| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* strcat (dest, src) -- Append SRC on the end of DEST. |
| 2 | For SPARC v9. |
| 3 | Copyright (C) 1998, 1999, 2003 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | Contributed by Jakub Jelinek <jj@ultra.linux.cz> and |
| 6 | Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz>. |
| 7 | |
| 8 | The GNU C Library is free software; you can redistribute it and/or |
| 9 | modify it under the terms of the GNU Lesser General Public |
| 10 | License as published by the Free Software Foundation; either |
| 11 | version 2.1 of the License, or (at your option) any later version. |
| 12 | |
| 13 | The GNU C Library is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | Lesser General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU Lesser General Public |
| 19 | License along with the GNU C Library; if not, write to the Free |
| 20 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 21 | 02111-1307 USA. */ |
| 22 | |
| 23 | #include <asm/asi.h> |
| 24 | #ifndef XCC |
| 25 | #define XCC xcc |
| 26 | #define USE_BPR |
| 27 | .register %g2, #scratch |
| 28 | .register %g3, #scratch |
| 29 | .register %g6, #scratch |
| 30 | #endif |
| 31 | |
| 32 | /* Normally, this uses |
| 33 | ((xword - 0x0101010101010101) & 0x8080808080808080) test |
| 34 | to find out if any byte in xword could be zero. This is fast, but |
| 35 | also gives false alarm for any byte in range 0x81-0xff. It does |
| 36 | not matter for correctness, as if this test tells us there could |
| 37 | be some zero byte, we check it byte by byte, but if bytes with |
| 38 | high bits set are common in the strings, then this will give poor |
| 39 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm |
| 40 | will use one tick slower, but more precise test |
| 41 | ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080), |
| 42 | which does not give any false alarms (but if some bits are set, |
| 43 | one cannot assume from it which bytes are zero and which are not). |
| 44 | It is yet to be measured, what is the correct default for glibc |
| 45 | in these days for an average user. |
| 46 | */ |
| 47 | |
| 48 | .text |
| 49 | .align 32 |
| 50 | ENTRY(strcat) |
| 51 | sethi %hi(0x01010101), %g1 /* IEU0 Group */ |
| 52 | ldub [%o0], %o3 /* Load */ |
| 53 | or %g1, %lo(0x01010101), %g1 /* IEU0 Group */ |
| 54 | mov %o0, %g6 /* IEU1 */ |
| 55 | |
| 56 | sllx %g1, 32, %g2 /* IEU0 Group */ |
| 57 | andcc %o0, 7, %g0 /* IEU1 */ |
| 58 | or %g1, %g2, %g1 /* IEU0 Group */ |
| 59 | bne,pn %icc, 32f /* CTI */ |
| 60 | |
| 61 | sllx %g1, 7, %g2 /* IEU0 Group */ |
| 62 | brz,pn %o3, 30f /* CTI+IEU1 */ |
| 63 | ldx [%o0], %o3 /* Load */ |
| 64 | 48: add %o0, 8, %o0 /* IEU0 Group */ |
| 65 | |
| 66 | 49: sub %o3, %g1, %o2 /* IEU0 Group */ |
| 67 | #ifdef EIGHTBIT_NOT_RARE |
| 68 | andn %o2, %o3, %g5 /* IEU0 Group */ |
| 69 | ldxa [%o0] ASI_PNF, %o3 /* Load */ |
| 70 | andcc %g5, %g2, %g0 /* IEU1 Group */ |
| 71 | #else |
| 72 | ldxa [%o0] ASI_PNF, %o3 /* Load */ |
| 73 | andcc %o2, %g2, %g0 /* IEU1 Group */ |
| 74 | #endif |
| 75 | be,pt %xcc, 49b /* CTI */ |
| 76 | |
