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6eaf95cbfa
This patch add a optimized strcspn for POWER7 by using a different algorithm than default implementation: it constructs a table based on the 'accept' argument and use this table to check for any occurance on the input string. The idea is similar as x86_64 uses. For PowerPC some tunings were added, such as unroll loops and align stack memory to table to 16 bytes (so VSX clean can ran without alignment issues).
42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/* Copyright (C) 1991-2014 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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#undef strcspn
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#ifndef STRCSPN
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# define STRCSPN strcspn
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#endif
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/* Return the length of the maximum initial segment of S
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which contains no characters from REJECT. */
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size_t
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STRCSPN (const char *s, const char *reject)
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{
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size_t count = 0;
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while (*s != '\0')
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if (strchr (reject, *s++) == NULL)
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++count;
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else
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return count;
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return count;
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}
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libc_hidden_builtin_def (strcspn)
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