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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.
50 lines
1.8 KiB
ArmAsm
50 lines
1.8 KiB
ArmAsm
/* wcsnlen dispatch for RTLD and non-multiarch .c files
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* wcsnlen non-multiarch build is split into two files,
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wcsnlen-generic.c and wcsnlen.S. The wcsnlen.S build is for
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ISA level >= 2 uses the optimized assembly implementations in
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multiarch/wcsnlen*.S. This must be split into two files because
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we cannot include C code from assembly or vice versa. */
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#include <isa-level.h>
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#if MINIMUM_X86_ISA_LEVEL >= 2
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# define WCSNLEN __wcsnlen
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/* This symbol must stay linked to the name in wcslen.S. */
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#if IS_IN (rtld)
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# define OVERFLOW_STRLEN __wcslen
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#else
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# define OVERFLOW_STRLEN HIDDEN_JUMPTARGET (__wcslen)
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#endif
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# define DEFAULT_IMPL_V2 "multiarch/wcsnlen-sse4_1.S"
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# define DEFAULT_IMPL_V3 "multiarch/wcsnlen-avx2.S"
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# define DEFAULT_IMPL_V4 "multiarch/wcsnlen-evex.S"
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/* isa-default-impl.h expects DEFAULT_IMPL_V1 to be defined but it
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should never be used from here. */
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# define DEFAULT_IMPL_V1 "ERROR -- Invalid ISA IMPL"
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# include "isa-default-impl.h"
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weak_alias (__wcsnlen, wcsnlen)
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libc_hidden_def (__wcsnlen)
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#endif
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