| 77 | add %o0, 8, %o0 /* IEU0 */ |
| 78 | addcc %o2, %g1, %g3 /* IEU1 Group */ |
| 79 | srlx %o2, 32, %o2 /* IEU0 */ |
| 80 | 50: andcc %o2, %g2, %g0 /* IEU1 Group */ |
| 81 | |
| 82 | be,pn %xcc, 51f /* CTI */ |
| 83 | srlx %g3, 56, %o2 /* IEU0 */ |
| 84 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 85 | be,pn %icc, 29f /* CTI */ |
| 86 | |
| 87 | srlx %g3, 48, %o2 /* IEU0 */ |
| 88 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 89 | be,pn %icc, 28f /* CTI */ |
| 90 | srlx %g3, 40, %o2 /* IEU0 */ |
| 91 | |
| 92 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 93 | be,pn %icc, 27f /* CTI */ |
| 94 | srlx %g3, 32, %o2 /* IEU0 */ |
| 95 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 96 | |
| 97 | be,pn %icc, 26f /* CTI */ |
| 98 | 51: srlx %g3, 24, %o2 /* IEU0 */ |
| 99 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 100 | be,pn %icc, 25f /* CTI */ |
| 101 | |
| 102 | srlx %g3, 16, %o2 /* IEU0 */ |
| 103 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 104 | be,pn %icc, 24f /* CTI */ |
| 105 | srlx %g3, 8, %o2 /* IEU0 */ |
| 106 | |
| 107 | andcc %o2, 0xff, %g0 /* IEU1 Group */ |
| 108 | be,pn %icc, 23f /* CTI */ |
| 109 | sub %o3, %g1, %o2 /* IEU0 */ |
| 110 | andcc %g3, 0xff, %g0 /* IEU1 Group */ |
| 111 | |
| 112 | be,pn %icc, 52f /* CTI */ |
| 113 | ldxa [%o0] ASI_PNF, %o3 /* Load */ |
| 114 | andcc %o2, %g2, %g0 /* IEU1 Group */ |
| 115 | be,pt %xcc, 49b /* CTI */ |
| 116 | |
| 117 | add %o0, 8, %o0 /* IEU0 */ |
| 118 | addcc %o2, %g1, %g3 /* IEU1 Group */ |
| 119 | ba,pt %xcc, 50b /* CTI */ |
| 120 | srlx %o2, 32, %o2 /* IEU0 */ |
| 121 | |
| 122 | .align 16 |
| 123 | 52: ba,pt %xcc, 12f /* CTI Group */ |
| 124 | add %o0, -9, %o0 /* IEU0 */ |
| 125 | 23: ba,pt %xcc, 12f /* CTI Group */ |
| 126 | add %o0, -10, %o0 /* IEU0 */ |
| 127 | |
| 128 | 24: ba,pt %xcc, 12f /* CTI Group */ |
| 129 | add %o0, -11, %o0 /* IEU0 */ |
| 130 | 25: ba,pt %xcc, 12f /* CTI Group */ |
| 131 | add %o0, -12, %o0 /* IEU0 */ |
| 132 | |
| 133 | 26: ba,pt %xcc, 12f /* CTI Group */ |
| 134 | add %o0, -13, %o0 /* IEU0 */ |
| 135 | 27: ba,pt %xcc, 12f /* CTI Group */ |
| 136 | add %o0, -14, %o0 /* IEU0 */ |
| 137 | |
| 138 | 28: ba,pt %xcc, 12f /* CTI Group */ |
| 139 | add %o0, -15, %o0 /* IEU0 */ |
| 140 | 29: add %o0, -16, %o0 /* IEU0 Group */ |
| 141 | 30: andcc %o1, 7, %g3 /* IEU1 */ |
| 142 | |
| 143 | 31: bne,pn %icc, 14f /* CTI */ |
| 144 | orcc %g0, 64, %g4 /* IEU1 Group */ |
| 145 | 1: ldx [%o1], %o3 /* Load */ |
| 146 | add %o1, 8, %o1 /* IEU1 */ |
| 147 | |
| 148 | 2: mov %o3, %g3 /* IEU0 Group */ |
| 149 | 3: sub %o3, %g1, %o2 /* IEU1 */ |
| 150 | ldxa [%o1] ASI_PNF, %o3 /* Load */ |
| 151 | #ifdef EIGHTBIT_NOT_RARE |
| 152 | andn %o2, %g3, %o2 /* IEU0 Group */ |
| 153 | #endif |
| 154 | add %o0, 8, %o0 /* IEU0 Group */ |
| 155 | |
| 156 | andcc %o2, %g2, %g0 /* IEU1 */ |
| 157 | add %o1, 8, %o1 /* IEU0 Group */ |
| 158 | be,a,pt %xcc, 2b /* CTI */ |
| 159 | stx %g3, [%o0 - 8] /* Store */ |
| 160 | |
| 161 | srlx %g3, 56, %g5 /* IEU0 Group */ |
| 162 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 163 | be,pn %icc, 11f /* CTI */ |
