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765de945ef
This version uses vector instructions and is up to 60% faster on medium
matches and up to 90% faster on long matches, compared to the POWER7
version. A few examples:
__rawmemchr_power9 __rawmemchr_power7
Length 32, alignment 0: 2.27566 3.77765
Length 64, alignment 2: 2.46231 3.51064
Length 1024, alignment 0: 17.3059 32.6678
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* Multiple versions of rawmemchr.
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Copyright (C) 2013-2020 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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#if IS_IN (libc)
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# define __rawmemchr __redirect___rawmemchr
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# include <string.h>
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# include <shlib-compat.h>
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# include "init-arch.h"
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extern __typeof (__rawmemchr) __rawmemchr_ppc attribute_hidden;
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extern __typeof (__rawmemchr) __rawmemchr_power7 attribute_hidden;
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# ifdef __LITTLE_ENDIAN__
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extern __typeof (__rawmemchr) __rawmemchr_power9 attribute_hidden;
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# endif
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# undef __rawmemchr
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/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
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ifunc symbol properly. */
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libc_ifunc_redirected (__redirect___rawmemchr, __rawmemchr,
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# ifdef __LITTLE_ENDIAN__
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(hwcap2 & PPC_FEATURE2_ARCH_3_00)
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? __rawmemchr_power9 :
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# endif
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(hwcap & PPC_FEATURE_HAS_VSX)
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? __rawmemchr_power7
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: __rawmemchr_ppc);
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weak_alias (__rawmemchr, rawmemchr)
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#else
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#include <string/rawmemchr.c>
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#endif
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