projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ae6b8730 RH |
1 | /* Copy SRC to DEST returning the address of the terminating '\0' in DEST. |
| 2 | For SPARC v7. | |
| d4697bc9 | 3 | Copyright (C) 1996-2014 Free Software Foundation, Inc. |
| ae6b8730 RH |
4 | This file is part of the GNU C Library. |
| 5 | Contributed by Jakub Jelinek <jj@ultra.linux.cz>. | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either | |
| 10 | version 2.1 of the License, or (at your option) any later version. | |
| ae6b8730 RH |
11 | |
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 15 | Lesser General Public License for more details. |
| ae6b8730 | 16 | |
| 41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
| 19 | <http://www.gnu.org/licenses/>. */ | |
| ae6b8730 RH |
20 | |
| 21 | #include <sysdep.h> | |
| 22 | ||
| 23 | /* Normally, this uses ((xword - 0x01010101) & 0x80808080) test | |
| 24 | to find out if any byte in xword could be zero. This is fast, but | |
| 25 | also gives false alarm for any byte in range 0x81-0xff. It does | |
| 26 | not matter for correctness, as if this test tells us there could | |
| 27 | be some zero byte, we check it byte by byte, but if bytes with | |
| 28 | high bits set are common in the strings, then this will give poor | |
| 29 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm | |
| 30 | will use one tick slower, but more precise test | |
| 31 | ((xword - 0x01010101) & (~xword) & 0x80808080), | |
| 32 | which does not give any false alarms (but if some bits are set, | |
| 33 | one cannot assume from it which bytes are zero and which are not). | |
| 34 | It is yet to be measured, what is the correct default for glibc | |
| 35 | in these days for an average user. | |
| 36 | */ | |
| 37 | ||
| 38 | .text | |
| 39 | .align 4 | |
| 043cee37 RM |
40 | |
| 41 | ENTRY(__stpcpy) | |
| 42 | andcc %o1, 3, %g0 | |
| 43 | be 20f | |
| 44 | sethi %hi(0x80808080), %o4 | |
| 45 | ||
| 46 | ldub [%o1], %o5 | |
| ae6b8730 RH |
47 | stb %o5, [%o0] |
| 48 | cmp %o5, 0 | |
| 49 | add %o0, 1, %o0 | |
| 50 | be 1f | |
| 51 | add %o1, 1, %o1 | |
| 52 | andcc %o1, 3, %g0 | |
| 53 | be 4f | |
| 54 | or %o4, %lo(0x80808080), %o3 | |
| 55 | ldub [%o1], %o5 | |
| 56 | stb %o5, [%o0] | |
| 57 | cmp %o5, 0 | |
| 58 | add %o0, 1, %o0 | |
| 59 | be 1f | |
| 60 | add %o1, 1, %o1 | |
| 61 | andcc %o1, 3, %g0 | |
| 62 | be 5f | |
| 63 | sethi %hi(0x01010101), %o4 | |
| 64 | ldub [%o1], %o5 | |
| 65 | stb %o5, [%o0] | |
| 66 | cmp %o5, 0 | |
| 67 | add %o0, 1, %o0 | |
| 68 | be 1f | |
| 69 | add %o1, 1, %o1 | |
| 70 | b 6f | |
| 71 | or %o4, %lo(0x01010101), %o2 | |
| 72 | 1: retl | |