| 164 | srlx %g3, 48, %g4 /* IEU0 */ |
| 165 | |
| 166 | andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| 167 | be,pn %icc, 10f /* CTI */ |
| 168 | srlx %g3, 40, %g5 /* IEU0 */ |
| 169 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 170 | |
| 171 | be,pn %icc, 9f /* CTI */ |
| 172 | srlx %g3, 32, %g4 /* IEU0 */ |
| 173 | andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| 174 | be,pn %icc, 8f /* CTI */ |
| 175 | |
| 176 | srlx %g3, 24, %g5 /* IEU0 */ |
| 177 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 178 | be,pn %icc, 7f /* CTI */ |
| 179 | srlx %g3, 16, %g4 /* IEU0 */ |
| 180 | |
| 181 | andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| 182 | be,pn %icc, 6f /* CTI */ |
| 183 | srlx %g3, 8, %g5 /* IEU0 */ |
| 184 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 185 | |
| 186 | be,pn %icc, 5f /* CTI */ |
| 187 | sub %o3, %g1, %o2 /* IEU0 */ |
| 188 | stx %g3, [%o0 - 8] /* Store Group */ |
| 189 | andcc %g3, 0xff, %g0 /* IEU1 */ |
| 190 | |
| 191 | bne,pt %icc, 3b /* CTI */ |
| 192 | mov %o3, %g3 /* IEU0 Group */ |
| 193 | 4: retl /* CTI+IEU1 Group */ |
| 194 | mov %g6, %o0 /* IEU0 */ |
| 195 | |
| 196 | .align 16 |
| 197 | 5: stb %g5, [%o0 - 2] /* Store Group */ |
| 198 | srlx %g3, 16, %g4 /* IEU0 */ |
| 199 | 6: sth %g4, [%o0 - 4] /* Store Group */ |
| 200 | srlx %g3, 32, %g4 /* IEU0 */ |
| 201 | |
| 202 | stw %g4, [%o0 - 8] /* Store Group */ |
| 203 | retl /* CTI+IEU1 Group */ |
| 204 | mov %g6, %o0 /* IEU0 */ |
| 205 | 7: stb %g5, [%o0 - 4] /* Store Group */ |
| 206 | |
| 207 | srlx %g3, 32, %g4 /* IEU0 */ |
| 208 | 8: stw %g4, [%o0 - 8] /* Store Group */ |
| 209 | retl /* CTI+IEU1 Group */ |
| 210 | mov %g6, %o0 /* IEU0 */ |
| 211 | |
| 212 | 9: stb %g5, [%o0 - 6] /* Store Group */ |
| 213 | srlx %g3, 48, %g4 /* IEU0 */ |
| 214 | 10: sth %g4, [%o0 - 8] /* Store Group */ |
| 215 | retl /* CTI+IEU1 Group */ |
| 216 | |
| 217 | mov %g6, %o0 /* IEU0 */ |
| 218 | 11: stb %g5, [%o0 - 8] /* Store Group */ |
| 219 | retl /* CTI+IEU1 Group */ |
| 220 | mov %g6, %o0 /* IEU0 */ |
| 221 | |
| 222 | .align 16 |
| 223 | 32: andcc %o0, 7, %g0 /* IEU1 Group */ |
| 224 | be,a,pn %icc, 48b /* CTI */ |
| 225 | ldx [%o0], %o3 /* Load */ |
| 226 | add %o0, 1, %o0 /* IEU0 Group */ |
| 227 | |
| 228 | brnz,a,pt %o3, 32b /* CTI+IEU1 */ |
| 229 | lduba [%o0] ASI_PNF, %o3 /* Load */ |
| 230 | add %o0, -1, %o0 /* IEU0 Group */ |
| 231 | andcc %o0, 7, %g0 /* IEU1 Group */ |
| 232 | |
| 233 | be,a,pn %icc, 31b /* CTI */ |
| 234 | andcc %o1, 7, %g3 /* IEU1 Group */ |
| 235 | 12: ldub [%o1], %o3 /* Load */ |
| 236 | stb %o3, [%o0] /* Store Group */ |
| 237 | |
| 238 | 13: add %o0, 1, %o0 /* IEU0 */ |
| 239 | add %o1, 1, %o1 /* IEU1 */ |
| 240 | andcc %o3, 0xff, %g0 /* IEU1 Group */ |
| 241 | be,pn %icc, 4b /* CTI */ |
| 242 | |
| 243 | lduba [%o1] ASI_PNF, %o3 /* Load */ |
| 244 | andcc %o0, 7, %g0 /* IEU1 Group */ |
| 245 | bne,a,pt %icc, 13b /* CTI */ |
| 246 | stb %o3, [%o0] /* Store */ |
| 247 | |
| 248 | andcc %o1, 7, %g3 /* IEU1 Group */ |
| 249 | be,a,pt %icc, 1b /* CTI */ |
| 250 | ldx [%o1], %o3 /* Load */ |
| 251 | orcc %g0, 64, %g4 /* IEU1 Group */ |
