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bcmp.S revision 1.3 
      1 /*	$NetBSD: bcmp.S,v 1.3 2020/05/05 06:20:55 skrll Exp $	*/
      2 
      3 /*	$OpenBSD: bcmp.S,v 1.3 2001/06/04 23:14:02 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright 1996 1995 by Open Software Foundation, Inc.
      7  *              All Rights Reserved
      8  *
      9  * Permission to use, copy, modify, and distribute this software and
     10  * its documentation for any purpose and without fee is hereby granted,
     11  * provided that the above copyright notice appears in all copies and
     12  * that both the copyright notice and this permission notice appear in
     13  * supporting documentation.
     14  *
     15  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
     16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     17  * FOR A PARTICULAR PURPOSE.
     18  *
     19  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
     20  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
     21  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
     22  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
     23  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     24  */
     25 /*
     26  *  (c) Copyright 1988 HEWLETT-PACKARD COMPANY
     27  *
     28  *  To anyone who acknowledges that this file is provided "AS IS"
     29  *  without any express or implied warranty:
     30  *      permission to use, copy, modify, and distribute this file
     31  *  for any purpose is hereby granted without fee, provided that
     32  *  the above copyright notice and this notice appears in all
     33  *  copies, and that the name of Hewlett-Packard Company not be
     34  *  used in advertising or publicity pertaining to distribution
     35  *  of the software without specific, written prior permission.
     36  *  Hewlett-Packard Company makes no representations about the
     37  *  suitability of this software for any purpose.
     38  */
     39 /*
     40  * Copyright (c) 1990,1991,1994 The University of Utah and
     41  * the Computer Systems Laboratory (CSL).  All rights reserved.
     42  *
     43  * THE UNIVERSITY OF UTAH AND CSL PROVIDE THIS SOFTWARE IN ITS "AS IS"
     44  * CONDITION, AND DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES
     45  * WHATSOEVER RESULTING FROM ITS USE.
     46  *
     47  * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any
     48  * improvements that they make and grant CSL redistribution rights.
     49  *
     50  * 	Utah Hdr: movc.s 1.26 94/12/14
     51  */
     52 
     53 #include <machine/asm.h>
     54 
     55 #ifdef SYSLIBC_SCCS
     56 	.text
     57 	.asciz "$OpenBSD: bcmp.S,v 1.3 2001/06/04 23:14:02 mickey Exp $"
     58 	.align	4
     59 #endif
     60 
     61 /*
     62  * int
     63  * bcmp(src, dst, count)
     64  *	vaddr_t	src;
     65  *	vaddr_t	dst;
     66  *	size_t	count;
     67  */
     68 LEAF_ENTRY(bcmp)
     69         comb,>= %r0,%arg2,$bcmp_exit
     70 	copy	%t1,%t2
     71 
     72 $bcmp_loop:
     73 	ldbs,ma	1(%arg0),%t1
     74 	ldbs,ma	1(%arg1),%t2
     75 	comb,<>,n %t1,%t2,$bcmp_exit
     76 	addib,<> -1,%arg2,$bcmp_loop
     77 	 nop
     78 
     79 $bcmp_exit:
     80 	bv	0(%r2)
     81 	 sub	%t1,%t2,%ret0
     82 
     83 EXIT(bcmp)
     84 
     85