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bcmp.S revision 1.5 
      1 /*
      2  * Copyright (c) 1993 Winning Strategies, Inc.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *      This product includes software developed by Winning Strategies, Inc.
     16  * 4. The name of the author may not be used to endorse or promote products
     17  *    derived from this software without specific prior written permission
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  *
     30  *	$Id: bcmp.S,v 1.5 1994/03/22 01:15:47 jtc Exp $
     31  */
     32 
     33 #include <machine/asm.h>
     34 
     35 #if defined(LIBC_SCCS)
     36 	RCSID("$Id: bcmp.S,v 1.5 1994/03/22 01:15:47 jtc Exp $")
     37 #endif
     38 
     39 /*
     40  * bcmp (void *b1, void *b2, size_t len)
     41  *
     42  * Written by:
     43  *	J.T. Conklin (jtc (at) wimsey.com), Winning Strategies, Inc.
     44  */
     45 
     46 ENTRY(bcmp)
     47 	pushl	%edi
     48 	pushl	%esi
     49 	movl	12(%esp),%edi
     50 	movl	16(%esp),%esi
     51 	xorl	%eax,%eax		/* clear return value */
     52 	cld				/* set compare direction forward */
     53 
     54 	movl	20(%esp),%ecx		/* compare by words */
     55 	shrl	$2,%ecx
     56 	repe
     57 	cmpsl
     58 	jne	L1
     59 
     60 	movl	20(%esp),%ecx		/* compare remainder by bytes */
     61 	andl	$3,%ecx
     62 	repe
     63 	cmpsb
     64 	je	L2
     65 
     66 L1:	incl	%eax
     67 L2:	popl	%esi
     68 	popl	%edi
     69 	ret
     70