projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 1999-2019 Free Software Foundation, Inc. |
| 3846ef75 UD |
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 | |
| 41bdb6e2 AJ |
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 |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://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 | |
| 9c84384c | 39 | add #1, r2 |
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40 | |
| 41 | mov.b @r4+, r1 | |
| 42 | tst r1, r1 | |
| 43 | bt 8f | |
| 9c84384c | 44 | add #1, r2 |
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45 | |
| 46 | mov.b @r4+, r1 | |
| 47 | tst r1, r1 | |
| 48 | bt 8f | |
| 9c84384c | 49 | add #1, r2 |
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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) |