| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1999-2015 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 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. |
| 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 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <sysdep.h> |
| 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 |
| 60 | #ifdef __BIG_ENDIAN__ |
| 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) |
| 83 | libc_hidden_builtin_def (strlen) |