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x86-64: Add wcslen optimize for sse4.1

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No bug. This comment adds the ifunc / build infrastructure
necessary for wcslen to prefer the sse4.1 implementation
in strlen-vec.S. test-wcslen.c is passing.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Noah Goldstein 2021-06-23 01:19:34 -04:00
parent a0db678071
commit 6f573a27b6
6 changed files with 63 additions and 36 deletions
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4
sysdeps/x86_64/multiarch/Makefile
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@ -95,8 +95,8 @@ sysdep_routines += wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c \
wcscpy-ssse3 wcscpy-c \
wcschr-sse2 wcschr-avx2 \
wcsrchr-sse2 wcsrchr-avx2 \
wcsnlen-sse4_1 wcsnlen-c \
wcslen-sse2 wcslen-avx2 wcsnlen-avx2 \
wcslen-sse2 wcslen-sse4_1 wcslen-avx2 \
wcsnlen-c wcsnlen-sse4_1 wcsnlen-avx2 \
wcschr-avx2-rtm \
wcscmp-avx2-rtm \
wcslen-avx2-rtm \

3
sysdeps/x86_64/multiarch/ifunc-impl-list.c
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@ -684,6 +684,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
&& CPU_FEATURE_USABLE (AVX512BW)
&& CPU_FEATURE_USABLE (BMI2)),
__wcslen_evex)
IFUNC_IMPL_ADD (array, i, wcsnlen,
CPU_FEATURE_USABLE (SSE4_1),
__wcsnlen_sse4_1)
IFUNC_IMPL_ADD (array, i, wcslen, 1, __wcslen_sse2))
/* Support sysdeps/x86_64/multiarch/wcsnlen.c. */

52
sysdeps/x86_64/multiarch/ifunc-wcslen.h Normal file
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@ -0,0 +1,52 @@
/* Common definition for ifunc selections for wcslen and wcsnlen
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 (sse4_1) 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);
}
if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
return OPTIMIZE (sse4_1);
return OPTIMIZE (sse2);
}

4
sysdeps/x86_64/multiarch/wcslen-sse4_1.S Normal file
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@ -0,0 +1,4 @@
#define AS_WCSLEN
#define strlen __wcslen_sse4_1
#include "strlen-vec.S"

2
sysdeps/x86_64/multiarch/wcslen.c
View File

@ -24,7 +24,7 @@
# undef __wcslen
# define SYMBOL_NAME wcslen
# include "ifunc-avx2.h"
# include "ifunc-wcslen.h"
libc_ifunc_redirected (__redirect_wcslen, __wcslen, IFUNC_SELECTOR ());
weak_alias (__wcslen, wcslen);

34
sysdeps/x86_64/multiarch/wcsnlen.c
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@ -24,39 +24,7 @@
# undef __wcsnlen
# define SYMBOL_NAME wcsnlen
# include <init-arch.h>
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) 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_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
{
if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
&& CPU_FEATURE_USABLE_P (cpu_features, BMI2))
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);
}
if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
return OPTIMIZE (sse4_1);
return OPTIMIZE (sse2);
}
# include "ifunc-wcslen.h"
libc_ifunc_redirected (__redirect_wcsnlen, __wcsnlen, IFUNC_SELECTOR ());
weak_alias (__wcsnlen, wcsnlen);