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b6a02c3606
1. Refactor files so that all implementations are in the multiarch
directory
- Moved the implementation portion of memmove sse2 from memmove.S
to multiarch/memmove-sse2.S
- The non-multiarch file now only includes one of the
implementations in the multiarch directory based on the compiled
ISA level (only used for non-multiarch builds. Otherwise we go
through the ifunc selector).
2. Add ISA level build guards to different implementations.
- I.e memmove-avx2-unaligned-erms.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 (memmove-evex-unaligned-erms.S).
3. Add new multiarch/rtld-memmove.S that just include the
non-multiarch memmove.S which will in turn select the best
implementation based on the compiled ISA level.
4. 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.
isa raising memmove
64 lines
1.8 KiB
ArmAsm
64 lines
1.8 KiB
ArmAsm
/* Optimized memmove for x86-64.
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Copyright (C) 2016-2022 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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#ifdef USE_MULTIARCH
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# if !IS_IN (libc)
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# define MEMCPY_SYMBOL(p,s) memcpy
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# endif
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#else
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# if defined SHARED && IS_IN (libc)
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# define MEMCPY_SYMBOL(p,s) __memcpy
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# else
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# define MEMCPY_SYMBOL(p,s) memcpy
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# endif
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#endif
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#if !defined USE_MULTIARCH || !IS_IN (libc)
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# define MEMPCPY_SYMBOL(p,s) __mempcpy
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#endif
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#define MEMMOVE_CHK_SYMBOL(p,s) p
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#define MEMMOVE_SYMBOL(p,s) memmove
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#define DEFAULT_IMPL_V1 "multiarch/memmove-sse2-unaligned-erms.S"
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#define DEFAULT_IMPL_V3 "multiarch/memmove-avx-unaligned-erms.S"
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#define DEFAULT_IMPL_V4 "multiarch/memmove-evex-unaligned-erms.S"
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#include "isa-default-impl.h"
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weak_alias (__mempcpy, mempcpy)
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#ifndef USE_MULTIARCH
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libc_hidden_builtin_def (memmove)
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# if defined SHARED && IS_IN (libc)
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strong_alias (memmove, __memcpy)
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libc_hidden_ver (memmove, memcpy)
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# endif
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libc_hidden_def (__mempcpy)
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weak_alias (__mempcpy, mempcpy)
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libc_hidden_builtin_def (mempcpy)
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# if defined SHARED && IS_IN (libc)
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# undef memcpy
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# include <shlib-compat.h>
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versioned_symbol (libc, __memcpy, memcpy, GLIBC_2_14);
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# endif
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#endif
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