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63 lines
2.2 KiB
C
63 lines
2.2 KiB
C
/* Common definition for ifunc selection optimized with EVEX.
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2017-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <init-arch.h>
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extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_rtm) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
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static inline void *
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IFUNC_SELECTOR (void)
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{
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const struct cpu_features *cpu_features = __get_cpu_features ();
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/* NB: The X86_ISA_* feature check macros are evaluated at
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compile time. */
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if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
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&& X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
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AVX_Fast_Unaligned_Load, ))
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{
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if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
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&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
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{
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if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
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return OPTIMIZE (evex_rtm);
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return OPTIMIZE (evex);
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}
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if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
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return OPTIMIZE (avx2_rtm);
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if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
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Prefer_No_VZEROUPPER, !))
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return OPTIMIZE (avx2);
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}
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/* This is unreachable (compile time checked) if ISA level >= 3
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so no need for a robust fallback here. */
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return OPTIMIZE (sse2);
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}
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