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95f5089d4a
The "System V Application Binary Interface AMD64 Architecture Processor
Supplement" mandates the BMI1 and BMI2 CPU features for the x86-64-v3
level.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
(cherry picked from commit b80f16adbd)
70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
/* Get x86 ISA level.
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This file is part of the GNU C Library.
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Copyright (C) 2020 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <elf.h>
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#include <cpu-features.h>
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/* Get GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234]
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ISA level. */
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static unsigned int
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get_isa_level (const struct cpu_features *cpu_features)
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{
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unsigned int isa_level = 0;
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if (CPU_FEATURE_USABLE_P (cpu_features, CMOV)
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&& CPU_FEATURE_USABLE_P (cpu_features, CX8)
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&& CPU_FEATURE_CPU_P (cpu_features, FPU)
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&& CPU_FEATURE_USABLE_P (cpu_features, FXSR)
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&& CPU_FEATURE_USABLE_P (cpu_features, MMX)
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&& CPU_FEATURE_USABLE_P (cpu_features, SSE)
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&& CPU_FEATURE_USABLE_P (cpu_features, SSE2))
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{
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isa_level = GNU_PROPERTY_X86_ISA_1_BASELINE;
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if (CPU_FEATURE_USABLE_P (cpu_features, CMPXCHG16B)
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&& CPU_FEATURE_USABLE_P (cpu_features, LAHF64_SAHF64)
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&& CPU_FEATURE_USABLE_P (cpu_features, POPCNT)
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&& CPU_FEATURE_USABLE_P (cpu_features, SSE3)
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&& CPU_FEATURE_USABLE_P (cpu_features, SSSE3)
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&& CPU_FEATURE_USABLE_P (cpu_features, SSE4_1)
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&& CPU_FEATURE_USABLE_P (cpu_features, SSE4_2))
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{
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isa_level |= GNU_PROPERTY_X86_ISA_1_V2;
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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&& CPU_FEATURE_USABLE_P (cpu_features, BMI1)
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&& CPU_FEATURE_USABLE_P (cpu_features, BMI2)
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&& CPU_FEATURE_USABLE_P (cpu_features, F16C)
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&& CPU_FEATURE_USABLE_P (cpu_features, FMA)
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&& CPU_FEATURE_USABLE_P (cpu_features, LZCNT)
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&& CPU_FEATURE_USABLE_P (cpu_features, MOVBE))
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{
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isa_level |= GNU_PROPERTY_X86_ISA_1_V3;
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512CD)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
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isa_level |= GNU_PROPERTY_X86_ISA_1_V4;
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}
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}
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}
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return isa_level;
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}
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