1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
21 #include "string-endian.h"
24 __rawmemchr (const void *s, int c)
26 /* Get an aligned pointer. */
27 const uintptr_t s_int = (uintptr_t) s;
28 const uint64_t *p = (const uint64_t *) (s_int & -8);
30 /* Create eight copies of the byte for which we are looking. */
31 const uint64_t goal = copy_byte(c);
33 /* Read the first word, but munge it so that bytes before the array
34 will not match goal. */
35 const uint64_t before_mask = MASK (s_int);
36 uint64_t v = (*p | before_mask) ^ (goal & before_mask);
39 while ((bits = __insn_v1cmpeq (v, goal)) == 0)
42 return ((char *) p) + (CFZ (bits) >> 3);
44 libc_hidden_def (__rawmemchr)
45 weak_alias (__rawmemchr, rawmemchr)