projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 407d26b7 UD |
1 | /* rawmemchr (str, ch) -- Return pointer to first occurrence of CH in STR. |
| 2 | For SPARC v9. | |
| 04277e02 | 3 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
| 407d26b7 UD |
4 | This file is part of the GNU C Library. |
| 5 | Contributed by Jakub Jelinek <jj@ultra.linux.cz>. | |
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6 | This version is developed using the same algorithm as the fast C |
| 7 | version which carries the following introduction: | |
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8 | Based on strlen implementation by Torbjorn Granlund (tege@sics.se), |
| 9 | with help from Dan Sahlin (dan@sics.se) and | |
| 10 | commentary by Jim Blandy (jimb@ai.mit.edu); | |
| 11 | adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), | |
| 12 | and implemented by Roland McGrath (roland@ai.mit.edu). | |
| 13 | ||
| 14 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
15 | modify it under the terms of the GNU Lesser General Public |
| 16 | License as published by the Free Software Foundation; either | |
| 17 | version 2.1 of the License, or (at your option) any later version. | |
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18 | |
| 19 | The GNU C Library is distributed in the hope that it will be useful, | |
| 20 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 22 | Lesser General Public License for more details. |
| 407d26b7 | 23 | |
| 41bdb6e2 | 24 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
25 | License along with the GNU C Library; if not, see |
| 26 | <http://www.gnu.org/licenses/>. */ | |
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27 | |
| 28 | #include <sysdep.h> | |
| 29 | #include <asm/asi.h> | |
| 30 | #ifndef XCC | |
| 31 | #define XCC xcc | |
| 32 | #define USE_BPR | |
| 8cb079d4 UD |
33 | .register %g2, #scratch |
| 34 | .register %g3, #scratch | |
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35 | #endif |
| 36 | ||
| 37 | /* Normally, this uses | |
| 38 | ((xword - 0x0101010101010101) & 0x8080808080808080) test | |
| 39 | to find out if any byte in xword could be zero. This is fast, but | |
| 40 | also gives false alarm for any byte in range 0x81-0xff. It does | |
| 41 | not matter for correctness, as if this test tells us there could | |
| 42 | be some zero byte, we check it byte by byte, but if bytes with | |
| 43 | high bits set are common in the strings, then this will give poor | |
| 44 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm | |
| 45 | will use one tick slower, but more precise test | |
| 46 | ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080), | |
| 47 | which does not give any false alarms (but if some bits are set, | |
| 48 | one cannot assume from it which bytes are zero and which are not). | |
| 49 | It is yet to be measured, what is the correct default for glibc | |
| 50 | in these days for an average user. | |
| 51 | */ | |
| 52 | ||
| 53 | .text | |
| 54 | .align 32 | |
| 55 | ENTRY(__rawmemchr) | |
| 56 | and %o1, 0xff, %o1 /* IEU0 Group */ | |
| 57 | sethi %hi(0x01010101), %g1 /* IEU1 */ | |
| 58 | ldub [%o0], %o3 /* Load */ | |
| 59 | sll %o1, 8, %o4 /* IEU0 Group */ | |
| 9c84384c | 60 | |
| 407d26b7 UD |
61 | or %g1, %lo(0x01010101), %g1 /* IEU1 */ |
| 62 | sllx %g1, 32, %g2 /* IEU0 Group */ | |
| 63 | or %o4, %o1, %o4 /* IEU1 */ | |
| 64 | andcc %o0, 7, %g0 /* IEU1 Group */ | |
| 65 | ||
| 66 | sll %o4, 16, %g5 /* IEU0 */ | |
| 67 | or %o4, %g5, %o4 /* IEU0 Group */ | |
| 68 | or %g1, %g2, %g1 /* IEU1 */ | |
| 69 | bne,pn %icc, 32f /* CTI */ | |
| 70 | ||
| 71 | sllx %o4, 32, %g5 /* IEU0 Group */ | |
| 72 | cmp %o3, %o1 /* IEU1 */ | |
| 73 | be,pn %icc, 30f /* CTI */ | |
| 74 | sllx %g1, 7, %g2 /* IEU0 Group */ | |
