projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 85dd1003 | 1 | /* Copyright (C) 1999, 2000, 2003 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. | |
| 3846ef75 UD |
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 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 3846ef75 UD |
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) | |
| 85dd1003 | 85 | libc_hidden_builtin_def (strlen) |