| 1 | /* Copyright (C) 1999-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <sysdep.h> |
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| 19 | |
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| 20 | /* size_t strlen (const char *s) */ |
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| 21 | |
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| 22 | ENTRY(strlen) |
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| 23 | mov r4, r0 |
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| 24 | and #3, r0 |
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| 25 | tst r0, r0 |
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| 26 | bt/s 1f |
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| 27 | mov #0, r2 |
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| 28 | |
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| 29 | add #-1, r0 |
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| 30 | shll2 r0 |
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| 31 | shll r0 |
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| 32 | braf r0 |
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| 33 | nop |
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| 34 | |
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| 35 | mov.b @r4+, r1 |
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| 36 | tst r1, r1 |
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| 37 | bt 8f |
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| 38 | add #1, r2 |
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| 39 | |
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| 40 | mov.b @r4+, r1 |
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| 41 | tst r1, r1 |
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| 42 | bt 8f |
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| 43 | add #1, r2 |
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| 44 | |
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| 45 | mov.b @r4+, r1 |
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| 46 | tst r1, r1 |
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| 47 | bt 8f |
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| 48 | add #1, r2 |
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| 49 | |
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| 50 | 1: |
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| 51 | mov #0, r3 |
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| 52 | 2: |
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| 53 | mov.l @r4+, r1 |
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| 54 | cmp/str r3, r1 |
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| 55 | bf/s 2b |
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| 56 | add #4, r2 |
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| 57 | |
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| 58 | add #-4, r2 |
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| 59 | #ifdef __BIG_ENDIAN__ |
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| 60 | swap.b r1, r1 |
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| 61 | swap.w r1, r1 |
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| 62 | swap.b r1, r1 |
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| 63 | #endif |
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| 64 | extu.b r1, r0 |
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| 65 | tst r0, r0 |
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| 66 | bt/s 8f |
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| 67 | shlr8 r1 |
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| 68 | add #1, r2 |
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| 69 | extu.b r1, r0 |
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| 70 | tst r0, r0 |
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| 71 | bt/s 8f |
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| 72 | shlr8 r1 |
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| 73 | add #1, r2 |
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| 74 | extu.b r1, r0 |
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| 75 | tst r0, r0 |
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| 76 | bt 8f |
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| 77 | add #1, r2 |
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| 78 | 8: |
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| 79 | rts |
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| 80 | mov r2, r0 |
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| 81 | END(strlen) |
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| 82 | libc_hidden_builtin_def (strlen) |
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| 83 | |
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