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/* Multiple versions of bzero.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2022 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/>. */
/* Define multiple versions only for the definition in libc. */
#if IS_IN (libc)
# define __bzero __redirect___bzero
# include <string.h>
# undef __bzero
/* OPTIMIZE1 definition required for bzero patch. */
# define OPTIMIZE1(name) EVALUATOR1 (SYMBOL_NAME, name)
# define SYMBOL_NAME __bzero
# include <init-arch.h>
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (sse2_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (sse2_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_unaligned) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_unaligned_rtm)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_unaligned_erms_rtm)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (evex_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (evex_unaligned_erms)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx512_unaligned)
attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx512_unaligned_erms)
attribute_hidden;
static inline void *
IFUNC_SELECTOR (void)
{
const struct cpu_features* cpu_features = __get_cpu_features ();
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
{
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2))
{
if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
return OPTIMIZE1 (avx512_unaligned_erms);
return OPTIMIZE1 (avx512_unaligned);
}
}
if (CPU_FEATURE_USABLE_P (cpu_features, AVX2))
{
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2))
{
if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
return OPTIMIZE1 (evex_unaligned_erms);
return OPTIMIZE1 (evex_unaligned);
}
if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
{
if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
return OPTIMIZE1 (avx2_unaligned_erms_rtm);
return OPTIMIZE1 (avx2_unaligned_rtm);
}
if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
{
if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
return OPTIMIZE1 (avx2_unaligned_erms);
return OPTIMIZE1 (avx2_unaligned);
}
}
if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
return OPTIMIZE1 (sse2_unaligned_erms);
return OPTIMIZE1 (sse2_unaligned);
}
libc_ifunc_redirected (__redirect___bzero, __bzero, IFUNC_SELECTOR ());
weak_alias (__bzero, bzero)
#endif
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