| 1 | /* Copy SRC to DEST returning DEST. |
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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 | /* Normally, this uses ((xword - 0x01010101) & 0x80808080) test |
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| 23 | to find out if any byte in xword could be zero. This is fast, but |
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| 24 | also gives false alarm for any byte in range 0x81-0xff. It does |
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| 25 | not matter for correctness, as if this test tells us there could |
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| 26 | be some zero byte, we check it byte by byte, but if bytes with |
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| 27 | high bits set are common in the strings, then this will give poor |
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| 28 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm |
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| 29 | will use one tick slower, but more precise test |
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| 30 | ((xword - 0x01010101) & (~xword) & 0x80808080), |
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| 31 | which does not give any false alarms (but if some bits are set, |
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| 32 | one cannot assume from it which bytes are zero and which are not). |
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| 33 | It is yet to be measured, what is the correct default for glibc |
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| 34 | in these days for an average user. |
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| 35 | */ |
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| 36 | |
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| 37 | .text |
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| 38 | .align 4 |
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| 39 | |
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| 40 | ENTRY(strcpy) |
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| 41 | mov %o0, %g2 |
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| 42 | andcc %o1, 3, %g0 |
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| 43 | be 10f |
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| 44 | sethi %hi(0x80808080), %o4 |
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| 45 | |
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| 46 | ldub [%o1], %o5 |
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| 47 | stb %o5, [%o0] |
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| 48 | cmp %o5, 0 |
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| 49 | add %o0, 1, %o0 |
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| 50 | be 0f |
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| 51 | add %o1, 1, %o1 |
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| 52 | andcc %o1, 3, %g0 |
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| 53 | be 4f |
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| 54 | or %o4, %lo(0x80808080), %o3 |
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| 55 | ldub [%o1], %o5 |
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| 56 | stb %o5, [%o0] |
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| 57 | cmp %o5, 0 |
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| 58 | add %o0, 1, %o0 |
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| 59 | be 0f |
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| 60 | add %o1, 1, %o1 |
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| 61 | andcc %o1, 3, %g0 |
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| 62 | be 5f |
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| 63 | sethi %hi(0x01010101), %o4 |
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| 64 | ldub [%o1], %o5 |
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| 65 | stb %o5, [%o0] |
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| 66 | cmp %o5, 0 |
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| 67 | add %o0, 1, %o0 |
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| 68 | be 0f |
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| 69 | add %o1, 1, %o1 |
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| 70 | b 6f |
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| 71 | andcc %o0, 3, %g3 |
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| 72 | |
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| 73 | 10: or %o4, %lo(0x80808080), %o3 |
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| 74 | 4: sethi %hi(0x01010101), %o4 |
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| 75 | 5: andcc %o0, 3, %g3 |
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| 76 | 6: bne 10f |
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| 77 | or %o4, %lo(0x01010101), %o2 |
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| 78 | 1: ld [%o1], %o5 |
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| 79 | add %o1, 4, %o1 |
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| 80 | sub %o5, %o2, %o4 |
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| 81 | add %o0, 4, %o0 |
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| 82 | andcc %o4, %o3, %g0 |
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| 83 | be,a 1b |
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| 84 | st %o5, [%o0 - 4] |
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| 85 | |
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| 86 | srl %o5, 24, %g5 |
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| 87 | andcc %g5, 0xff, %g0 |
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| 88 | be 1f |
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| 89 | srl %o5, 16, %g5 |
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| 90 | andcc %g5, 0xff, %g0 |
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| 91 | be 2f |
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| 92 | srl %o5, 8, %g5 |
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| 93 | andcc %g5, 0xff, %g0 |
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| 94 | be 3f |
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| 95 | andcc %o5, 0xff, %g0 |
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| 96 | bne 1b |
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| 97 | st %o5, [%o0 - 4] |
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| 98 | retl |
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| 99 | mov %g2, %o0 |
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| 100 | 3: srl %o5, 16, %o5 |
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| 101 | sth %o5, [%o0 - 4] |
