| 1 | /* strchr (str, ch) -- Return pointer to first occurrence of CH in STR. |
|---|
| 2 | For SPARC v7. |
|---|
| 3 | Copyright (C) 1996-2024 Free Software Foundation, Inc. |
|---|
| 4 | This file is part of the GNU C Library. |
|---|
| 5 | |
|---|
| 6 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 7 | modify it under the terms of the GNU Lesser General Public |
|---|
| 8 | License as published by the Free Software Foundation; either |
|---|
| 9 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 10 | |
|---|
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 14 | Lesser General Public License for more details. |
|---|
| 15 | |
|---|
| 16 | You should have received a copy of the GNU Lesser General Public |
|---|
| 17 | License along with the GNU C Library; if not, see |
|---|
| 18 | <https://www.gnu.org/licenses/>. */ |
|---|
| 19 | |
|---|
| 20 | #include <sysdep.h> |
|---|
| 21 | |
|---|
| 22 | /* Normally, this uses ((xword - 0x01010101) & 0x80808080) test |
|---|
| 23 | to find out if any byte in xword could be zero. This is fast, but |
|---|
| 24 | also gives false alarm for any byte in range 0x81-0xff. It does |
|---|
| 25 | not matter for correctness, as if this test tells us there could |
|---|
| 26 | be some zero byte, we check it byte by byte, but if bytes with |
|---|
| 27 | high bits set are common in the strings, then this will give poor |
|---|
| 28 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm |
|---|
| 29 | will use one tick slower, but more precise test |
|---|
| 30 | ((xword - 0x01010101) & (~xword) & 0x80808080), |
|---|
| 31 | which does not give any false alarms (but if some bits are set, |
|---|
| 32 | one cannot assume from it which bytes are zero and which are not). |
|---|
| 33 | It is yet to be measured, what is the correct default for glibc |
|---|
| 34 | in these days for an average user. |
|---|
| 35 | */ |
|---|
| 36 | |
|---|
| 37 | .text |
|---|
| 38 | .align 4 |
|---|
| 39 | ENTRY(strchr) |
|---|
| 40 | andcc %o1, 0xff, %o1 |
|---|
| 41 | be 12f |
|---|
| 42 | sll %o1, 8, %o2 |
|---|
| 43 | andcc %o0, 3, %g0 |
|---|
| 44 | or %o1, %o2, %o2 |
|---|
| 45 | sethi %hi(0x80808080), %o4 |
|---|
| 46 | sll %o2, 16, %o3 |
|---|
| 47 | be 13f |
|---|
| 48 | or %o3, %o2, %g2 |
|---|
| 49 | |
|---|
| 50 | ldub [%o0], %g4 |
|---|
| 51 | cmp %g4, %o1 |
|---|
| 52 | be 11f |
|---|
| 53 | add %o0, 1, %o0 |
|---|
| 54 | cmp %g4, 0 |
|---|
| 55 | be 9f |
|---|
| 56 | andcc %o0, 3, %g0 |
|---|
| 57 | be 4f |
|---|
| 58 | or %o4, %lo(0x80808080), %o3 |
|---|
| 59 | ldub [%o0], %g4 |
|---|
| 60 | cmp %g4, %o1 |
|---|
| 61 | be 11f |
|---|
| 62 | add %o0, 1, %o0 |
|---|
| 63 | cmp %g4, 0 |
|---|
| 64 | be 9f |
|---|
| 65 | andcc %o0, 3, %g0 |
|---|
| 66 | be 5f |
|---|
| 67 | sethi %hi(0x01010101), %o5 |
|---|
| 68 | ldub [%o0], %g4 |
|---|
| 69 | cmp %g4, %o1 |
|---|
| 70 | be 11f |
|---|
| 71 | add %o0, 1, %o0 |
|---|
| 72 | cmp %g4, 0 |
|---|
| 73 | be 9f |
|---|
| 74 | or %o5, %lo(0x01010101), %o2 |
|---|
| 75 | b 6f |
|---|
| 76 | ld [%o0], %g4 |
|---|
| 77 | 11: retl |
|---|
| 78 | sub %o0, 1, %o0 |
|---|
| 79 | |
|---|
