| 1 | /* Determine the length of a string. For SPARC v9. |
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| 2 | Copyright (C) 1998-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | .register %g2, #scratch |
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| 22 | .register %g3, #scratch |
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| 23 | |
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| 24 | .text |
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| 25 | .align 32 |
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| 26 | ENTRY(strlen) |
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| 27 | mov %o0, %o1 |
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| 28 | andn %o0, 0x7, %o0 |
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| 29 | |
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| 30 | ldx [%o0], %o5 |
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| 31 | and %o1, 0x7, %g1 |
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| 32 | mov -1, %g5 |
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| 33 | |
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| 34 | sethi %hi(0x01010101), %o2 |
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| 35 | sll %g1, 3, %g1 |
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| 36 | |
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| 37 | or %o2, %lo(0x01010101), %o2 |
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| 38 | srlx %g5, %g1, %o3 |
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| 39 | |
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| 40 | sllx %o2, 32, %g1 |
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| 41 | sethi %hi(0x0000ff00), %g5 |
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| 42 | |
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| 43 | orn %o5, %o3, %o5 |
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| 44 | or %o2, %g1, %o2 |
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| 45 | |
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| 46 | sllx %o2, 7, %o3 |
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| 47 | 10: add %o0, 8, %o0 |
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| 48 | |
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| 49 | andn %o3, %o5, %g1 |
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| 50 | sub %o5, %o2, %g2 |
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| 51 | |
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| 52 | andcc %g1, %g2, %g0 |
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| 53 | be,a,pt %xcc, 10b |
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| 54 | ldx [%o0], %o5 |
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| 55 | srlx %o5, 32, %g1 |
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| 56 | |
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| 57 | andn %o3, %g1, %o4 |
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| 58 | sub %g1, %o2, %g2 |
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| 59 | |
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| 60 | add %o0, 4, %g3 |
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| 61 | andcc %o4, %g2, %g0 |
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| 62 | movne %icc, %g1, %o5 |
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| 63 | |
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| 64 | move %icc, %g3, %o0 |
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| 65 | or %g5, %lo(0x0000ff00), %g5 |
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| 66 | mov 3 - 8, %g2 |
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| 67 | |
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| 68 | andcc %o5, %g5, %g0 |
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| 69 | srlx %o5, 16, %g1 |
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| 70 | move %icc, 2 - 8, %g2 |
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| 71 | |
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| 72 | andcc %g1, 0xff, %g0 |
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| 73 | srl %o5, 24, %o5 |
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| 74 | move %icc, 1 - 8, %g2 |
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| 75 | |
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| 76 | movrz %o5, 0 - 8, %g2 |
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| 77 | sub %o0, %o1, %o0 |
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| 78 | |
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| 79 | retl |
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| 80 | add %o0, %g2, %o0 |
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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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