| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* Copy SRC to DEST returning the address of the terminating '\0' in DEST. |
| 2 | For SPARC v9. |
| 3 | Copyright (C) 1998, 1999, 2002, 2003, 2004 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | Contributed by Jan Vondrak <jvon4518@ss1000.ms.mff.cuni.cz> and |
| 6 | Jakub Jelinek <jj@ultra.linux.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 | .register %g2, #scratch |
| 26 | .register %g3, #scratch |
| 27 | .register %g6, #scratch |
| 28 | #endif |
| 29 | |
| 30 | /* Normally, this uses |
| 31 | ((xword - 0x0101010101010101) & 0x8080808080808080) test |
| 32 | to find out if any byte in xword could be zero. This is fast, but |
| 33 | also gives false alarm for any byte in range 0x81-0xff. It does |
| 34 | not matter for correctness, as if this test tells us there could |
| 35 | be some zero byte, we check it byte by byte, but if bytes with |
| 36 | high bits set are common in the strings, then this will give poor |
| 37 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm |
| 38 | will use one tick slower, but more precise test |
| 39 | ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080), |
| 40 | which does not give any false alarms (but if some bits are set, |
| 41 | one cannot assume from it which bytes are zero and which are not). |
| 42 | It is yet to be measured, what is the correct default for glibc |
| 43 | in these days for an average user. |
| 44 | */ |
| 45 | |
| 46 | .text |
| 47 | .align 32 |
| 48 | ENTRY(stpcpy) |
| 49 | sethi %hi(0x01010101), %g1 /* IEU0 Group */ |
| 50 | or %g1, %lo(0x01010101), %g1 /* IEU0 Group */ |
| 51 | andcc %o0, 7, %g0 /* IEU1 */ |
| 52 | sllx %g1, 32, %g2 /* IEU0 Group */ |
| 53 | |
| 54 | bne,pn %icc, 12f /* CTI */ |
| 55 | andcc %o1, 7, %g3 /* IEU1 */ |
| 56 | or %g1, %g2, %g1 /* IEU0 Group */ |
| 57 | bne,pn %icc, 14f /* CTI */ |
| 58 | |
| 59 | sllx %g1, 7, %g2 /* IEU0 Group */ |
| 60 | 1: ldx [%o1], %o3 /* Load */ |
| 61 | add %o1, 8, %o1 /* IEU1 */ |
| 62 | 2: mov %o3, %g3 /* IEU0 Group */ |
| 63 | |
| 64 | sub %o3, %g1, %o2 /* IEU1 */ |
| 65 | 3: ldxa [%o1] ASI_PNF, %o3 /* Load */ |
| 66 | #ifdef EIGHTBIT_NOT_RARE |
| 67 | andn %o2, %g3, %o2 /* IEU0 Group */ |
| 68 | #endif |
| 69 | add %o0, 8, %o0 /* IEU0 Group */ |
| 70 | andcc %o2, %g2, %g0 /* IEU1 */ |
| 71 | |
| 72 | add %o1, 8, %o1 /* IEU0 Group */ |
| 73 | be,a,pt %xcc, 2b /* CTI */ |
| 74 | stx %g3, [%o0 - 8] /* Store */ |
| 75 | srlx %g3, 56, %g5 /* IEU0 Group */ |
| 76 | |
| 77 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 78 | be,pn %icc, 11f /* CTI */ |
| 79 | srlx %g3, 48, %g4 /* IEU0 */ |
| 80 | andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| 81 | |
| 82 | be,pn %icc, 10f /* CTI */ |
| 83 | srlx %g3, 40, %g5 /* IEU0 */ |
| 84 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 85 | be,pn %icc, 9f /* CTI */ |
| 86 | |
| 87 | srlx %g3, 32, %g4 /* IEU0 */ |
| 88 | andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| 89 | be,pn %icc, 8f /* CTI */ |
| 90 | srlx %g3, 24, %g5 /* IEU0 */ |
| 91 | |
| 92 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 93 | be,pn %icc, 7f /* CTI */ |
