mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
|
/* 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
|
||
|
|
|
||
|
|
# 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
|