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| 102 | stb %g0, [%o0 - 2] |
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| 103 | retl |
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| 104 | mov %g2, %o0 |
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| 105 | 2: srl %o5, 16, %o5 |
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| 106 | sth %o5, [%o0 - 4] |
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| 107 | retl |
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| 108 | mov %g2, %o0 |
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| 109 | 1: stb %g0, [%o0 - 4] |
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| 110 | retl |
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| 111 | mov %g2, %o0 |
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| 112 | |
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| 113 | 10: ld [%o1], %o5 |
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| 114 | add %o1, 4, %o1 |
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| 115 | sub %o5, %o2, %o4 |
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| 116 | cmp %g3, 2 |
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| 117 | be 2f |
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| 118 | cmp %g3, 3 |
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| 119 | be 3f |
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| 120 | andcc %o4, %o3, %g0 |
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| 121 | bne 5f |
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| 122 | srl %o5, 24, %g5 |
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| 123 | stb %g5, [%o0] |
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| 124 | sub %o0, 1, %o0 |
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| 125 | srl %o5, 8, %g5 |
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| 126 | sth %g5, [%o0 + 2] |
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| 127 | 1: add %o0, 4, %o0 |
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| 128 | 4: sll %o5, 24, %g6 |
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| 129 | ld [%o1], %o5 |
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| 130 | add %o1, 4, %o1 |
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| 131 | srl %o5, 8, %g5 |
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| 132 | sub %o5, %o2, %o4 |
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| 133 | or %g5, %g6, %g5 |
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| 134 | andcc %o4, %o3, %g0 |
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| 135 | be,a 1b |
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| 136 | st %g5, [%o0] |
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| 137 | srl %o5, 24, %o4 |
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| 138 | andcc %o4, 0xff, %g0 |
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| 139 | be 6f |
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| 140 | srl %o5, 16, %o4 |
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| 141 | andcc %o4, 0xff, %g0 |
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| 142 | be 7f |
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| 143 | srl %o5, 8, %o4 |
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| 144 | st %g5, [%o0] |
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| 145 | andcc %o4, 0xff, %g0 |
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| 146 | be 0f |
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| 147 | andcc %o5, 0xff, %g0 |
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| 148 | 1: bne 4b |
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| 149 | add %o0, 4, %o0 |
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| 150 | 9: stb %g0, [%o0] |
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| 151 | 0: retl |
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| 152 | mov %g2, %o0 |
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| 153 | 6: srl %g5, 16, %g5 |
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| 154 | sth %g5, [%o0] |
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| 155 | retl |
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| 156 | mov %g2, %o0 |
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| 157 | 7: srl %g5, 16, %g5 |
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| 158 | sth %g5, [%o0] |
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| 159 | stb %g0, [%o0 + 2] |
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| 160 | retl |
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| 161 | mov %g2, %o0 |
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| 162 | 5: andcc %g5, 0xff, %g4 |
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| 163 | be 9b |
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| 164 | srl %o5, 16, %g5 |
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| 165 | andcc %g5, 0xff, %g0 |
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| 166 | be 7f |
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| 167 | srl %o5, 8, %g5 |
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| 168 | andcc %g5, 0xff, %g0 |
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| 169 | stb %g4, [%o0] |
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| 170 | sth %g5, [%o0 + 1] |
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| 171 | sub %o0, 1, %o0 |
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| 172 | bne 1b |
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| 173 | andcc %o5, 0xff, %g0 |
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| 174 | retl |
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| 175 | mov %g2, %o0 |
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| 176 | 7: stb %g4, [%o0] |
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| 177 | stb %g0, [%o0 + 1] |
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| 178 | retl |
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| 179 | mov %g2, %o0 |
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| 180 | |
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| 181 | 2: andcc %o4, %o3, %g0 |
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| 182 | bne 5f |
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| 183 | srl %o5, 16, %g5 |
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| 184 | sth %g5, [%o0] |
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| 185 | sub %o0, 2, %o0 |
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| 186 | 1: add %o0, 4, %o0 |
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| 187 | 4: sll %o5, 16, %g6 |
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| 188 | ld [%o1], %o5 |
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| 189 | add %o1, 4, %o1 |
