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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/i386/string/bcmp.S
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/*

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 * Copyright (c) 1993 Winning Strategies, Inc.

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 * 3. All advertising materials mentioning features or use of this software

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 *    must display the following acknowledgement:

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 *      This product includes software developed by Winning Strategies, Inc.

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 * 4. The name of the author may not be used to endorse or promote products

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 *    derived from this software without specific prior written permission

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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 */

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#include <machine/asm.h>

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/*

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 * bcmp (void *b1, void *b2, size_t len)

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 *

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 * Written by:

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 *	J.T. Conklin ([email protected]), Winning Strategies, Inc.

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 */

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ENTRY(bcmp)

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	pushl	%edi

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	pushl	%esi

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	movl	12(%esp),%edi

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	movl	16(%esp),%esi

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	cld				/* set compare direction forward */

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	movl	20(%esp),%ecx		/* compare by words */

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	shrl	$2,%ecx

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	repe

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	cmpsl

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	jne	L1

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	movl	20(%esp),%ecx		/* compare remainder by bytes */

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	andl	$3,%ecx

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	repe

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	cmpsb

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L1:

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	setne	%al

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	movsbl	%al,%eax

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	popl	%esi

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	popl	%edi

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	ret

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END(bcmp)

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	.section .note.GNU-stack,"",%progbits

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