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568035b7 | 1 | /* Copyright (C) 1999-2013 Free Software Foundation, Inc. |
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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 | |
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6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
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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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
3846ef75 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <sysdep.h> | |
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20 | |
21 | /* size_t strlen (const char *s) */ | |
22 | ||
23 | ENTRY(strlen) | |
24 | mov r4, r0 | |
25 | and #3, r0 | |
26 | tst r0, r0 | |
27 | bt/s 1f | |
28 | mov #0, r2 | |
29 | ||
30 | add #-1, r0 | |
31 | shll2 r0 | |
32 | shll r0 | |
33 | braf r0 | |
34 | nop | |
35 | ||
36 | mov.b @r4+, r1 | |
37 | tst r1, r1 | |
38 | bt 8f | |
39 | add #1, r2 | |
40 | ||
41 | mov.b @r4+, r1 | |
42 | tst r1, r1 | |
43 | bt 8f | |
44 | add #1, r2 | |
45 | ||
46 | mov.b @r4+, r1 | |
47 | tst r1, r1 | |
48 | bt 8f | |
49 | add #1, r2 | |
50 | ||
51 | 1: | |
52 | mov #0, r3 | |
53 | 2: | |
54 | mov.l @r4+, r1 | |
55 | cmp/str r3, r1 | |
56 | bf/s 2b | |
57 | add #4, r2 | |
58 | ||
59 | add #-4, r2 | |
3ce2865f | 60 | #ifdef __BIG_ENDIAN__ |
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61 | swap.b r1, r1 |
62 | swap.w r1, r1 | |
63 | swap.b r1, r1 | |
64 | #endif | |
65 | extu.b r1, r0 | |
66 | tst r0, r0 | |
67 | bt/s 8f | |
68 | shlr8 r1 | |
69 | add #1, r2 | |
70 | extu.b r1, r0 | |
71 | tst r0, r0 | |
72 | bt/s 8f | |
73 | shlr8 r1 | |
74 | add #1, r2 | |
75 | extu.b r1, r0 | |
76 | tst r0, r0 | |
77 | bt 8f | |
78 | add #1, r2 | |
79 | 8: | |
80 | rts | |
81 | mov r2, r0 | |
82 | END(strlen) | |
85dd1003 | 83 | libc_hidden_builtin_def (strlen) |