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| 190 | srl %o5, 16, %g5 |
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| 191 | sub %o5, %o2, %o4 |
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| 192 | or %g5, %g6, %g5 |
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| 193 | andcc %o4, %o3, %g0 |
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| 194 | be,a 1b |
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| 195 | st %g5, [%o0] |
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| 196 | srl %o5, 24, %o4 |
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| 197 | andcc %o4, 0xff, %g0 |
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| 198 | be 7f |
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| 199 | srl %o5, 16, %o4 |
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| 200 | st %g5, [%o0] |
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| 201 | andcc %o4, 0xff, %g0 |
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| 202 | be 0b |
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| 203 | srl %o5, 8, %o4 |
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| 204 | 1: andcc %o4, 0xff, %g0 |
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| 205 | be 8f |
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| 206 | andcc %o5, 0xff, %g0 |
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| 207 | bne 4b |
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| 208 | add %o0, 4, %o0 |
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| 209 | sth %o5, [%o0] |
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| 210 | retl |
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| 211 | mov %g2, %o0 |
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| 212 | 7: srl %g5, 16, %g5 |
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| 213 | sth %g5, [%o0] |
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| 214 | stb %g0, [%o0 + 2] |
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| 215 | retl |
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| 216 | mov %g2, %o0 |
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| 217 | 8: stb %g0, [%o0 + 4] |
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| 218 | retl |
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| 219 | mov %g2, %o0 |
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| 220 | 5: srl %o5, 24, %g5 |
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| 221 | andcc %g5, 0xff, %g0 |
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| 222 | be 9b |
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| 223 | srl %o5, 16, %g5 |
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| 224 | andcc %g5, 0xff, %g0 |
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| 225 | sth %g5, [%o0] |
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| 226 | sub %o0, 2, %o0 |
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| 227 | bne 1b |
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| 228 | srl %o5, 8, %o4 |
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| 229 | retl |
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| 230 | mov %g2, %o0 |
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| 231 | |
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| 232 | 3: bne 5f |
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| 233 | srl %o5, 24, %g5 |
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| 234 | stb %g5, [%o0] |
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| 235 | sub %o0, 3, %o0 |
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| 236 | 1: add %o0, 4, %o0 |
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| 237 | 4: sll %o5, 8, %g6 |
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| 238 | ld [%o1], %o5 |
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| 239 | add %o1, 4, %o1 |
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| 240 | srl %o5, 24, %g5 |
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| 241 | sub %o5, %o2, %o4 |
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| 242 | or %g5, %g6, %g5 |
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| 243 | andcc %o4, %o3, %g0 |
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| 244 | be 1b |
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| 245 | st %g5, [%o0] |
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| 246 | srl %o5, 24, %o4 |
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| 247 | andcc %o4, 0xff, %g0 |
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| 248 | be 0b |
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| 249 | srl %o5, 16, %o4 |
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| 250 | 1: andcc %o4, 0xff, %g0 |
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| 251 | be 8b |
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| 252 | srl %o5, 8, %o4 |
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| 253 | andcc %o4, 0xff, %g0 |
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| 254 | be 9f |
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| 255 | andcc %o5, 0xff, %g0 |
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| 256 | bne 4b |
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| 257 | add %o0, 4, %o0 |
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| 258 | srl %o5, 8, %o5 |
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| 259 | sth %o5, [%o0] |
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| 260 | stb %g0, [%o0 + 2] |
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| 261 | retl |
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| 262 | mov %g2, %o0 |
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| 263 | 9: srl %o5, 8, %o5 |
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| 264 | sth %o5, [%o0 + 4] |
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| 265 | retl |
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| 266 | mov %g2, %o0 |
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| 267 | 5: andcc %g5, 0xff, %g0 |
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| 268 | stb %g5, [%o0] |
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| 269 | sub %o0, 3, %o0 |
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| 270 | bne 1b |
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| 271 | srl %o5, 16, %o4 |
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| 272 | retl |
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| 273 | mov %g2, %o0 |
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| 274 | END(strcpy) |
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| 275 | libc_hidden_builtin_def (strcpy) |
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| 276 | |
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