* some old compilers don't support __cpuidex */ #endif *eax = cpuinfo[0]; *ebx = cpuinfo[1]; *ecx = cpuinfo[2]; *edx = cpuinfo[3]; return; } #elif defined __GNUC__ && defined HAVE_CPUID_H FLAC__uint32 ext = level & 0x80000000; __cpuid(ext, *eax, *ebx, *ecx, *edx); if (*eax >= level) { __cpuid_count(level, 0, *eax, *ebx, *ecx, *edx); return; } #elif defined FLAC__HAS_NASM && defined FLAC__CPU_IA32 FLAC__cpu_info_asm_ia32(level, eax, ebx, ecx, edx); return; #endif *eax = *ebx = *ecx = *edx = 0; } #endif static void x86_cpu_info (FLAC__CPUInfo *info) { #if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && (defined FLAC__HAS_NASM || FLAC__HAS_X86INTRIN) && !defined FLAC__NO_ASM FLAC__bool x86_osxsave = false; FLAC__bool os_avx = false; FLAC__uint32 flags_eax, flags_ebx, flags_ecx, flags_edx; info->use_asm = true; /* we assume a minimum of 80386 */ if (!cpu_have_cpuid()) return; cpuinfo_x86(0, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx); info->x86.intel = (flags_ebx == 0x756E6547 && flags_edx == 0x49656E69 && flags_ecx == 0x6C65746E) ? true : false; /* GenuineIntel */ cpuinfo_x86(1, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx); info->x86.cmov = (flags_edx & FLAC__CPUINFO_X86_CPUID_CMOV ) ? true : false; info->x86.mmx = (flags_edx & FLAC__CPUINFO_X86_CPUID_MMX ) ? true : false; info->x86.sse = (flags_edx & FLAC__CPUINFO_X86_CPUID_SSE ) ? true : false; info->x86.sse2 = (flags_edx & FLAC__CPUINFO_X86_CPUID_SSE2 ) ? true : false; info->x86.sse3 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSE3 ) ? true : false; info->x86.ssse3 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSSE3) ? true : false; info->x86.sse41 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSE41) ? true : false; info->x86.sse42 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSE42) ? true : false; if (FLAC__AVX_SUPPORTED) { x86_osxsave = (flags_ecx & FLAC__CPUINFO_X86_CPUID_OSXSAVE) ? true : false; info->x86.avx = (flags_ecx & FLAC__CPUINFO_X86_CPUID_AVX ) ? true : false; info->x86.fma = (flags_ecx & FLAC__CPUINFO_X86_CPUID_FMA ) ? true : false; cpuinfo_x86(7, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx); info->x86.avx2 = (flags_ebx & FLAC__CPUINFO_X86_CPUID_AVX2 ) ? true : false; } #if defined FLAC__CPU_IA32 dfprintf(stderr, "CPU info (IA-32):\n"); #else dfprintf(stderr, "CPU info (x86-64):\n"); #endif dfprintf(stderr, " CMOV ....... %c\n", info->x86.cmov ? 'Y' : 'n'); dfprintf(stderr, " MMX ........ %c\n", info->x86.mmx ? 'Y' : 'n'); dfprintf(stderr, " SSE ........ %c\n", info->x86.sse ? 'Y' : 'n'); dfprintf(stderr, " SSE2 ....... %c\n", info->x86.sse2 ? 'Y' : 'n'); dfprintf(stderr, " SSE3 ....... %c\n", info->x86.sse3 ? 'Y' : 'n'); dfprintf(stderr, " SSSE3 ...... %c\n", info->x86.ssse3 ? 'Y' : 'n'); dfprintf(stderr, " SSE41 ...... %c\n", info->x86.sse41 ? 'Y' : 'n'); dfprintf(stderr, " SSE42 ...... %c\n", info->x86.sse42 ? 'Y' : 'n'); if (FLAC__AVX_SUPPORTED) { dfprintf(stderr, " AVX ........ %c\n", info->x86.avx ? 'Y' : 'n'); dfprintf(stderr, " FMA ........ %c\n", info->x86.fma ? 'Y' : 'n'); dfprintf(stderr, " AVX2 ....... %c\n", info->x86.avx2 ? 'Y' : 'n'); } /* * now have to check for OS support of AVX instructions */ if (FLAC__AVX_SUPPORTED && info->x86.avx && x86_osxsave && (cpu_xgetbv_x86() & 0x6) == 0x6) { os_avx = true; } if (os_avx) { dfprintf(stderr, " AVX OS sup . %c\n", info->x86.avx ? 'Y' : 'n'); } if (!os_avx) { /* no OS AVX support */ info->x86.avx = false; info->x86.avx2 = false; info->x86.fma = false; } #else info->use_asm = false; #endif } static void ppc_cpu_info (FLAC__CPUInfo *info) { #if defined FLAC__CPU_PPC #ifndef PPC_FEATURE2_ARCH_3_00 #define PPC_FEATURE2_ARCH_3_00 0x00800000 #endif #ifndef PPC_FEATURE2_ARCH_2_07 #define PPC_FEATURE2_ARCH_2_07 0x80000000 #endif if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_3_00) { info->ppc.arch_3_00 = true; } else if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07) { info->ppc.arch_2_07 = true; } #else info->ppc.arch_2_07 = false; info->ppc.arch_3_00 = false; #endif } void FLAC__cpu_info (FLAC__CPUInfo *info) { memset(info, 0, sizeof(*info)); #ifdef FLAC__CPU_IA32 info->type = FLAC__CPUINFO_TYPE_IA32; #elif defined FLAC__CPU_X86_64 info->type = FLAC__CPUINFO_TYPE_X86_64; #elif defined FLAC__CPU_PPC info->type = FLAC__CPUINFO_TYPE_PPC; #else info->type = FLAC__CPUINFO_TYPE_UNKNOWN; #endif switch (info->type) { case FLAC__CPUINFO_TYPE_IA32: /* fallthrough */ case FLAC__CPUINFO_TYPE_X86_64: x86_cpu_info (info); break; case FLAC__CPUINFO_TYPE_PPC: ppc_cpu_info (info); break; default: info->use_asm = false; break; } }