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25dba0ad05
This utilizes vectors and bitmasks. For small needle, large haystack, the performance improvement is upto 8x. For short strings (0-4B), the cost of computing the bitmask dominates, and is a tad slower.
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/* Multiple versions of strspn. PowerPC64 version.
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Copyright (C) 2016 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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<http://www.gnu.org/licenses/>. */
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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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#undef strspn
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extern __typeof (strspn) __libc_strspn;
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extern __typeof (strspn) __strspn_ppc attribute_hidden;
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extern __typeof (strspn) __strspn_power8 attribute_hidden;
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libc_ifunc (__libc_strspn,
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(hwcap2 & PPC_FEATURE2_ARCH_2_07)
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? __strspn_power8
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: __strspn_ppc);
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weak_alias (__libc_strspn, strspn)
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libc_hidden_builtin_def (strspn)
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