| 80 | 13: or %o4, %lo(0x80808080), %o3 |
|---|
| 81 | 4: sethi %hi(0x01010101), %o5 |
|---|
| 82 | 5: or %o5, %lo(0x01010101), %o2 |
|---|
| 83 | 7: ld [%o0], %g4 |
|---|
| 84 | 6: xor %g4, %g2, %g5 |
|---|
| 85 | sub %g4, %o2, %o4 |
|---|
| 86 | #ifdef EIGHTBIT_NOT_RARE |
|---|
| 87 | sub %g5, %o2, %g6 |
|---|
| 88 | andn %o4, %g4, %o4 |
|---|
| 89 | andn %g6, %g5, %g5 |
|---|
| 90 | #else |
|---|
| 91 | sub %g5, %o2, %g5 |
|---|
| 92 | #endif |
|---|
| 93 | or %g5, %o4, %o4 |
|---|
| 94 | andcc %o4, %o3, %g0 |
|---|
| 95 | be 7b |
|---|
| 96 | add %o0, 4, %o0 |
|---|
| 97 | |
|---|
| 98 | /* Check every byte. */ |
|---|
| 99 | 8: srl %g4, 24, %g5 |
|---|
| 100 | 7: andcc %g5, 0xff, %g5 |
|---|
| 101 | be 9f |
|---|
| 102 | cmp %g5, %o1 |
|---|
| 103 | be 4f |
|---|
| 104 | srl %g4, 16, %g5 |
|---|
| 105 | andcc %g5, 0xff, %g5 |
|---|
| 106 | be 9f |
|---|
| 107 | cmp %g5, %o1 |
|---|
| 108 | be 3f |
|---|
| 109 | srl %g4, 8, %g5 |
|---|
| 110 | andcc %g5, 0xff, %g5 |
|---|
| 111 | be 9f |
|---|
| 112 | cmp %g5, %o1 |
|---|
| 113 | be 2f |
|---|
| 114 | andcc %g4, 0xff, %g5 |
|---|
| 115 | be 9f |
|---|
| 116 | cmp %g5, %o1 |
|---|
| 117 | bne,a 6b |
|---|
| 118 | ld [%o0], %g4 |
|---|
| 119 | retl |
|---|
| 120 | sub %o0, 1, %o0 |
|---|
| 121 | 2: retl |
|---|
| 122 | sub %o0, 2, %o0 |
|---|
| 123 | 3: retl |
|---|
| 124 | sub %o0, 3, %o0 |
|---|
| 125 | 4: retl |
|---|
| 126 | sub %o0, 4, %o0 |
|---|
| 127 | 9: retl |
|---|
| 128 | clr %o0 |
|---|
| 129 | |
|---|
| 130 | 11: ldub [%o0], %o5 |
|---|
| 131 | cmp %o5, 0 |
|---|
| 132 | be 1f |
|---|
| 133 | add %o0, 1, %o0 |
|---|
| 134 | andcc %o0, 3, %g0 |
|---|
| 135 | be 4f |
|---|
| 136 | or %o4, %lo(0x80808080), %o3 |
|---|
| 137 | ldub [%o0], %o5 |
|---|
| 138 | cmp %o5, 0 |
|---|
| 139 | be 1f |
|---|
| 140 | add %o0, 1, %o0 |
|---|
| 141 | andcc %o0, 3, %g0 |
|---|
| 142 | be 5f |
|---|
| 143 | sethi %hi(0x01010101), %o4 |
|---|
| 144 | ldub [%o0], %o5 |
|---|
| 145 | cmp %o5, 0 |
|---|
| 146 | be 1f |
|---|
| 147 | add %o0, 1, %o0 |
|---|
| 148 | b 6f |
|---|
| 149 | or %o4, %lo(0x01010101), %o2 |
|---|
| 150 | 1: retl |
|---|
| 151 | sub %o0, 1, %o0 |
|---|
| 152 | |
|---|
| 153 | 12: andcc %o0, 3, %g0 |
|---|
| 154 | bne 11b |
|---|
| 155 | sethi %hi(0x80808080), %o4 |
|---|
| 156 | or %o4, %lo(0x80808080), %o3 |
|---|
| 157 | 4: sethi %hi(0x01010101), %o4 |
|---|
| 158 | 5: or %o4, %lo(0x01010101), %o2 |
|---|
| 159 | 6: ld [%o0], %o5 |
|---|
| 160 | 7: sub %o5, %o2, %o4 |
|---|
| 161 | #ifdef EIGHTBIT_NOT_RARE |
|---|
| 162 | andn %o4, %o5, %o4 |
|---|
| 163 | #endif |
|---|
| 164 | andcc %o4, %o3, %g0 |
|---|
| 165 | be 6b |
|---|
| 166 | add %o0, 4, %o0 |
|---|
| 167 | |
|---|
| 168 | /* Check every byte. */ |
|---|
| 169 | srl %o5, 24, %g5 |
|---|
| 170 | andcc %g5, 0xff, %g0 |
|---|
| 171 | be 8f |
|---|
| 172 | add %o0, -4, %o4 |
|---|
| 173 | srl %o5, 16, %g5 |
|---|
| 174 | andcc %g5, 0xff, %g0 |
|---|
| 175 | be 8f |
|---|
| 176 | add %o4, 1, %o4 |
|---|
| 177 | srl %o5, 8, %g5 |
|---|
| 178 | andcc %g5, 0xff, %g0 |
|---|
| 179 | be 8f |
|---|
| 180 | add %o4, 1, %o4 |
|---|
| 181 | andcc %o5, 0xff, %g0 |
|---|
