mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-28 13:31:13 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* Multiple versions of strchr.
|
|
All versions must be listed in ifunc-impl-list.c.
|
|
Copyright (C) 2009-2018 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* Define multiple versions only for the definition in libc. */
|
|
#if IS_IN (libc)
|
|
# define strchr __redirect_strchr
|
|
# include <string.h>
|
|
# undef strchr
|
|
|
|
# define SYMBOL_NAME strchr
|
|
# include <init-arch.h>
|
|
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_no_bsf) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
|
|
|
|
static inline void *
|
|
IFUNC_SELECTOR (void)
|
|
{
|
|
const struct cpu_features* cpu_features = __get_cpu_features ();
|
|
|
|
if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
|
|
&& CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable)
|
|
&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
|
|
return OPTIMIZE (avx2);
|
|
|
|
if (CPU_FEATURES_ARCH_P (cpu_features, Slow_BSF))
|
|
return OPTIMIZE (sse2_no_bsf);
|
|
|
|
return OPTIMIZE (sse2);
|
|
}
|
|
|
|
libc_ifunc_redirected (__redirect_strchr, strchr, IFUNC_SELECTOR ());
|
|
weak_alias (strchr, index)
|
|
# ifdef SHARED
|
|
__hidden_ver1 (strchr, __GI_strchr, __redirect_strchr)
|
|
__attribute__((visibility ("hidden")));
|
|
# endif
|
|
#endif
|