| /* Copyright (C) 1999-2016 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp> |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| |
| /* size_t strlen (const char *s) */ |
| |
| ENTRY(strlen) |
| mov r4, r0 |
| and #3, r0 |
| tst r0, r0 |
| bt/s 1f |
| mov #0, r2 |
| |
| add #-1, r0 |
| shll2 r0 |
| shll r0 |
| braf r0 |
| nop |
| |
| mov.b @r4+, r1 |
| tst r1, r1 |
| bt 8f |
| add #1, r2 |
| |
| mov.b @r4+, r1 |
| tst r1, r1 |
| bt 8f |
| add #1, r2 |
| |
| mov.b @r4+, r1 |
| tst r1, r1 |
| bt 8f |
| add #1, r2 |
| |
| 1: |
| mov #0, r3 |
| 2: |
| mov.l @r4+, r1 |
| cmp/str r3, r1 |
| bf/s 2b |
| add #4, r2 |
| |
| add #-4, r2 |
| #ifdef __BIG_ENDIAN__ |
| swap.b r1, r1 |
| swap.w r1, r1 |
| swap.b r1, r1 |
| #endif |
| extu.b r1, r0 |
| tst r0, r0 |
| bt/s 8f |
| shlr8 r1 |
| add #1, r2 |
| extu.b r1, r0 |
| tst r0, r0 |
| bt/s 8f |
| shlr8 r1 |
| add #1, r2 |
| extu.b r1, r0 |
| tst r0, r0 |
| bt 8f |
| add #1, r2 |
| 8: |
| rts |
| mov r2, r0 |
| END(strlen) |
| libc_hidden_builtin_def (strlen) |