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index.S revision 1.1.20.1 
      1  1.1.20.1  nathanw /*	$NetBSD: index.S,v 1.1.20.1 2002/03/08 21:34:58 nathanw Exp $	*/
      2       1.1    ragge /*
      3       1.1    ragge  * Copyright (c) 1980, 1993
      4       1.1    ragge  *	The Regents of the University of California.  All rights reserved.
      5       1.1    ragge  *
      6       1.1    ragge  * Redistribution and use in source and binary forms, with or without
      7       1.1    ragge  * modification, are permitted provided that the following conditions
      8       1.1    ragge  * are met:
      9       1.1    ragge  * 1. Redistributions of source code must retain the above copyright
     10       1.1    ragge  *    notice, this list of conditions and the following disclaimer.
     11       1.1    ragge  * 2. Redistributions in binary form must reproduce the above copyright
     12       1.1    ragge  *    notice, this list of conditions and the following disclaimer in the
     13       1.1    ragge  *    documentation and/or other materials provided with the distribution.
     14       1.1    ragge  * 3. All advertising materials mentioning features or use of this software
     15       1.1    ragge  *    must display the following acknowledgement:
     16       1.1    ragge  *	This product includes software developed by the University of
     17       1.1    ragge  *	California, Berkeley and its contributors.
     18       1.1    ragge  * 4. Neither the name of the University nor the names of its contributors
     19       1.1    ragge  *    may be used to endorse or promote products derived from this software
     20       1.1    ragge  *    without specific prior written permission.
     21       1.1    ragge  *
     22       1.1    ragge  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23       1.1    ragge  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24       1.1    ragge  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25       1.1    ragge  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26       1.1    ragge  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27       1.1    ragge  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28       1.1    ragge  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29       1.1    ragge  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30       1.1    ragge  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31       1.1    ragge  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32       1.1    ragge  * SUCH DAMAGE.
     33       1.1    ragge  */
     34       1.1    ragge 
     35       1.1    ragge /*
     36       1.1    ragge  * Find the first occurence of c in the string cp.
     37       1.1    ragge  * Return pointer to match or null pointer.
     38       1.1    ragge  *
     39       1.1    ragge  * char *
     40       1.1    ragge  * index(cp, c)
     41       1.1    ragge  *	char *cp, c;
     42       1.1    ragge  */
     43       1.1    ragge #include "DEFS.h"
     44       1.1    ragge 
     45       1.1    ragge /* Alas not quite twice as fast as the generic C version on a uvax2 */
     46       1.1    ragge 
     47       1.1    ragge ENTRY(index, 0)
     48  1.1.20.1  nathanw 	movq	4(%ap),%r0	# %r0 = cp; %r1 = c
     49  1.1.20.1  nathanw 	tstb	%r1		# special case, looking for '\0'
     50       1.1    ragge 	jeql	3f
     51       1.1    ragge 1:
     52  1.1.20.1  nathanw 	cmpb	(%r0),%r1
     53       1.1    ragge 	jeql	2f
     54  1.1.20.1  nathanw 	tstb	(%r0)+
     55       1.1    ragge 	jneq	1b
     56  1.1.20.1  nathanw 	clrl	%r0		# return NULL if no match
     57       1.1    ragge 2:
     58       1.1    ragge 	ret
     59       1.1    ragge 3:
     60  1.1.20.1  nathanw 	tstb	(%r0)+
     61       1.1    ragge 	jneq	3b
     62  1.1.20.1  nathanw 	decl	%r0
     63       1.1    ragge 	jbr	2b
     64