diff options
Diffstat (limited to 'arch/tile/lib/memchr_32.c')
-rw-r--r-- | arch/tile/lib/memchr_32.c | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/arch/tile/lib/memchr_32.c b/arch/tile/lib/memchr_32.c deleted file mode 100644 index cc3d9badf030..000000000000 --- a/arch/tile/lib/memchr_32.c +++ /dev/null @@ -1,71 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - */ - -#include <linux/types.h> -#include <linux/string.h> -#include <linux/module.h> - -void *memchr(const void *s, int c, size_t n) -{ - const uint32_t *last_word_ptr; - const uint32_t *p; - const char *last_byte_ptr; - uintptr_t s_int; - uint32_t goal, before_mask, v, bits; - char *ret; - - if (__builtin_expect(n == 0, 0)) { - /* Don't dereference any memory if the array is empty. */ - return NULL; - } - - /* Get an aligned pointer. */ - s_int = (uintptr_t) s; - p = (const uint32_t *)(s_int & -4); - - /* Create four copies of the byte for which we are looking. */ - goal = 0x01010101 * (uint8_t) c; - - /* Read the first word, but munge it so that bytes before the array - * will not match goal. - * - * Note that this shift count expression works because we know - * shift counts are taken mod 32. - */ - before_mask = (1 << (s_int << 3)) - 1; - v = (*p | before_mask) ^ (goal & before_mask); - - /* Compute the address of the last byte. */ - last_byte_ptr = (const char *)s + n - 1; - - /* Compute the address of the word containing the last byte. */ - last_word_ptr = (const uint32_t *)((uintptr_t) last_byte_ptr & -4); - - while ((bits = __insn_seqb(v, goal)) == 0) { - if (__builtin_expect(p == last_word_ptr, 0)) { - /* We already read the last word in the array, - * so give up. - */ - return NULL; - } - v = *++p; - } - - /* We found a match, but it might be in a byte past the end - * of the array. - */ - ret = ((char *)p) + (__insn_ctz(bits) >> 3); - return (ret <= last_byte_ptr) ? ret : NULL; -} -EXPORT_SYMBOL(memchr); |