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d4697bc9 | 1 | /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
63d143a2 CM |
2 | This file is part of the GNU C Library. |
3 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <string.h> | |
20 | #include <stdint.h> | |
21 | #include "string-endian.h" | |
22 | ||
23 | void * | |
24 | __rawmemchr (const void *s, int c) | |
25 | { | |
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); | |
29 | ||
30 | /* Create eight copies of the byte for which we are looking. */ | |
64d76ca0 | 31 | const uint64_t goal = copy_byte(c); |
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32 | |
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); | |
37 | ||
38 | uint64_t bits; | |
39 | while ((bits = __insn_v1cmpeq (v, goal)) == 0) | |
40 | v = *++p; | |
41 | ||
42 | return ((char *) p) + (CFZ (bits) >> 3); | |
43 | } | |
44 | libc_hidden_def (__rawmemchr) | |
45 | weak_alias (__rawmemchr, rawmemchr) |