1 /* $NetBSD: bcmp.S,v 1.6 2013/09/07 19:06:29 chs Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by J.T. Conklin. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1990 The Regents of the University of California. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * the Systems Programming Group of the University of Utah Computer 38 * Science Department. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 #include <machine/asm.h> 66 67 #if defined(LIBC_SCCS) && !defined(lint) 68 #if 0 69 RCSID("from: @(#)bcmp.s 5.1 (Berkeley) 5/12/90") 70 #else 71 RCSID("$NetBSD: bcmp.S,v 1.6 2013/09/07 19:06:29 chs Exp $") 72 #endif 73 #endif /* LIBC_SCCS and not lint */ 74 75 #ifdef __mcoldfire__ 76 #define CMPMB(a,b) movb b,%d2; cmpb a,%d2 77 #define CMPMW(a,b) movw b,%d2; cmpw a,%d2 78 #define CMPML(a,b) movl b,%d2; cmpl a,%d2 79 #else 80 #define CMPMB(a,b) cmpmb a,b 81 #define CMPMW(a,b) cmpmw a,b 82 #define CMPML(a,b) cmpml a,b 83 #endif 84 85 ENTRY(bcmp) 86 movl 4(%sp),%a0 | string 1 87 movl 8(%sp),%a1 | string 2 88 movl 12(%sp),%d1 | length 89 #ifdef __mcoldfire__ 90 movl %d2,-(%sp) | save temp 91 #endif 92 93 /* 94 * It isn't worth the overhead of aligning to {long}word boundries 95 * if the string is too short. 96 */ 97 cmpl #8,%d1 98 jlt .Lbcbyte 99 100 #ifdef __mc68010__ 101 /* 102 * The 68010 cannot access a word or long on an odd boundary, 103 * period. If the source and the destination addresses aren't 104 * of the same evenness, we're forced to do a bytewise compare. 105 */ 106 movl %a0,%d0 107 addl %a1,%d0 108 btst #0,%d0 109 jne .Lbcbyte 110 #endif /* __mc68010__ */ 111 112 /* word align */ 113 movl %a0,%d0 114 btst #0,%d0 115 jeq .Lbcalgndw 116 CMPMB((%a0)+,(%a1)+) 117 jne .Lbcnoteq 118 subql #1,%d1 119 .Lbcalgndw: 120 /* long word align */ 121 btst #1,%d0 122 jeq .Lbcalgndl 123 CMPMW((%a0)+,(%a1)+) 124 jne .Lbcnoteq 125 subql #2,%d1 126 .Lbcalgndl: 127 /* compare by 8 longwords */ 128 movl %d1,%d0 129 lsrl #5,%d0 | cnt = len / 32 130 jeq .Lbclong | if (cnt) 131 andl #31,%d1 | len %= 32 132 subql #1,%d0 | set up for dbf 133 .Lbc32loop: 134 CMPML((%a0)+,(%a1)+) | compare 1 of 8 longwords 135 jne .Lbcnoteq | not equal, return non-zero 136 CMPML((%a0)+,(%a1)+) | compare 2 of 8 longwords 137 jne .Lbcnoteq 138 CMPML((%a0)+,(%a1)+) | compare 3 of 8 longwords 139 jne .Lbcnoteq 140 CMPML((%a0)+,(%a1)+) | compare 4 of 8 longwords 141 jne .Lbcnoteq 142 CMPML((%a0)+,(%a1)+) | compare 5 of 8 longwords 143 jne .Lbcnoteq 144 CMPML((%a0)+,(%a1)+) | compare 6 of 8 longwords 145 jne .Lbcnoteq 146 CMPML((%a0)+,(%a1)+) | compare 7 of 8 longwords 147 jne .Lbcnoteq 148 CMPML((%a0)+,(%a1)+) | compare 8 of 8 longwords 149 jne .Lbcnoteq 150 #ifndef __mcoldfire__ 151 dbf %d0,.Lbc32loop | till done 152 clrw %d0 153 #endif 154 subql #1,%d0 155 jcc .Lbc32loop 156 157 .Lbclong: 158 /* compare by longwords */ 159 movl %d1,%d0 160 lsrl #2,%d0 | cnt = len / 4 161 jeq .Lbcbyte | if (cnt) 162 subql #1,%d0 | set up for dbf 163 .Lbclloop: 164 CMPML((%a0)+,(%a1)+) | compare a longword 165 jne .Lbcnoteq | not equal, return non-zero 166 #ifdef __mcoldfire__ 167 subql #1,%d0 | decrement 168 jcc .Lbclloop | till done 169 #else 170 dbf %d0,.Lbclloop | till done 171 #endif 172 andl #3,%d1 | len %= 4 173 jeq .Lbcdone 174 175 subql #1,%d1 | set up for dbf 176 .Lbcbloop: 177 CMPMB((%a0)+,(%a1)+) | compare a byte 178 jne .Lbcnoteq | not equal, return non-zero 179 .Lbcbyte: 180 #ifdef __mcoldfire__ 181 subql #1,%d0 | decrement 182 jcc .Lbcbloop | till done 183 #else 184 dbf %d1,.Lbcbloop 185 #endif 186 .Lbcdone: 187 #ifdef __mcoldfire__ 188 movl (%sp)+,%d2 | restore temp 189 #endif 190 movql #0,%d0 191 rts 192 193 .Lbcnoteq: 194 movql #1,%d0 195 rts 196 END(bcmp) 197
Indexes created Sat Oct 18 08:10:09 GMT 2025