| 252 | |
| 253 | 14: sllx %g3, 3, %g5 /* IEU0 */ |
| 254 | sub %o1, %g3, %o1 /* IEU0 Group */ |
| 255 | sub %g4, %g5, %g4 /* IEU1 */ |
| 256 | /* %g1 = 0101010101010101 * |
| 257 | * %g2 = 8080808080808080 * |
| 258 | * %g3 = source alignment * |
| 259 | * %g5 = number of bits to shift left * |
| 260 | * %g4 = number of bits to shift right */ |
| 261 | ldxa [%o1] ASI_PNF, %o5 /* Load Group */ |
| 262 | |
| 263 | addcc %o1, 8, %o1 /* IEU1 */ |
| 264 | 15: sllx %o5, %g5, %o3 /* IEU0 Group */ |
| 265 | ldxa [%o1] ASI_PNF, %o5 /* Load */ |
| 266 | srlx %o5, %g4, %o4 /* IEU0 Group */ |
| 267 | |
| 268 | add %o0, 8, %o0 /* IEU1 */ |
| 269 | or %o3, %o4, %o3 /* IEU0 Group */ |
| 270 | add %o1, 8, %o1 /* IEU1 */ |
| 271 | sub %o3, %g1, %o4 /* IEU0 Group */ |
| 272 | |
| 273 | #ifdef EIGHTBIT_NOT_RARE |
| 274 | andn %o4, %o3, %o4 /* IEU0 Group */ |
| 275 | #endif |
| 276 | andcc %o4, %g2, %g0 /* IEU1 Group */ |
| 277 | be,a,pt %xcc, 15b /* CTI */ |
| 278 | stx %o3, [%o0 - 8] /* Store */ |
| 279 | srlx %o3, 56, %o4 /* IEU0 Group */ |
| 280 | |
| 281 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 282 | be,pn %icc, 22f /* CTI */ |
| 283 | srlx %o3, 48, %o4 /* IEU0 */ |
| 284 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 285 | |
| 286 | be,pn %icc, 21f /* CTI */ |
| 287 | srlx %o3, 40, %o4 /* IEU0 */ |
| 288 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 289 | be,pn %icc, 20f /* CTI */ |
| 290 | |
| 291 | srlx %o3, 32, %o4 /* IEU0 */ |
| 292 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 293 | be,pn %icc, 19f /* CTI */ |
| 294 | srlx %o3, 24, %o4 /* IEU0 */ |
| 295 | |
| 296 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 297 | be,pn %icc, 18f /* CTI */ |
| 298 | srlx %o3, 16, %o4 /* IEU0 */ |
| 299 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 300 | |
| 301 | be,pn %icc, 17f /* CTI */ |
| 302 | srlx %o3, 8, %o4 /* IEU0 */ |
| 303 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 304 | be,pn %icc, 16f /* CTI */ |
| 305 | |
| 306 | andcc %o3, 0xff, %g0 /* IEU1 Group */ |
| 307 | bne,pn %icc, 15b /* CTI */ |
| 308 | stx %o3, [%o0 - 8] /* Store */ |
| 309 | retl /* CTI+IEU1 Group */ |
| 310 | |
| 311 | mov %g6, %o0 /* IEU0 */ |
| 312 | |
| 313 | .align 16 |
| 314 | 16: srlx %o3, 8, %o4 /* IEU0 Group */ |
| 315 | stb %o4, [%o0 - 2] /* Store */ |
| 316 | 17: srlx %o3, 16, %o4 /* IEU0 Group */ |
| 317 | stb %o4, [%o0 - 3] /* Store */ |
| 318 | |
| 319 | 18: srlx %o3, 24, %o4 /* IEU0 Group */ |
| 320 | stb %o4, [%o0 - 4] /* Store */ |
| 321 | 19: srlx %o3, 32, %o4 /* IEU0 Group */ |
| 322 | stw %o4, [%o0 - 8] /* Store */ |
| 323 | |
| 324 | retl /* CTI+IEU1 Group */ |
| 325 | mov %g6, %o0 /* IEU0 */ |
| 326 | nop |
| 327 | nop |
| 328 | |
| 329 | 20: srlx %o3, 40, %o4 /* IEU0 Group */ |
| 330 | stb %o4, [%o0 - 6] /* Store */ |
| 331 | 21: srlx %o3, 48, %o4 /* IEU0 Group */ |
| 332 | stb %o4, [%o0 - 7] /* Store */ |
| 333 | |
| 334 | 22: srlx %o3, 56, %o4 /* IEU0 Group */ |
| 335 | stb %o4, [%o0 - 8] /* Store */ |
| 336 | retl /* CTI+IEU1 Group */ |
| 337 | mov %g6, %o0 /* IEU0 */ |
| 338 | END(strcat) |
| 339 | libc_hidden_def(strcat) |