| 73 | add %o0, -1, %o0 | |
| 74 | ||
| 043cee37 | 75 | 20: or %o4, %lo(0x80808080), %o3 |
| ae6b8730 RH |
76 | 4: sethi %hi(0x01010101), %o4 |
| 77 | 5: or %o4, %lo(0x01010101), %o2 | |
| 78 | 6: andcc %o0, 3, %g0 | |
| 79 | bne 16f | |
| 80 | sub %g0, 4, %g1 | |
| 6111cd0e | 81 | |
| ae6b8730 RH |
82 | 11: add %g1, 4, %g1 |
| 83 | ld [%o1 + %g1], %o5 | |
| 84 | sub %o5, %o2, %o4 | |
| 85 | #ifdef EIGHTBIT_NOT_RARE | |
| 86 | andn %o4, %o5, %o4 | |
| 87 | #endif | |
| 88 | andcc %o4, %o3, %g0 | |
| 89 | be,a 11b | |
| 90 | st %o5, [%o0 + %g1] | |
| 91 | ||
| 92 | /* Check every byte. */ | |
| 93 | srl %o5, 24, %g5 | |
| 94 | andcc %g5, 0xff, %g0 | |
| 95 | be 14f | |
| 96 | srl %o5, 16, %g5 | |
| 97 | andcc %g5, 0xff, %g0 | |
| 98 | be 13f | |
| 99 | srl %o5, 8, %g5 | |
| 100 | andcc %g5, 0xff, %g0 | |
| 101 | be 12f | |
| 102 | andcc %o5, 0xff, %g0 | |
| 103 | bne 11b | |
| 104 | st %o5, [%o0 + %g1] | |
| 105 | add %o0, %g1, %o0 | |
| 106 | retl | |
| 107 | add %o0, 3, %o0 | |
| 108 | 12: srl %o5, 16, %o5 | |
| 109 | sth %o5, [%o0 + %g1] | |
| 110 | add %g1, 2, %g1 | |
| 111 | stb %g0, [%o0 + %g1] | |
| 112 | retl | |
| 113 | add %o0, %g1, %o0 | |
| 114 | 13: srl %o5, 16, %o5 | |
| 115 | sth %o5, [%o0 + %g1] | |
| 116 | add %g1, 1, %g1 | |
| 117 | retl | |
| 118 | add %o0, %g1, %o0 | |
| 119 | 14: stb %g0, [%o0 + %g1] | |
| 120 | retl | |
| 121 | add %o0, %g1, %o0 | |
| 122 | ||
| 123 | 15: srl %o5, 24, %o4 | |
| 124 | srl %o5, 16, %g1 | |
| 125 | stb %o4, [%o0] | |
| 126 | srl %o5, 8, %g4 | |
| 127 | stb %g1, [%o0 + 1] | |
| 128 | stb %g4, [%o0 + 2] | |
| 129 | stb %o5, [%o0 + 3] | |
| 130 | add %o0, 4, %o0 | |
| 131 | 16: ld [%o1], %o5 | |
| 132 | sub %o5, %o2, %o4 | |
| 133 | andcc %o4, %o3, %g0 | |
| 134 | be 15b | |
| 135 | add %o1, 4, %o1 | |
| 136 | ||
| 137 | /* Check every byte. */ | |
| 138 | srl %o5, 24, %g5 | |
| 139 | andcc %g5, 0xff, %g4 | |
| 140 | be 19f | |
| 141 | stb %g4, [%o0] | |
| 142 | srl %o5, 16, %g5 | |
| 143 | andcc %g5, 0xff, %g4 | |
| 144 | be 18f | |
| 145 | stb %g4, [%o0 + 1] | |
| 146 | srl %o5, 8, %g5 | |
| 147 | andcc %g5, 0xff, %g4 | |
| 148 | be 17f | |
| 149 | stb %g4, [%o0 + 2] | |
| 150 | andcc %o5, 0xff, %g4 | |
| 151 | stb %g4, [%o0 + 3] | |
| 152 | bne 16b | |
| 153 | add %o0, 4, %o0 | |
| 154 | retl | |
| 155 | sub %o0, 1, %o0 | |
| 156 | 17: retl | |
| 157 | add %o0, 2, %o0 | |
| 158 | 18: retl | |
| 159 | add %o0, 1, %o0 | |
| 160 | 19: retl | |
| 161 | nop | |
| 162 | END(__stpcpy) | |
| 163 | ||
| 1ab18a5b | 164 | weak_alias (__stpcpy, stpcpy) |
| 6111cd0e | 165 | libc_hidden_def (__stpcpy) |
| 3dbfd811 | 166 | libc_hidden_builtin_def (stpcpy) |