mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +00:00
ceabdcd130
1. Add default ISA level selection in non-multiarch/rtld
implementations.
2. Add ISA level build guards to different implementations.
- I.e strcmp-avx2.S which is ISA level 3 will only build if
compiled ISA level <= 3. Otherwise there is no reason to
include it as we will always use one of the ISA level 4
implementations (strcmp-evex.S).
3. Refactor the ifunc selector and ifunc implementation list to use
the ISA level aware wrapper macros that allow functions below the
compiled ISA level (with a guranteed replacement) to be skipped.
Tested with and without multiarch on x86_64 for ISA levels:
{generic, x86-64-v2, x86-64-v3, x86-64-v4}
And m32 with and without multiarch.
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/* Common definition for ifunc selections for wcslen and wcsnlen
|
|
All versions must be listed in ifunc-impl-list.c.
|
|
Copyright (C) 2017-2022 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/>. */
|
|
|
|
#include <init-arch.h>
|
|
|
|
#ifndef GENERIC
|
|
# define GENERIC sse2
|
|
#endif
|
|
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
|
|
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
|
|
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden;
|
|
|
|
extern __typeof (REDIRECT_NAME) OPTIMIZE (GENERIC) attribute_hidden;
|
|
|
|
static inline void *
|
|
IFUNC_SELECTOR (void)
|
|
{
|
|
const struct cpu_features *cpu_features = __get_cpu_features ();
|
|
|
|
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
|
|
&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
|
|
&& X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
|
|
AVX_Fast_Unaligned_Load, ))
|
|
{
|
|
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
|
|
&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
|
|
return OPTIMIZE (evex);
|
|
|
|
if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
|
|
return OPTIMIZE (avx2_rtm);
|
|
|
|
if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
|
|
Prefer_No_VZEROUPPER, !))
|
|
return OPTIMIZE (avx2);
|
|
}
|
|
|
|
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
|
|
return OPTIMIZE (sse4_1);
|
|
|
|
return OPTIMIZE (GENERIC);
|
|
}
|