strcmp.S revision 1.1 
1/*	$NetBSD: strcmp.S,v 1.1 2005/12/20 19:28:49 christos 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 Hiroshi Horimoto <horimoto@cs-aoi.cs.sist.ac.jp> and
9 * by J.T. Conklin <jtc@NetBSD.org>.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *        This product includes software developed by the NetBSD
22 *        Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 *    contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40#include <machine/asm.h>
41
42#if defined(LIBC_SCCS) && !defined(lint)
43	RCSID("$NetBSD: strcmp.S,v 1.1 2005/12/20 19:28:49 christos Exp $")
44#endif /* LIBC_SCCS and not lint */
45
46ENTRY(strcmp)
47	movl	%sp@(4),%a0
48	movl	%sp@(8),%a1
49L1:				/* unrolled by 4 for 680[23]0's */
50	movb	%a0@+,%d1
51	jeq	L2
52	subb	%a1@+,%d1
53	jne	L3
54
55	movb	%a0@+,%d1
56	jeq	L2
57	subb	%a1@+,%d1
58	jne	L3
59
60	movb	%a0@+,%d1
61	jeq	L2
62	subb	%a1@+,%d1
63	jne	L3
64
65	movb	%a0@+,%d1
66	jeq	L2
67	subb	%a1@+,%d1
68	jeq	L1
69
70L3:	scs	%d0
71	EXTBL(%d0)
72	movb	%d1,%d0
73	rts
74
75L2:	movq	#0,%d0
76	movb	%a1@,%d0
77	negl	%d0
78	rts
79