summaryrefslogtreecommitdiff
path: root/arch/tile/lib/memchr_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/tile/lib/memchr_32.c')
-rw-r--r--arch/tile/lib/memchr_32.c71
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);