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40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/* Copyright (C) 2011-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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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 <stdint.h>
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#include "string-endian.h"
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size_t
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strlen (const char *s)
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{
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/* Get an aligned pointer. */
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const uintptr_t s_int = (uintptr_t) s;
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const uint64_t *p = (const uint64_t *) (s_int & -8);
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/* Read and MASK the first word. */
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uint64_t v = *p | MASK (s_int);
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uint64_t bits;
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while ((bits = __insn_v1cmpeqi (v, 0)) == 0)
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v = *++p;
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return ((const char *) p) + (CFZ (bits) >> 3) - s;
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}
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libc_hidden_builtin_def (strlen)
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