| 94 | srlx %g3, 16, %g4 /* IEU0 */ |
| 95 | andcc %g4, 0xff, %g0 /* IEU1 Group */ |
| 96 | |
| 97 | be,pn %icc, 6f /* CTI */ |
| 98 | srlx %g3, 8, %g5 /* IEU0 */ |
| 99 | andcc %g5, 0xff, %g0 /* IEU1 Group */ |
| 100 | be,pn %icc, 5f /* CTI */ |
| 101 | |
| 102 | sub %o3, %g1, %o2 /* IEU0 */ |
| 103 | stx %g3, [%o0 - 8] /* Store Group */ |
| 104 | andcc %g3, 0xff, %g0 /* IEU1 */ |
| 105 | bne,pt %icc, 3b /* CTI */ |
| 106 | |
| 107 | mov %o3, %g3 /* IEU0 Group */ |
| 108 | 4: retl /* CTI+IEU1 Group */ |
| 109 | sub %o0, 1, %o0 /* IEU0 */ |
| 110 | |
| 111 | .align 16 |
| 112 | 6: ba,pt %xcc, 23f /* CTI Group */ |
| 113 | sub %o0, 3, %g6 /* IEU0 */ |
| 114 | 5: sub %o0, 2, %g6 /* IEU0 Group */ |
| 115 | stb %g5, [%o0 - 2] /* Store */ |
| 116 | |
| 117 | srlx %g3, 16, %g4 /* IEU0 Group */ |
| 118 | 23: sth %g4, [%o0 - 4] /* Store */ |
| 119 | srlx %g3, 32, %g4 /* IEU0 Group */ |
| 120 | stw %g4, [%o0 - 8] /* Store */ |
| 121 | |
| 122 | retl /* CTI+IEU1 Group */ |
| 123 | mov %g6, %o0 /* IEU0 */ |
| 124 | 8: ba,pt %xcc, 24f /* CTI Group */ |
| 125 | sub %o0, 5, %g6 /* IEU0 */ |
| 126 | |
| 127 | 7: sub %o0, 4, %g6 /* IEU0 Group */ |
| 128 | stb %g5, [%o0 - 4] /* Store */ |
| 129 | srlx %g3, 32, %g4 /* IEU0 Group */ |
| 130 | 24: stw %g4, [%o0 - 8] /* Store */ |
| 131 | |
| 132 | retl /* CTI+IEU1 Group */ |
| 133 | mov %g6, %o0 /* IEU0 */ |
| 134 | 10: ba,pt %xcc, 25f /* CTI Group */ |
| 135 | sub %o0, 7, %g6 /* IEU0 */ |
| 136 | |
| 137 | 9: sub %o0, 6, %g6 /* IEU0 Group */ |
| 138 | stb %g5, [%o0 - 6] /* Store */ |
| 139 | srlx %g3, 48, %g4 /* IEU0 */ |
| 140 | 25: sth %g4, [%o0 - 8] /* Store Group */ |
| 141 | |
| 142 | retl /* CTI+IEU1 Group */ |
| 143 | mov %g6, %o0 /* IEU0 */ |
| 144 | 11: stb %g5, [%o0 - 8] /* Store Group */ |
| 145 | retl /* CTI+IEU1 Group */ |
| 146 | |
| 147 | sub %o0, 8, %o0 /* IEU0 */ |
| 148 | |
| 149 | .align 16 |
| 150 | 12: or %g1, %g2, %g1 /* IEU0 Group */ |
| 151 | ldub [%o1], %o3 /* Load */ |
| 152 | sllx %g1, 7, %g2 /* IEU0 Group */ |
| 153 | stb %o3, [%o0] /* Store Group */ |
| 154 | |
| 155 | 13: add %o0, 1, %o0 /* IEU0 */ |
| 156 | add %o1, 1, %o1 /* IEU1 */ |
| 157 | andcc %o3, 0xff, %g0 /* IEU1 Group */ |
| 158 | be,pn %icc, 4b /* CTI */ |
| 159 | |
| 160 | lduba [%o1] ASI_PNF, %o3 /* Load */ |
| 161 | andcc %o0, 7, %g0 /* IEU1 Group */ |
| 162 | bne,a,pt %icc, 13b /* CTI */ |
| 163 | stb %o3, [%o0] /* Store */ |
| 164 | |
| 165 | andcc %o1, 7, %g3 /* IEU1 Group */ |
| 166 | be,a,pt %icc, 1b /* CTI */ |
| 167 | ldx [%o1], %o3 /* Load */ |
| 168 | 14: orcc %g0, 64, %g4 /* IEU1 Group */ |
| 169 | |
| 170 | sllx %g3, 3, %g5 /* IEU0 */ |
| 171 | sub %o1, %g3, %o1 /* IEU0 Group */ |
| 172 | sub %g4, %g5, %g4 /* IEU1 */ |
| 173 | /* %g1 = 0101010101010101 * |
| 174 | * %g2 = 8080808080808080 * |
| 175 | * %g3 = source alignment * |
| 176 | * %g5 = number of bits to shift left * |
| 177 | * %g4 = number of bits to shift right */ |
| 178 | ldxa [%o1] ASI_PNF, %o5 /* Load Group */ |
| 179 | |
| 180 | addcc %o1, 8, %o1 /* IEU1 */ |
| 181 | 15: sllx %o5, %g5, %o3 /* IEU0 Group */ |
| 182 | ldxa [%o1] ASI_PNF, %o5 /* Load */ |
