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

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/* $NetBSD: strcmp.S,v 1.2 2008/04/28 20:22:52 martin 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: strcmp.S,v 1.2 2008/04/28 20:22:52 martin Exp $")
#endif /* LIBC_SCCS and not lint */
ENTRY(strcmp)
movl %sp@(4),%a0
movl %sp@(8),%a1
L1: /* unrolled by 4 for 680[23]0's */
movb %a0@+,%d1
jeq L2
subb %a1@+,%d1
jne L3
movb %a0@+,%d1
jeq L2
subb %a1@+,%d1
jne L3
movb %a0@+,%d1
jeq L2
subb %a1@+,%d1
jne L3
movb %a0@+,%d1
jeq L2
subb %a1@+,%d1
jeq L1
L3: scs %d0
EXTBL(%d0)
movb %d1,%d0
rts
L2: movq #0,%d0
movb %a1@,%d0
negl %d0
rts