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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.
32 lines
1.3 KiB
ArmAsm
32 lines
1.3 KiB
ArmAsm
/* strcmp dispatch for RTLD and non-multiarch build
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Copyright (C) 1999-2022 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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/* Symbol = strcmp. */
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#define DEFAULT_IMPL_V1 "multiarch/strcmp-sse2.S"
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/* strcmp-sse2-unaligned.S is often faster than strcmp-sse42.S and
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doesn't have the drawback of using the `pcmpstri` instruction
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which can be very slow on some CPUs. */
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#define DEFAULT_IMPL_V2 "multiarch/strcmp-sse2-unaligned.S"
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#define DEFAULT_IMPL_V3 "multiarch/strcmp-avx2.S"
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#define DEFAULT_IMPL_V4 "multiarch/strcmp-evex.S"
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#include "isa-default-impl.h"
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libc_hidden_builtin_def (strcmp)
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