| 75 | ||
| 76 | 18: ldx [%o0], %o3 /* Load */ | |
| 77 | or %o4, %g5, %o4 /* IEU1 */ | |
| 78 | add %o0, 8, %o0 /* IEU0 Group */ | |
| 79 | 19: xor %o3, %o4, %o3 /* IEU0 Group */ | |
| 80 | ||
| 81 | sub %o3, %g1, %o2 /* IEU0 Group */ | |
| 82 | #ifdef EIGHTBIT_NOT_RARE | |
| 8cb079d4 | 83 | andn %o2, %o3, %o5 /* IEU0 Group */ |
| 407d26b7 | 84 | ldxa [%o0] ASI_PNF, %o3 /* Load */ |
| 8cb079d4 | 85 | andcc %o5, %g2, %g0 /* IEU1 Group */ |
| 407d26b7 UD |
86 | #else |
| 87 | ldxa [%o0] ASI_PNF, %o3 /* Load */ | |
| 88 | andcc %o2, %g2, %g0 /* IEU1 Group */ | |
| 89 | #endif | |
| 90 | be,pt %xcc, 19b /* CTI */ | |
| 91 | ||
| 92 | add %o0, 8, %o0 /* IEU0 */ | |
| 93 | addcc %o2, %g1, %g3 /* IEU1 Group */ | |
| 94 | srlx %o2, 32, %o2 /* IEU0 */ | |
| 95 | 20: andcc %o2, %g2, %g0 /* IEU1 Group */ | |
| 96 | ||
| 97 | be,pn %xcc, 21f /* CTI */ | |
| 98 | srlx %g3, 56, %o2 /* IEU0 */ | |
| 99 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 100 | be,pn %icc, 29f /* CTI */ | |
| 101 | ||
| 102 | srlx %g3, 48, %o2 /* IEU0 */ | |
| 103 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 104 | be,pn %icc, 28f /* CTI */ | |
| 105 | srlx %g3, 40, %o2 /* IEU0 */ | |
| 106 | ||
| 107 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 108 | be,pn %icc, 27f /* CTI */ | |
| 109 | srlx %g3, 32, %o2 /* IEU0 */ | |
| 110 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 111 | ||
| 112 | be,pn %icc, 26f /* CTI */ | |
| 113 | 21: srlx %g3, 24, %o2 /* IEU0 */ | |
| 114 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 115 | be,pn %icc, 25f /* CTI */ | |
| 116 | ||
| 117 | srlx %g3, 16, %o2 /* IEU0 */ | |
| 118 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 119 | be,pn %icc, 24f /* CTI */ | |
| 120 | srlx %g3, 8, %o2 /* IEU0 */ | |
| 121 | ||
| 122 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
| 123 | be,pn %icc, 23f /* CTI */ | |
| 124 | xor %o3, %o4, %o3 /* IEU0 */ | |
| 125 | andcc %g3, 0xff, %g0 /* IEU1 Group */ | |
| 126 | ||
| 127 | be,pn %icc, 22f /* CTI */ | |
| 128 | sub %o3, %g1, %o2 /* IEU0 */ | |
| 129 | ldxa [%o0] ASI_PNF, %o3 /* Load */ | |
| 130 | andcc %o2, %g2, %g0 /* IEU1 Group */ | |
| 131 | ||
| 132 | be,pt %xcc, 19b /* CTI */ | |
| 133 | add %o0, 8, %o0 /* IEU0 */ | |
| 134 | addcc %o2, %g1, %g3 /* IEU1 Group */ | |
| 135 | ba,pt %xcc, 20b /* CTI */ | |
| 136 | ||
| 137 | srlx %o2, 32, %o2 /* IEU0 */ | |
| 138 | ||
| 139 | .align 16 | |
| 140 | 22: retl /* CTI+IEU1 Group */ | |
| 141 | add %o0, -9, %o0 /* IEU0 */ | |
| 142 | 23: retl /* CTI+IEU1 Group */ | |
| 143 | add %o0, -10, %o0 /* IEU0 */ | |
| 144 | ||
| 145 | 24: retl /* CTI+IEU1 Group */ | |
| 146 | add %o0, -11, %o0 /* IEU0 */ | |
| 147 | 25: retl /* CTI+IEU1 Group */ | |
| 148 | add %o0, -12, %o0 /* IEU0 */ | |
| 149 | ||
| 150 | 26: retl /* CTI+IEU1 Group */ | |
| 151 | add %o0, -13, %o0 /* IEU0 */ | |
| 152 | 27: retl /* CTI+IEU1 Group */ | |
| 153 | add %o0, -14, %o0 /* IEU0 */ | |
| 154 | ||
| 155 | 28: retl /* CTI+IEU1 Group */ | |
| 156 | add %o0, -15, %o0 /* IEU0 */ | |
| 157 | 29: retl /* CTI+IEU1 Group */ | |
| 158 | add %o0, -16, %o0 /* IEU0 */ | |
| 159 | ||
| 160 | 30: retl /* CTI+IEU1 Group */ | |
| 161 | nop /* IEU0 */ | |
| 162 | ||
| 163 | .align 16 | |
| 164 | 32: andcc %o0, 7, %g0 /* IEU1 Group */ | |
| 165 | be,a,pn %icc, 18b /* CTI */ | |
| 166 | sllx %g1, 7, %g2 /* IEU0 */ | |
| 167 | add %o0, 1, %o0 /* IEU0 Group */ | |
| 168 | ||
| 169 | cmp %o3, %o1 /* IEU1 */ | |
| 170 | bne,a,pt %icc, 32b /* CTI */ | |
| 171 | lduba [%o0] ASI_PNF, %o3 /* Load */ | |
| 172 | retl /* CTI+IEU1 Group */ | |
| 173 | ||
| 174 | add %o0, -1, %o0 /* IEU0 */ | |
| 175 | END(__rawmemchr) | |
| 176 | ||
| 37ba7d66 | 177 | libc_hidden_def (__rawmemchr) |
| 407d26b7 | 178 | weak_alias (__rawmemchr, rawmemchr) |