| 183 | srlx %o5, %g4, %o4 /* IEU0 Group */ |
| 184 | |
| 185 | add %o0, 8, %o0 /* IEU1 */ |
| 186 | or %o3, %o4, %o3 /* IEU0 Group */ |
| 187 | add %o1, 8, %o1 /* IEU1 */ |
| 188 | sub %o3, %g1, %o4 /* IEU0 Group */ |
| 189 | |
| 190 | #ifdef EIGHTBIT_NOT_RARE |
| 191 | andn %o4, %o3, %o4 /* IEU0 Group */ |
| 192 | #endif |
| 193 | andcc %o4, %g2, %g0 /* IEU1 Group */ |
| 194 | be,a,pt %xcc, 15b /* CTI */ |
| 195 | stx %o3, [%o0 - 8] /* Store */ |
| 196 | srlx %o3, 56, %o4 /* IEU0 Group */ |
| 197 | |
| 198 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 199 | be,pn %icc, 22f /* CTI */ |
| 200 | srlx %o3, 48, %o4 /* IEU0 */ |
| 201 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 202 | |
| 203 | be,pn %icc, 21f /* CTI */ |
| 204 | srlx %o3, 40, %o4 /* IEU0 */ |
| 205 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 206 | be,pn %icc, 20f /* CTI */ |
| 207 | |
| 208 | srlx %o3, 32, %o4 /* IEU0 */ |
| 209 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 210 | be,pn %icc, 19f /* CTI */ |
| 211 | srlx %o3, 24, %o4 /* IEU0 */ |
| 212 | |
| 213 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 214 | be,pn %icc, 18f /* CTI */ |
| 215 | srlx %o3, 16, %o4 /* IEU0 */ |
| 216 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 217 | |
| 218 | be,pn %icc, 17f /* CTI */ |
| 219 | srlx %o3, 8, %o4 /* IEU0 */ |
| 220 | andcc %o4, 0xff, %g0 /* IEU1 Group */ |
| 221 | be,pn %icc, 16f /* CTI */ |
| 222 | |
| 223 | andcc %o3, 0xff, %g0 /* IEU1 Group */ |
| 224 | bne,pn %icc, 15b /* CTI */ |
| 225 | stx %o3, [%o0 - 8] /* Store */ |
| 226 | retl /* CTI+IEU1 Group */ |
| 227 | |
| 228 | sub %o0, 1, %o0 /* IEU0 */ |
| 229 | |
| 230 | .align 16 |
| 231 | 17: ba,pt %xcc, 26f /* CTI Group */ |
| 232 | subcc %o0, 3, %g6 /* IEU1 */ |
| 233 | 18: ba,pt %xcc, 27f /* CTI Group */ |
| 234 | subcc %o0, 4, %g6 /* IEU1 */ |
| 235 | |
| 236 | 19: ba,pt %xcc, 28f /* CTI Group */ |
| 237 | subcc %o0, 5, %g6 /* IEU1 */ |
| 238 | 16: subcc %o0, 2, %g6 /* IEU1 Group */ |
| 239 | srlx %o3, 8, %o4 /* IEU0 */ |
| 240 | |
| 241 | stb %o4, [%o0 - 2] /* Store */ |
| 242 | 26: srlx %o3, 16, %o4 /* IEU0 Group */ |
| 243 | stb %o4, [%o0 - 3] /* Store */ |
| 244 | 27: srlx %o3, 24, %o4 /* IEU0 Group */ |
| 245 | |
| 246 | stb %o4, [%o0 - 4] /* Store */ |
| 247 | 28: srlx %o3, 32, %o4 /* IEU0 Group */ |
| 248 | stw %o4, [%o0 - 8] /* Store */ |
| 249 | retl /* CTI+IEU1 Group */ |
| 250 | |
| 251 | mov %g6, %o0 /* IEU0 */ |
| 252 | |
| 253 | .align 16 |
| 254 | 21: ba,pt %xcc, 29f /* CTI Group */ |
| 255 | subcc %o0, 7, %g6 /* IEU1 */ |
| 256 | 22: ba,pt %xcc, 30f /* CTI Group */ |
| 257 | subcc %o0, 8, %g6 /* IEU1 */ |
| 258 | |
| 259 | 20: subcc %o0, 6, %g6 /* IEU1 Group */ |
| 260 | srlx %o3, 40, %o4 /* IEU0 */ |
| 261 | stb %o4, [%o0 - 6] /* Store */ |
| 262 | 29: srlx %o3, 48, %o4 /* IEU0 Group */ |
| 263 | |
| 264 | stb %o4, [%o0 - 7] /* Store */ |
| 265 | 30: srlx %o3, 56, %o4 /* IEU0 Group */ |
| 266 | stb %o4, [%o0 - 8] /* Store */ |
| 267 | retl /* CTI+IEU1 Group */ |
| 268 | |
| 269 | mov %g6, %o0 /* IEU0 */ |
| 270 | END(stpcpy) |
| 271 | libc_hidden_def(stpcpy) |