| 1 | /* Determine the length of a string. |
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| 2 | For SPARC v7. |
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| 3 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #include <sysdep.h> |
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| 21 | |
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| 22 | .text |
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| 23 | .align 4 |
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| 24 | |
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| 25 | ENTRY(strlen) |
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| 26 | mov %o0, %o1 |
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| 27 | andn %o0, 0x3, %o0 |
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| 28 | |
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| 29 | ld [%o0], %o5 |
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| 30 | and %o1, 0x3, %g1 |
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| 31 | mov -1, %g5 |
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| 32 | |
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| 33 | sethi %hi(0x01010101), %o2 |
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| 34 | sll %g1, 3, %g1 |
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| 35 | |
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| 36 | or %o2, %lo(0x01010101), %o2 |
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| 37 | srl %g5, %g1, %g2 |
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| 38 | |
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| 39 | orn %o5, %g2, %o5 |
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| 40 | sll %o2, 7, %o3 |
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| 41 | 10: add %o0, 4, %o0 |
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| 42 | |
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| 43 | andn %o3, %o5, %g1 |
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| 44 | sub %o5, %o2, %g2 |
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| 45 | |
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| 46 | andcc %g1, %g2, %g0 |
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| 47 | be,a 10b |
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| 48 | ld [%o0], %o5 |
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| 49 | |
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| 50 | srl %o5, 24, %g1 |
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| 51 | |
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| 52 | andcc %g1, 0xff, %g0 |
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| 53 | be 90f |
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| 54 | sub %o0, 4, %o0 |
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| 55 | |
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| 56 | srl %o5, 16, %g2 |
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| 57 | |
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| 58 | andcc %g2, 0xff, %g0 |
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| 59 | be 90f |
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| 60 | add %o0, 1, %o0 |
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| 61 | |
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| 62 | srl %o5, 8, %g1 |
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| 63 | |
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| 64 | andcc %g1, 0xff, %g0 |
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| 65 | be 90f |
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| 66 | add %o0, 1, %o0 |
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| 67 | |
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| 68 | add %o0, 1, %o0 |
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| 69 | |
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| 70 | 90: retl |
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| 71 | sub %o0, %o1, %o0 |
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| 72 | END(strlen) |
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| 73 | libc_hidden_builtin_def (strlen) |
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| 74 | |
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