1/*        $NetBSD: strncmp.S,v 1.7 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 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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <machine/asm.h>
34
35#if defined(LIBC_SCCS) && !defined(lint)
36          RCSID("$NetBSD: strncmp.S,v 1.7 2013/09/07 19:06:29 chs Exp $")
37#endif /* LIBC_SCCS and not lint */
38
39
40#ifdef __mcoldfire__
41#define GETC(a,b)   mvsb      a,b
42#define   SUBC(a,b) mvsb      a,%d2; subl %d2,b
43#else
44#define GETC(a,b)   movb      a,b
45#define   SUBC(a,b) subb      a,b
46#endif
47
48ENTRY(strncmp)
49          movl      12(%sp),%d0
50          jeq       .L4
51          movl      4(%sp),%a0
52          movl      8(%sp),%a1
53#ifdef __coldfire__
54          movl      %d2,-(%sp)          | save temp
55#endif
56.L1:                                    /* unroll by 4 for m680[23]0's */
57          GETC((%a0)+,%d1)
58          jeq       .L2
59          SUBC((%a1)+,%d1)
60          jne       .L3
61          subql     #1,%d0
62          jeq       .L4
63
64          GETC((%a0)+,%d1)
65          jeq       .L2
66          SUBC((%a1)+,%d1)
67          jne       .L3
68          subql     #1,%d0
69          jeq       .L4
70
71          GETC((%a0)+,%d1)
72          jeq       .L2
73          SUBC((%a1)+,%d1)
74          jne       .L3
75          subql     #1,%d0
76          jeq       .L4
77
78          GETC((%a0)+,%d1)
79          jeq       .L2
80          SUBC((%a1)+,%d1)
81          jne       .L3
82          subql     #1,%d0
83          jne       .L1
84#ifdef __mcoldfire__
85          movl      (%sp)+,%d2                    | restore temp
86#endif
87.L4:      rts
88
89.L2:      SUBC((%a1),%d1)
90.L3:
91#ifdef __mcoldfire__
92          movl      (%sp)+,%d2                    | restore temp
93          movl      %d1,%d0
94#else
95          scs       %d0
96          EXTBL(%d0)
97          moveb     %d1,%d0
98#endif
99          rts
100END(strncmp)
101