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3846ef75 UD |
1 | /* Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp> | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include <sysdep.h> | |
21 | #include <endian.h> | |
22 | ||
23 | /* size_t strlen (const char *s) */ | |
24 | ||
25 | ENTRY(strlen) | |
26 | mov r4, r0 | |
27 | and #3, r0 | |
28 | tst r0, r0 | |
29 | bt/s 1f | |
30 | mov #0, r2 | |
31 | ||
32 | add #-1, r0 | |
33 | shll2 r0 | |
34 | shll r0 | |
35 | braf r0 | |
36 | nop | |
37 | ||
38 | mov.b @r4+, r1 | |
39 | tst r1, r1 | |
40 | bt 8f | |
41 | add #1, r2 | |
42 | ||
43 | mov.b @r4+, r1 | |
44 | tst r1, r1 | |
45 | bt 8f | |
46 | add #1, r2 | |
47 | ||
48 | mov.b @r4+, r1 | |
49 | tst r1, r1 | |
50 | bt 8f | |
51 | add #1, r2 | |
52 | ||
53 | 1: | |
54 | mov #0, r3 | |
55 | 2: | |
56 | mov.l @r4+, r1 | |
57 | cmp/str r3, r1 | |
58 | bf/s 2b | |
59 | add #4, r2 | |
60 | ||
61 | add #-4, r2 | |
62 | #if __BYTE_ORDER == __BIG_ENDIAN | |
63 | swap.b r1, r1 | |
64 | swap.w r1, r1 | |
65 | swap.b r1, r1 | |
66 | #endif | |
67 | extu.b r1, r0 | |
68 | tst r0, r0 | |
69 | bt/s 8f | |
70 | shlr8 r1 | |
71 | add #1, r2 | |
72 | extu.b r1, r0 | |
73 | tst r0, r0 | |
74 | bt/s 8f | |
75 | shlr8 r1 | |
76 | add #1, r2 | |
77 | extu.b r1, r0 | |
78 | tst r0, r0 | |
79 | bt 8f | |
80 | add #1, r2 | |
81 | 8: | |
82 | rts | |
83 | mov r2, r0 | |
84 | END(strlen) |