mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 02:40:06 +00:00
83c5b36822
Since strchr-avx2.S updated by
commit 1f745ecc21
Author: noah <goldstein.w.n@gmail.com>
Date: Wed Feb 3 00:38:59 2021 -0500
x86-64: Refactor and improve performance of strchr-avx2.S
uses sarx:
c4 e2 72 f7 c0 sarx %ecx,%eax,%eax
for strchr-avx2 family functions, require BMI2 in ifunc-impl-list.c and
ifunc-avx2.h.
49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
/* Common definition for ifunc selections optimized with SSE2 and AVX2.
|
|
All versions must be listed in ifunc-impl-list.c.
|
|
Copyright (C) 2017-2021 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 (sse2) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
|
|
|
|
static inline void *
|
|
IFUNC_SELECTOR (void)
|
|
{
|
|
const struct cpu_features* cpu_features = __get_cpu_features ();
|
|
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2)
|
|
&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
|
|
{
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
|
|
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
|
|
return OPTIMIZE (evex);
|
|
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
|
|
return OPTIMIZE (avx2_rtm);
|
|
|
|
if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
|
|
return OPTIMIZE (avx2);
|
|
}
|
|
|
|
return OPTIMIZE (sse2);
|
|
}
|