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According to glibc memchr microbenchmark, this implementation could reduce the runtime as following: Name Percent of runtime reduced memchr-lasx 37%-83% memchr-lsx 30%-66% memchr-aligned 0%-15%
37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
/* Multiple versions of memchr.
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2023 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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/* Define multiple versions only for the definition in libc. */
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#if IS_IN (libc)
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# define memchr __redirect_memchr
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# include <string.h>
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# undef memchr
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# define SYMBOL_NAME memchr
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# include "ifunc-memchr.h"
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libc_ifunc_redirected (__redirect_memchr, memchr,
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IFUNC_SELECTOR ());
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# ifdef SHARED
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__hidden_ver1 (memchr, __GI_memchr, __redirect_memchr)
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__attribute__ ((visibility ("hidden"))) __attribute_copy__ (memchr);
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# endif
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#endif
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