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index.S revision 1.2 
      1 /*	$NetBSD: index.S,v 1.2 2002/02/24 01:06:20 matt Exp $	*/
      2 /*
      3  * Copyright (c) 1980, 1993
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by the University of
     17  *	California, Berkeley and its contributors.
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 /*
     36  * Find the first occurence of c in the string cp.
     37  * Return pointer to match or null pointer.
     38  *
     39  * char *
     40  * index(cp, c)
     41  *	char *cp, c;
     42  */
     43 #include "DEFS.h"
     44 
     45 /* Alas not quite twice as fast as the generic C version on a uvax2 */
     46 
     47 ENTRY(index, 0)
     48 	movq	4(%ap),%r0	# %r0 = cp; %r1 = c
     49 	tstb	%r1		# special case, looking for '\0'
     50 	jeql	3f
     51 1:
     52 	cmpb	(%r0),%r1
     53 	jeql	2f
     54 	tstb	(%r0)+
     55 	jneq	1b
     56 	clrl	%r0		# return NULL if no match
     57 2:
     58 	ret
     59 3:
     60 	tstb	(%r0)+
     61 	jneq	3b
     62 	decl	%r0
     63 	jbr	2b
     64