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255 lines
8.5 KiB
C
255 lines
8.5 KiB
C
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/* libFLAC - Free Lossless Audio Codec library
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* Copyright (C) 2001-2009 Josh Coalson
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* Copyright (C) 2011-2016 Xiph.Org Foundation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "private/cpu.h"
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#include "share/compat.h"
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#include <stdlib.h>
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#include <string.h>
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#if defined _MSC_VER
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#include <intrin.h> /* for __cpuid() and _xgetbv() */
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#elif defined __GNUC__ && defined HAVE_CPUID_H
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#include <cpuid.h> /* for __get_cpuid() and __get_cpuid_max() */
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#endif
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#ifndef NDEBUG
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#include <stdio.h>
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#define dfprintf fprintf
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#else
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/* This is bad practice, it should be a static void empty function */
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#define dfprintf(file, format, ...)
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#endif
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#if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && (defined FLAC__HAS_NASM || FLAC__HAS_X86INTRIN) && !defined FLAC__NO_ASM
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/* these are flags in EDX of CPUID AX=00000001 */
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static const uint32_t FLAC__CPUINFO_X86_CPUID_CMOV = 0x00008000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_MMX = 0x00800000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE = 0x02000000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE2 = 0x04000000;
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/* these are flags in ECX of CPUID AX=00000001 */
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static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE3 = 0x00000001;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_SSSE3 = 0x00000200;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE41 = 0x00080000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_SSE42 = 0x00100000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_OSXSAVE = 0x08000000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_AVX = 0x10000000;
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static const uint32_t FLAC__CPUINFO_X86_CPUID_FMA = 0x00001000;
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/* these are flags in EBX of CPUID AX=00000007 */
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static const uint32_t FLAC__CPUINFO_X86_CPUID_AVX2 = 0x00000020;
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static uint32_t
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cpu_xgetbv_x86(void)
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{
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#if (defined _MSC_VER || defined __INTEL_COMPILER) && FLAC__AVX_SUPPORTED
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return (uint32_t)_xgetbv(0);
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#elif defined __GNUC__
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uint32_t lo, hi;
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__asm__ volatile (".byte 0x0f, 0x01, 0xd0" : "=a"(lo), "=d"(hi) : "c" (0));
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return lo;
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#else
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return 0;
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#endif
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}
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static uint32_t
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cpu_have_cpuid(void)
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{
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#if defined FLAC__CPU_X86_64 || defined __i686__ || defined __SSE__ || (defined _M_IX86_FP && _M_IX86_FP > 0)
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/* target CPU does have CPUID instruction */
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return 1;
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#elif defined FLAC__HAS_NASM
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return FLAC__cpu_have_cpuid_asm_ia32();
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#elif defined __GNUC__ && defined HAVE_CPUID_H
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if (__get_cpuid_max(0, 0) != 0)
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return 1;
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else
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return 0;
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#elif defined _MSC_VER
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FLAC__uint32 flags1, flags2;
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__asm {
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pushfd
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pushfd
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pop eax
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mov flags1, eax
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xor eax, 0x200000
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push eax
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popfd
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pushfd
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pop eax
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mov flags2, eax
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popfd
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}
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if (((flags1^flags2) & 0x200000) != 0)
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return 1;
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else
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return 0;
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#else
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return 0;
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#endif
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}
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static void
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cpuinfo_x86(FLAC__uint32 level, FLAC__uint32 *eax, FLAC__uint32 *ebx, FLAC__uint32 *ecx, FLAC__uint32 *edx)
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{
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#if defined _MSC_VER
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int cpuinfo[4];
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int ext = level & 0x80000000;
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__cpuid(cpuinfo, ext);
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if ((uint32_t)cpuinfo[0] >= level) {
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#if FLAC__AVX_SUPPORTED
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__cpuidex(cpuinfo, level, 0); /* for AVX2 detection */
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#else
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__cpuid(cpuinfo, level); /* some old compilers don't support __cpuidex */
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#endif
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*eax = cpuinfo[0]; *ebx = cpuinfo[1]; *ecx = cpuinfo[2]; *edx = cpuinfo[3];
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return;
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}
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#elif defined __GNUC__ && defined HAVE_CPUID_H
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FLAC__uint32 ext = level & 0x80000000;
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__cpuid(ext, *eax, *ebx, *ecx, *edx);
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if (*eax >= level) {
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__cpuid_count(level, 0, *eax, *ebx, *ecx, *edx);
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return;
