| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less |
| 2 | than N. |
| 3 | For SPARC v7. |
| 4 | Copyright (C) 1996, 1999, 2000, 2003 Free Software Foundation, Inc. |
| 5 | This file is part of the GNU C Library. |
| 6 | Contributed by Jakub Jelinek <jj@ultra.linux.cz> and |
| 7 | David S. Miller <davem@caip.rutgers.edu>. |
| 8 | This version is developed using the same algorithm as the fast C |
| 9 | version which carries the following introduction: |
| 10 | Based on strlen implementation by Torbjorn Granlund (tege@sics.se), |
| 11 | with help from Dan Sahlin (dan@sics.se) and |
| 12 | commentary by Jim Blandy (jimb@ai.mit.edu); |
| 13 | adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), |
| 14 | and implemented by Roland McGrath (roland@ai.mit.edu). |
| 15 | |
| 16 | The GNU C Library is free software; you can redistribute it and/or |
| 17 | modify it under the terms of the GNU Lesser General Public |
| 18 | License as published by the Free Software Foundation; either |
| 19 | version 2.1 of the License, or (at your option) any later version. |
| 20 | |
| 21 | The GNU C Library is distributed in the hope that it will be useful, |
| 22 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | Lesser General Public License for more details. |
| 25 | |
| 26 | You should have received a copy of the GNU Lesser General Public |
| 27 | License along with the GNU C Library; if not, write to the Free |
| 28 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 29 | 02111-1307 USA. */ |
| 30 | |
| 31 | .text |
| 32 | .align 4 |
| 33 | 0: cmp %o2, 0 |
| 34 | be 9f |
| 35 | sethi %hi(0x80808080), %o4 |
| 36 | ldub [%o0], %g4 |
| 37 | cmp %g4, %o1 |
| 38 | be 1f |
| 39 | add %o0, 1, %o0 |
| 40 | subcc %o2, 1, %o2 |
| 41 | be 9f |
| 42 | andcc %o0, 3, %g0 |
| 43 | be 4f |
| 44 | or %o4, %lo(0x80808080), %o3 |
| 45 | ldub [%o0], %g4 |
| 46 | cmp %g4, %o1 |
| 47 | be 1f |
| 48 | add %o0, 1, %o0 |
| 49 | subcc %o2, 1, %o2 |
| 50 | be 9f |
| 51 | andcc %o0, 3, %g0 |
| 52 | be 5f |
| 53 | sethi %hi(0x01010101), %o5 |
| 54 | ldub [%o0], %g4 |
| 55 | cmp %g4, %o1 |
| 56 | be 1f |
| 57 | add %o0, 1, %o0 |
| 58 | subcc %o2, 1, %o2 |
| 59 | bne,a 7f |
| 60 | and %o2, 3, %g1 |
| 61 | retl |
| 62 | clr %o0 |
| 63 | 1: retl |
| 64 | sub %o0, 1, %o0 |
| 65 | |
| 66 | ENTRY(memchr) |
| 67 | andcc %o1, 0xff, %o1 |
| 68 | sll %o1, 8, %g6 |
| 69 | andcc %o0, 3, %g0 |
| 70 | or %o1, %g6, %g6 |
| 71 | sll %g6, 16, %o3 |
| 72 | bne 0b |
| 73 | or %o3, %g6, %g2 |
| 74 | sethi %hi(0x80808080), %o4 |
| 75 | or %o4, %lo(0x80808080), %o3 |
| 76 | 4: sethi %hi(0x01010101), %o5 |
| 77 | 5: and %o2, 3, %g1 |
| 78 | 7: andcc %o2, 0xfffffffc, %o2 |
| 79 | be 0f |
| 80 | or %o5, %lo(0x01010101), %g6 |
| 81 | ld [%o0], %g4 |
| 82 | 6: xor %g4, %g2, %g5 |
| 83 | add %o0, 4, %o0 |
| 84 | sub %g5, %g6, %g5 |
| 85 | andcc %g5, %o3, %g0 |
| 86 | bne 8f |
| 87 | subcc %o2, 4, %o2 |
| 88 | bne,a 6b |
| 89 | ld [%o0], %g4 |
| 90 | 0: cmp %g1, 0 |
| 91 | 1: be 9f |
| 92 | add %o0, 4, %o0 |
| 93 | ldub [%o0 - 4], %g4 |
| 94 | cmp %g4, %o1 |
| 95 | be 4f |
| 96 | cmp %g1, 1 |
| 97 | be 9f |
| 98 | ldub [%o0 - 3], %g4 |
| 99 | cmp %g4, %o1 |
| 100 | be 3f |
| 101 | cmp %g1, 2 |
| 102 | be 9f |
| 103 | ldub [%o0 - 2], %g4 |
| 104 | cmp %g4, %o1 |
| 105 | be 2f |
| 106 | nop |
| 107 | 9: retl |
| 108 | clr %o0 |
| 109 | |
| 110 | /* Check every byte. */ |
| 111 | 8: srl %g4, 24, %g5 |
| 112 | and %g5, 0xff, %g5 |
| 113 | cmp %g5, %o1 |
| 114 | be 4f |
| 115 | srl %g4, 16, %g5 |
| 116 | and %g5, 0xff, %g5 |
| 117 | cmp %g5, %o1 |
| 118 | be 3f |
| 119 | srl %g4, 8, %g5 |
| 120 | and %g5, 0xff, %g5 |
| 121 | cmp %g5, %o1 |
| 122 | be 2f |
| 123 | and %g4, 0xff, %g5 |
| 124 | cmp %g5, %o1 |
| 125 | be 1f |
| 126 | cmp %o2, 0 |
| 127 | bne,a 6b |
| 128 | ld [%o0], %g4 |
| 129 | b 1b |
| 130 | cmp %g1, 0 |
| 131 | 1: retl |
| 132 | sub %o0, 1, %o0 |
| 133 | 2: retl |
| 134 | sub %o0, 2, %o0 |
| 135 | 3: retl |
| 136 | sub %o0, 3, %o0 |
| 137 | 4: retl |
| 138 | sub %o0, 4, %o0 |
| 139 | END(memchr) |
| 140 | libc_hidden_def(memchr) |
| 141 | |
| 142 | weak_alias(memchr,__ubp_memchr) |