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/* $NetBSD: bcmp.S,v 1.6 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 J.T. Conklin.
*
* 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.
*/
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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. Neither the name of the University 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 REGENTS 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 REGENTS 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)
#if 0
RCSID("from: @(#)bcmp.s 5.1 (Berkeley) 5/12/90")
#else
RCSID("$NetBSD: bcmp.S,v 1.6 2013/09/07 19:06:29 chs Exp $")
#endif
#endif /* LIBC_SCCS and not lint */
#ifdef __mcoldfire__
#define CMPMB(a,b) movb b,%d2; cmpb a,%d2
#define CMPMW(a,b) movw b,%d2; cmpw a,%d2
#define CMPML(a,b) movl b,%d2; cmpl a,%d2
#else
#define CMPMB(a,b) cmpmb a,b
#define CMPMW(a,b) cmpmw a,b
#define CMPML(a,b) cmpml a,b
#endif
ENTRY(bcmp)
movl 4(%sp),%a0 | string 1
movl 8(%sp),%a1 | string 2
movl 12(%sp),%d1 | length
#ifdef __mcoldfire__
movl %d2,-(%sp) | save temp
#endif
/*
* It isn't worth the overhead of aligning to {long}word boundries
* if the string is too short.
*/
cmpl #8,%d1
jlt .Lbcbyte
#ifdef __mc68010__
/*
* The 68010 cannot access a word or long on an odd boundary,
* period. If the source and the destination addresses aren't
* of the same evenness, we're forced to do a bytewise compare.
*/
movl %a0,%d0
addl %a1,%d0
btst #0,%d0
jne .Lbcbyte
#endif /* __mc68010__ */
/* word align */
movl %a0,%d0
btst #0,%d0
jeq .Lbcalgndw
CMPMB((%a0)+,(%a1)+)
jne .Lbcnoteq
subql #1,%d1
.Lbcalgndw:
/* long word align */
btst #1,%d0
jeq .Lbcalgndl
CMPMW((%a0)+,(%a1)+)
jne .Lbcnoteq
subql #2,%d1
.Lbcalgndl:
/* compare by 8 longwords */
movl %d1,%d0
lsrl #5,%d0 | cnt = len / 32
jeq .Lbclong | if (cnt)
andl #31,%d1 | len %= 32
subql #1,%d0 | set up for dbf
.Lbc32loop:
CMPML((%a0)+,(%a1)+) | compare 1 of 8 longwords
jne .Lbcnoteq | not equal, return non-zero
CMPML((%a0)+,(%a1)+) | compare 2 of 8 longwords
jne .Lbcnoteq
CMPML((%a0)+,(%a1)+) | compare 3 of 8 longwords
jne .Lbcnoteq
CMPML((%a0)+,(%a1)+) | compare 4 of 8 longwords
jne .Lbcnoteq
CMPML((%a0)+,(%a1)+) | compare 5 of 8 longwords
jne .Lbcnoteq
CMPML((%a0)+,(%a1)+) | compare 6 of 8 longwords
jne .Lbcnoteq
CMPML((%a0)+,(%a1)+) | compare 7 of 8 longwords
jne .Lbcnoteq
CMPML((%a0)+,(%a1)+) | compare 8 of 8 longwords
jne .Lbcnoteq
#ifndef __mcoldfire__
dbf %d0,.Lbc32loop | till done
clrw %d0
#endif
subql #1,%d0
jcc .Lbc32loop
.Lbclong:
/* compare by longwords */
movl %d1,%d0
lsrl #2,%d0 | cnt = len / 4
jeq .Lbcbyte | if (cnt)
subql #1,%d0 | set up for dbf
.Lbclloop:
CMPML((%a0)+,(%a1)+) | compare a longword
jne .Lbcnoteq | not equal, return non-zero
#ifdef __mcoldfire__
subql #1,%d0 | decrement
jcc .Lbclloop | till done
#else
dbf %d0,.Lbclloop | till done
#endif
andl #3,%d1 | len %= 4
jeq .Lbcdone
subql #1,%d1 | set up for dbf
.Lbcbloop:
CMPMB((%a0)+,(%a1)+) | compare a byte
jne .Lbcnoteq | not equal, return non-zero
.Lbcbyte:
#ifdef __mcoldfire__
subql #1,%d0 | decrement
jcc .Lbcbloop | till done
#else
dbf %d1,.Lbcbloop
#endif
.Lbcdone:
#ifdef __mcoldfire__
movl (%sp)+,%d2 | restore temp
#endif
movql #0,%d0
rts
.Lbcnoteq:
movql #1,%d0
rts
END(bcmp)
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