NetBSD/lib/libc/arch/vax/string/bcmp.S

63 lines
2.4 KiB
ArmAsm

/* $NetBSD: bcmp.S,v 1.1 1996/05/19 15:57:38 ragge 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
/* bcmp(s1, s2, n) */
#include "DEFS.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