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glibc/sysdeps/x86_64/strnlen.S

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x86: Add support to build strcmp/strlen/strchr with explicit ISA level 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.
2022-07-13 23:32:59 +00:00
/* strnlen dispatch for RTLD and non-multiarch build
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Add optimized x86-64 implementation of strnlen. While at it, beef up the test suite for strnlen and add performance tests for it, too.
2010-07-26 15:37:08 +00:00
x86: Add support to build strcmp/strlen/strchr with explicit ISA level 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.
2022-07-13 23:32:59 +00:00
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/>. */
#define STRNLEN __strnlen
#define DEFAULT_IMPL_V1 "multiarch/strnlen-sse2.S"
#define DEFAULT_IMPL_V3 "multiarch/strnlen-avx2.S"
#define DEFAULT_IMPL_V4 "multiarch/strnlen-evex.S"
#include "isa-default-impl.h"
weak_alias (__strnlen, strnlen)
x86: Move strlen SSE2 implementation to multiarch/strlen-sse2.S This commit doesn't affect libc.so.6, its just housekeeping to prepare for adding explicit ISA level support. Tested build on x86_64 and x86_32 with/without multiarch.
2022-07-12 19:29:01 +00:00
libc_hidden_def (__strnlen)
x86: Add support to build strcmp/strlen/strchr with explicit ISA level 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.
2022-07-13 23:32:59 +00:00
libc_hidden_def (strnlen)
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