Net2/usr/src/lib/libc/tahoe/string/memcmp.s

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/*
 * Copyright (c) 1988 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.
 *
 * This code is derived from software contributed to Berkeley by
 * Computer Consoles Inc.
 */

#if defined(LIBC_SCCS) && !defined(lint)
	.asciz "@(#)memcmp.s	5.2 (Berkeley) 6/1/90"
#endif /* LIBC_SCCS and not lint */

/*
 * int
 * memcmp(s1, s2, n)
 *	void const *s1, const *s2;
 *	size_t n;
 *
 * Compare up to n bytes from s1/s2.
 * Return
 *	= 0 if s1 == s2
 *	< 0 if s1 < s2		(unsigned character comparison)
 *	> 0 if s1 > s2
 */
#include "DEFS.h"

ENTRY(memcmp, 0)
	movl	4(fp),r0
	movl	8(fp),r1
	mnegl	12(fp),r2
	jeql	2f
1:
	cmpb	(r0),(r1)
	jneq	3f
	incl	r0
	incl	r1
	aoblss	$0,r2,1b
2:
	clrl	r0
	ret
3:
	jlssu	4f
	movl	$1,r0
	ret
4:
	mnegl	$1,r0
	ret