| 182 | bne,a 7b |
|---|
| 183 | ld [%o0], %o5 |
|---|
| 184 | add %o4, 1, %o4 |
|---|
| 185 | 8: retl |
|---|
| 186 | mov %o4, %o0 |
|---|
| 187 | |
|---|
| 188 | 13: ldub [%o0], %g4 |
|---|
| 189 | cmp %g4, %o1 |
|---|
| 190 | add %o0, 1, %o0 |
|---|
| 191 | be,a 1f |
|---|
| 192 | sub %o0, 1, %o5 |
|---|
| 193 | cmp %g4, 0 |
|---|
| 194 | be 9f |
|---|
| 195 | 1: andcc %o0, 3, %g0 |
|---|
| 196 | be 4f |
|---|
| 197 | or %o4, %lo(0x80808080), %o3 |
|---|
| 198 | ldub [%o0], %g4 |
|---|
| 199 | cmp %g4, %o1 |
|---|
| 200 | add %o0, 1, %o0 |
|---|
| 201 | be,a 1f |
|---|
| 202 | sub %o0, 1, %o5 |
|---|
| 203 | cmp %g4, 0 |
|---|
| 204 | be 9f |
|---|
| 205 | 1: andcc %o0, 3, %g0 |
|---|
| 206 | be 5f |
|---|
| 207 | sethi %hi(0x01010101), %o4 |
|---|
| 208 | ldub [%o0], %g4 |
|---|
| 209 | cmp %g4, %o1 |
|---|
| 210 | add %o0, 1, %o0 |
|---|
| 211 | be,a 1f |
|---|
| 212 | sub %o0, 1, %o5 |
|---|
| 213 | cmp %g4, 0 |
|---|
| 214 | be 9f |
|---|
| 215 | 1: or %o4, %lo(0x01010101), %o2 |
|---|
| 216 | b 7f |
|---|
| 217 | ld [%o0], %g4 |
|---|
| 218 | END(strchr) |
|---|
| 219 | |
|---|
| 220 | ENTRY(strrchr) |
|---|
| 221 | andcc %o1, 0xff, %o1 |
|---|
| 222 | clr %o5 |
|---|
| 223 | be 12b |
|---|
| 224 | sll %o1, 8, %o2 |
|---|
| 225 | andcc %o0, 3, %g0 |
|---|
| 226 | or %o1, %o2, %o2 |
|---|
| 227 | sethi %hi(0x80808080), %o4 |
|---|
| 228 | sll %o2, 16, %o3 |
|---|
| 229 | bne 13b |
|---|
| 230 | or %o3, %o2, %g2 |
|---|
| 231 | or %o4, %lo(0x80808080), %o3 |
|---|
| 232 | 4: sethi %hi(0x01010101), %o4 |
|---|
| 233 | 5: or %o4, %lo(0x01010101), %o2 |
|---|
| 234 | 6: ld [%o0], %g4 |
|---|
| 235 | 7: xor %g4, %g2, %g5 |
|---|
| 236 | sub %g4, %o2, %o4 |
|---|
| 237 | #ifdef EIGHTBIT_NOT_RARE |
|---|
| 238 | sub %g5, %o2, %g6 |
|---|
| 239 | andn %o4, %g4, %o4 |
|---|
| 240 | andn %g6, %g5, %g5 |
|---|
| 241 | #else |
|---|
| 242 | sub %g5, %o2, %g5 |
|---|
| 243 | #endif |
|---|
| 244 | or %g5, %o4, %o4 |
|---|
| 245 | andcc %o4, %o3, %g0 |
|---|
| 246 | be 6b |
|---|
| 247 | add %o0, 4, %o0 |
|---|
| 248 | |
|---|
| 249 | /* Check every byte. */ |
|---|
| 250 | 3: srl %g4, 24, %g5 |
|---|
| 251 | 8: andcc %g5, 0xff, %g5 |
|---|
| 252 | be 9f |
|---|
| 253 | cmp %g5, %o1 |
|---|
| 254 | be,a 1f |
|---|
| 255 | sub %o0, 4, %o5 |
|---|
| 256 | 1: srl %g4, 16, %g5 |
|---|
| 257 | andcc %g5, 0xff, %g5 |
|---|
| 258 | be 9f |
|---|
| 259 | cmp %g5, %o1 |
|---|
| 260 | be,a 1f |
|---|
| 261 | sub %o0, 3, %o5 |
|---|
| 262 | 1: srl %g4, 8, %g5 |
|---|
| 263 | andcc %g5, 0xff, %g5 |
|---|
| 264 | be 9f |
|---|
| 265 | cmp %g5, %o1 |
|---|
| 266 | be,a 1f |
|---|
| 267 | sub %o0, 2, %o5 |
|---|
| 268 | 1: andcc %g4, 0xff, %g5 |
|---|
| 269 | be 9f |
|---|
| 270 | cmp %g5, %o1 |
|---|
| 271 | be,a 1f |
|---|
| 272 | sub %o0, 1, %o5 |
|---|
| 273 | 1: b 7b |
|---|
| 274 | ld [%o0], %g4 |
|---|
| 275 | 9: retl |
|---|
| 276 | mov %o5, %o0 |
|---|
| 277 | END(strrchr) |
|---|
| 278 | |
|---|
| 279 | weak_alias (strchr, index) |
|---|
| 280 | weak_alias (strrchr, rindex) |
|---|
| 281 | libc_hidden_builtin_def (strchr) |
|---|
| 282 | libc_hidden_builtin_def (strrchr) |
|---|
| 283 | |
|---|
