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/* $OpenBSD: bcmp.S,v 1.4 2013/07/05 21:11:57 miod Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* 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>
/* Since "cmpc3" is not portable across VAXen, do it the hard way */
/* still, this is four times faster than the generic C version on a uvax2 */
ENTRY(bcmp, 0)
movl 12(%ap),%r0 # r0 = n
jeql 9f
movq 4(%ap),%r1 # r1 = s1, r2 = s2
ashl $-2,%r0,%r3 # convert len to # of long words
jeql 2f
1:
cmpl (%r1)+,(%r2)+ # no "cmpq" alas, so four bytes at a time
jneq 9f
sobgtr %r3,1b
2:
bicl3 $-4,%r0,%r3 # handle at most 3 extra bytes
jeql 8f
3:
cmpb (%r1)+,(%r2)+
jneq 9f
sobgtr %r3,3b
8:
clrl %r0 # we have a match!
9:
ret
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