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/* Get x86 ISA level.
This file is part of the GNU C Library.
Copyright (C) 2020-2025 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <elf.h>
#include <cpu-features.h>
/* Get GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]
ISA level. */
static unsigned int
get_isa_level (const struct cpu_features *cpu_features)
{
unsigned int isa_level = 0;
if (CPU_FEATURE_USABLE_P (cpu_features, CMOV)
&& CPU_FEATURE_USABLE_P (cpu_features, CX8)
&& CPU_FEATURE_CPU_P (cpu_features, FPU)
&& CPU_FEATURE_USABLE_P (cpu_features, FXSR)
&& CPU_FEATURE_USABLE_P (cpu_features, MMX)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE2))
{
isa_level = GNU_PROPERTY_X86_ISA_1_BASELINE;
if (CPU_FEATURE_USABLE_P (cpu_features, CMPXCHG16B)
&& CPU_FEATURE_USABLE_P (cpu_features, LAHF64_SAHF64)
&& CPU_FEATURE_USABLE_P (cpu_features, POPCNT)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE3)
&& CPU_FEATURE_USABLE_P (cpu_features, SSSE3)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE4_1)
&& CPU_FEATURE_USABLE_P (cpu_features, SSE4_2))
{
isa_level |= GNU_PROPERTY_X86_ISA_1_V2;
if (CPU_FEATURE_USABLE_P (cpu_features, AVX)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX2)
&& CPU_FEATURE_USABLE_P (cpu_features, BMI1)
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2)
&& CPU_FEATURE_USABLE_P (cpu_features, F16C)
&& CPU_FEATURE_USABLE_P (cpu_features, FMA)
&& CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
&& CPU_FEATURE_USABLE_P (cpu_features, MOVBE))
{
isa_level |= GNU_PROPERTY_X86_ISA_1_V3;
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512CD)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
isa_level |= GNU_PROPERTY_X86_ISA_1_V4;
}
}
}
return isa_level;
}
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