rtnetlink: check DO_SETLINK_NOTIFY correctly in do_setlink
[linux/fpc-iii.git] / arch / tile / lib / strlen_32.c
blobf26f88e11e4a8d9885ba10eec773b4181a5739a8
1 /*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
15 #include <linux/types.h>
16 #include <linux/string.h>
17 #include <linux/module.h>
19 size_t strlen(const char *s)
21 /* Get an aligned pointer. */
22 const uintptr_t s_int = (uintptr_t) s;
23 const uint32_t *p = (const uint32_t *)(s_int & -4);
25 /* Read the first word, but force bytes before the string to be nonzero.
26 * This expression works because we know shift counts are taken mod 32.
28 uint32_t v = *p | ((1 << (s_int << 3)) - 1);
30 uint32_t bits;
31 while ((bits = __insn_seqb(v, 0)) == 0)
32 v = *++p;
34 return ((const char *)p) + (__insn_ctz(bits) >> 3) - s;
36 EXPORT_SYMBOL(strlen);