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1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. |
3 | * |
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. |
7 | * |
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. |
13 | */ |
14 | |
15 | #include <linux/types.h> |
16 | #include <linux/string.h> |
17 | #include <linux/module.h> |
18 | |
19 | void *memmove(void *dest, const void *src, size_t n) |
20 | { |
21 | if ((const char *)src >= (char *)dest + n |
22 | || (char *)dest >= (const char *)src + n) { |
23 | /* We found no overlap, so let memcpy do all the heavy |
24 | * lifting (prefetching, etc.) |
25 | */ |
26 | return memcpy(dest, src, n); |
27 | } |
28 | |
29 | if (n != 0) { |
30 | const uint8_t *in; |
31 | uint8_t x; |
32 | uint8_t *out; |
33 | int stride; |
34 | |
35 | if (src < dest) { |
36 | /* copy backwards */ |
37 | in = (const uint8_t *)src + n - 1; |
38 | out = (uint8_t *)dest + n - 1; |
39 | stride = -1; |
40 | } else { |
41 | /* copy forwards */ |
42 | in = (const uint8_t *)src; |
43 | out = (uint8_t *)dest; |
44 | stride = 1; |
45 | } |
46 | |
47 | /* Manually software-pipeline this loop. */ |
48 | x = *in; |
49 | in += stride; |
50 | |
51 | while (--n != 0) { |
52 | *out = x; |
53 | out += stride; |
54 | x = *in; |
55 | in += stride; |
56 | } |
57 | |
58 | *out = x; |
59 | } |
60 | |
61 | return dest; |
62 | } |
63 | EXPORT_SYMBOL(memmove); |
64 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9