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/* Common definition for memset/memset_chk ifunc selections.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2017-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <init-arch.h>
extern __typeof (REDIRECT_NAME) OPTIMIZE (erms) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms_rtm)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned_erms)
attribute_hidden;
static inline int
prefer_erms_nt_impl (const struct cpu_features *cpu_features)
{
return CPU_FEATURE_USABLE_P (cpu_features, ERMS)
|| !CPU_FEATURES_ARCH_P (cpu_features, Avoid_Non_Temporal_Memset);
}
static inline void *
IFUNC_SELECTOR (void)
{
const struct cpu_features *cpu_features = __get_cpu_features ();
if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS))
return OPTIMIZE (erms);
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
{
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2))
{
if (prefer_erms_nt_impl (cpu_features))
return OPTIMIZE (avx512_unaligned_erms);
return OPTIMIZE (avx512_unaligned);
}
return OPTIMIZE (avx512_no_vzeroupper);
}
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2))
{
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2))
{
if (prefer_erms_nt_impl (cpu_features))
return OPTIMIZE (evex_unaligned_erms);
return OPTIMIZE (evex_unaligned);
}
if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
{
if (prefer_erms_nt_impl (cpu_features))
return OPTIMIZE (avx2_unaligned_erms_rtm);
return OPTIMIZE (avx2_unaligned_rtm);
}
if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
Prefer_No_VZEROUPPER, !))
{
if (prefer_erms_nt_impl (cpu_features))
return OPTIMIZE (avx2_unaligned_erms);
return OPTIMIZE (avx2_unaligned);
}
}
if (CPU_FEATURE_USABLE_P (cpu_features, ERMS)
|| !CPU_FEATURES_ARCH_P (cpu_features, Avoid_Non_Temporal_Memset))
return OPTIMIZE (sse2_unaligned_erms);
return OPTIMIZE (sse2_unaligned);
}
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