78ed81a3 |
1 | /* |
2 | * Copyright (c) 1993 Winning Strategies, Inc. |
3 | * All rights reserved. |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * 3. All advertising materials mentioning features or use of this software |
14 | * must display the following acknowledgement: |
15 | * This product includes software developed by Winning Strategies, Inc. |
16 | * 4. The name of the author may not be used to endorse or promote products |
17 | * derived from this software withough specific prior written permission |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 | * |
30 | * $Id: bcmp.s,v 1.1 1993/08/16 18:40:23 jtc Exp $ |
31 | */ |
32 | |
33 | #if defined(LIBC_RCS) && !defined(lint) |
34 | .asciz "$Id: bcmp.s,v 1.1 1993/08/16 18:40:23 jtc Exp $" |
35 | #endif /* LIBC_RCS and not lint */ |
36 | |
37 | #include "DEFS.h" |
38 | |
39 | /* |
40 | * bcmp (void *b1, void *b2, size_t len) |
41 | * |
42 | * Written by: |
43 | * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. |
44 | */ |
45 | |
46 | ENTRY(bcmp) |
47 | pushl %edi |
48 | pushl %esi |
49 | movl 12(%esp),%edi |
50 | movl 16(%esp),%esi |
51 | movl 20(%esp),%edx |
52 | xorl %eax,%eax /* clear return value */ |
53 | cld /* set compare direction forward */ |
54 | |
55 | movl %edx,%ecx /* compare by words */ |
56 | shrl $2,%ecx |
57 | repe |
58 | cmpsl |
59 | jne L1 |
60 | |
61 | movl %edx,%ecx /* compare remainder by bytes */ |
62 | andl $3,%ecx |
63 | repe |
64 | cmpsb |
65 | je L2 |
66 | |
67 | L1: incl %eax |
68 | L2: popl %esi |
69 | popl %edi |
70 | ret |