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}
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#elif defined FLAC__HAS_NASM && defined FLAC__CPU_IA32
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FLAC__cpu_info_asm_ia32(level, eax, ebx, ecx, edx);
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return;
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#endif
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*eax = *ebx = *ecx = *edx = 0;
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}
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#endif
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static void
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x86_cpu_info (FLAC__CPUInfo *info)
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{
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#if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && (defined FLAC__HAS_NASM || FLAC__HAS_X86INTRIN) && !defined FLAC__NO_ASM
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FLAC__bool x86_osxsave = false;
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FLAC__bool os_avx = false;
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FLAC__uint32 flags_eax, flags_ebx, flags_ecx, flags_edx;
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info->use_asm = true; /* we assume a minimum of 80386 */
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if (!cpu_have_cpuid())
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return;
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cpuinfo_x86(0, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx);
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info->x86.intel = (flags_ebx == 0x756E6547 && flags_edx == 0x49656E69 && flags_ecx == 0x6C65746E) ? true : false; /* GenuineIntel */
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cpuinfo_x86(1, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx);
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info->x86.cmov = (flags_edx & FLAC__CPUINFO_X86_CPUID_CMOV ) ? true : false;
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info->x86.mmx = (flags_edx & FLAC__CPUINFO_X86_CPUID_MMX ) ? true : false;
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info->x86.sse = (flags_edx & FLAC__CPUINFO_X86_CPUID_SSE ) ? true : false;
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info->x86.sse2 = (flags_edx & FLAC__CPUINFO_X86_CPUID_SSE2 ) ? true : false;
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info->x86.sse3 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSE3 ) ? true : false;
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info->x86.ssse3 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSSE3) ? true : false;
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info->x86.sse41 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSE41) ? true : false;
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info->x86.sse42 = (flags_ecx & FLAC__CPUINFO_X86_CPUID_SSE42) ? true : false;
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if (FLAC__AVX_SUPPORTED) {
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x86_osxsave = (flags_ecx & FLAC__CPUINFO_X86_CPUID_OSXSAVE) ? true : false;
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info->x86.avx = (flags_ecx & FLAC__CPUINFO_X86_CPUID_AVX ) ? true : false;
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info->x86.fma = (flags_ecx & FLAC__CPUINFO_X86_CPUID_FMA ) ? true : false;
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cpuinfo_x86(7, &flags_eax, &flags_ebx, &flags_ecx, &flags_edx);
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info->x86.avx2 = (flags_ebx & FLAC__CPUINFO_X86_CPUID_AVX2 ) ? true : false;
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}
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#if defined FLAC__CPU_IA32
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dfprintf(stderr, "CPU info (IA-32):\n");
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#else
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dfprintf(stderr, "CPU info (x86-64):\n");
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#endif
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dfprintf(stderr, " CMOV ....... %c\n", info->x86.cmov ? 'Y' : 'n');
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dfprintf(stderr, " MMX ........ %c\n", info->x86.mmx ? 'Y' : 'n');
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dfprintf(stderr, " SSE ........ %c\n", info->x86.sse ? 'Y' : 'n');
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dfprintf(stderr, " SSE2 ....... %c\n", info->x86.sse2 ? 'Y' : 'n');
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dfprintf(stderr, " SSE3 ....... %c\n", info->x86.sse3 ? 'Y' : 'n');
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dfprintf(stderr, " SSSE3 ...... %c\n", info->x86.ssse3 ? 'Y' : 'n');
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dfprintf(stderr, " SSE41 ...... %c\n", info->x86.sse41 ? 'Y' : 'n');
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dfprintf(stderr, " SSE42 ...... %c\n", info->x86.sse42 ? 'Y' : 'n');
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if (FLAC__AVX_SUPPORTED) {
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dfprintf(stderr, " AVX ........ %c\n", info->x86.avx ? 'Y' : 'n');
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dfprintf(stderr, " FMA ........ %c\n", info->x86.fma ? 'Y' : 'n');
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dfprintf(stderr, " AVX2 ....... %c\n", info->x86.avx2 ? 'Y' : 'n');
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}
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/*
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* now have to check for OS support of AVX instructions
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*/
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if (FLAC__AVX_SUPPORTED && info->x86.avx && x86_osxsave && (cpu_xgetbv_x86() & 0x6) == 0x6) {
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os_avx = true;
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}
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if (os_avx) {
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dfprintf(stderr, " AVX OS sup . %c\n", info->x86.avx ? 'Y' : 'n');
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}
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if (!os_avx) {
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/* no OS AVX support */
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info->x86.avx = false;
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info->x86.avx2 = false;
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info->x86.fma = false;
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}
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#else
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info->use_asm = false;
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#endif
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}
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void FLAC__cpu_info (FLAC__CPUInfo *info)
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{
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memset(info, 0, sizeof(*info));
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#ifdef FLAC__CPU_IA32
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info->type = FLAC__CPUINFO_TYPE_IA32;
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#elif defined FLAC__CPU_X86_64
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info->type = FLAC__CPUINFO_TYPE_X86_64;
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#else
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info->type = FLAC__CPUINFO_TYPE_UNKNOWN;
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#endif
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switch (info->type) {
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case FLAC__CPUINFO_TYPE_IA32: /* fallthrough */
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case FLAC__CPUINFO_TYPE_X86_64:
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x86_cpu_info (info);
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break;
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default:
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info->use_asm = false;
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break;
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}
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}
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