minix/common/lib/libc/arch/m68k/string/strncmp.S

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/* $NetBSD: strncmp.S,v 1.7 2013/09/07 19:06:29 chs Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Hiroshi Horimoto <horimoto@cs-aoi.cs.sist.ac.jp> and
* by J.T. Conklin <jtc@NetBSD.org>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: strncmp.S,v 1.7 2013/09/07 19:06:29 chs Exp $")
#endif /* LIBC_SCCS and not lint */
#ifdef __mcoldfire__
#define GETC(a,b) mvsb a,b
#define SUBC(a,b) mvsb a,%d2; subl %d2,b
#else
#define GETC(a,b) movb a,b
#define SUBC(a,b) subb a,b
#endif
ENTRY(strncmp)
movl 12(%sp),%d0
jeq .L4
movl 4(%sp),%a0
movl 8(%sp),%a1
#ifdef __coldfire__
movl %d2,-(%sp) | save temp
#endif
.L1: /* unroll by 4 for m680[23]0's */
GETC((%a0)+,%d1)
jeq .L2
SUBC((%a1)+,%d1)
jne .L3
subql #1,%d0
jeq .L4
GETC((%a0)+,%d1)
jeq .L2
SUBC((%a1)+,%d1)
jne .L3
subql #1,%d0
jeq .L4
GETC((%a0)+,%d1)
jeq .L2
SUBC((%a1)+,%d1)
jne .L3
subql #1,%d0
jeq .L4
GETC((%a0)+,%d1)
jeq .L2
SUBC((%a1)+,%d1)
jne .L3
subql #1,%d0
jne .L1
#ifdef __mcoldfire__
movl (%sp)+,%d2 | restore temp
#endif
.L4: rts
.L2: SUBC((%a1),%d1)
.L3:
#ifdef __mcoldfire__
movl (%sp)+,%d2 | restore temp
movl %d1,%d0
#else
scs %d0
EXTBL(%d0)
moveb %d1,%d0
#endif
rts
END(strncmp)