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1da177e4 LT |
1 | /* $Id: strlen.S,v 1.2 2001/06/29 14:07:15 gniibe Exp $ |
2 | * | |
3 | * "strlen" implementation of SuperH | |
4 | * | |
5 | * Copyright (C) 1999 Kaz Kojima | |
6 | * | |
7 | */ | |
8 | ||
9 | /* size_t strlen (const char *s) */ | |
10 | ||
11 | #include <linux/linkage.h> | |
12 | ENTRY(strlen) | |
13 | mov r4,r0 | |
14 | and #3,r0 | |
15 | tst r0,r0 | |
16 | bt/s 1f | |
17 | mov #0,r2 | |
18 | ||
19 | add #-1,r0 | |
20 | shll2 r0 | |
21 | shll r0 | |
22 | braf r0 | |
23 | nop | |
24 | ||
25 | mov.b @r4+,r1 | |
26 | tst r1,r1 | |
27 | bt 8f | |
28 | add #1,r2 | |
29 | ||
30 | mov.b @r4+,r1 | |
31 | tst r1,r1 | |
32 | bt 8f | |
33 | add #1,r2 | |
34 | ||
35 | mov.b @r4+,r1 | |
36 | tst r1,r1 | |
37 | bt 8f | |
a5c43003 | 38 | add #1,r2 |
1da177e4 LT |
39 | |
40 | 1: | |
41 | mov #0,r3 | |
42 | 2: | |
43 | mov.l @r4+,r1 | |
44 | cmp/str r3,r1 | |
45 | bf/s 2b | |
46 | add #4,r2 | |
47 | ||
48 | add #-4,r2 | |
49 | #ifndef __LITTLE_ENDIAN__ | |
50 | swap.b r1,r1 | |
51 | swap.w r1,r1 | |
52 | swap.b r1,r1 | |
53 | #endif | |
54 | extu.b r1,r0 | |
55 | tst r0,r0 | |
56 | bt/s 8f | |
57 | shlr8 r1 | |
58 | add #1,r2 | |
59 | extu.b r1,r0 | |
60 | tst r0,r0 | |
61 | bt/s 8f | |
62 | shlr8 r1 | |
63 | add #1,r2 | |
64 | extu.b r1,r0 | |
65 | tst r0,r0 | |
66 | bt 8f | |
67 | add #1,r2 | |
68 | 8: | |
69 | rts | |
70 | mov r2,r0 |