/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2001-2009 Josh Coalson
* Copyright (C) 2011-2025 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
#if defined(HAVE_SYS_AUXV_H)
#include <sys/auxv.h>
#endif
#if (defined FLAC__CPU_IA32 || defined FLAC__CPU_X86_64) && 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 const uint32_t FLAC__CPUINFO_X86_CPUID_BMI2 = 0x00000100;
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 __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;
}
#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) && 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;
info->x86.bmi2 = (flags_ebx & FLAC__CPUINFO_X86_CPUID_BMI2 ) ? true : false;
}
/*
* 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) {
/* no OS AVX support */
info->x86.avx = false;
info->x86.avx2 = false;
info->x86.fma = false;
}
#else
info->use_asm = 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;
#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;
default:
info->use_asm = false;
break;
}
}