mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
/* Common definition for ifunc selections optimized with SSE2 and SSE4.2.
|
|
All versions must be listed in ifunc-impl-list.c.
|
|
Copyright (C) 2017-2023 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 (generic) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse42) attribute_hidden;
|
|
|
|
static inline void *
|
|
IFUNC_SELECTOR (void)
|
|
{
|
|
const struct cpu_features* cpu_features = __get_cpu_features ();
|
|
|
|
/* This function uses the `pcmpstri` sse4.2 instruction which can be
|
|
slow on some CPUs. This normally would be guarded by a
|
|
Slow_SSE4_2 check, but since there is no other optimized
|
|
implementation its best to keep it regardless. If an optimized
|
|
fallback is added add a X86_ISA_CPU_FEATURE_ARCH_P (cpu_features,
|
|
Slow_SSE4_2) check. */
|
|
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSE4_2))
|
|
return OPTIMIZE (sse42);
|
|
|
|
return OPTIMIZE (generic);
|
|
}
|