NetBSD/lib/libc/arch/m68k/string/strcmp.S

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/* $NetBSD: strcmp.S,v 1.14 1999/10/27 09:10:27 is Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
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* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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)
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RCSID("$NetBSD: strcmp.S,v 1.14 1999/10/27 09:10:27 is Exp $")
#endif /* LIBC_SCCS and not lint */
ENTRY(strcmp)
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movl %sp@(4),%a0
movl %sp@(8),%a1
L1: /* unrolled by 4 for 680[23]0's */
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movb %a0@+,%d1
jeq L2
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subb %a1@+,%d1
jne L3
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movb %a0@+,%d1
jeq L2
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subb %a1@+,%d1
jne L3
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movb %a0@+,%d1
jeq L2
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subb %a1@+,%d1
jne L3
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movb %a0@+,%d1
jeq L2
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subb %a1@+,%d1
jeq L1
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scs %d0
extbl %d0
movb %d1,%d0
rts
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L2: subb %a1@,%d1
L3: scs %d0
extbl %d0
movb %d1,%d0
rts