Home | History | Annotate | Line # | Download | only in string
index.S revision 1.6 
      1  1.6  msaitoh /*	$NetBSD: index.S,v 1.6 2020/09/29 02:58:51 msaitoh 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  1.3      agc  * 3. Neither the name of the University nor the names of its contributors
     15  1.1    ragge  *    may be used to endorse or promote products derived from this software
     16  1.1    ragge  *    without specific prior written permission.
     17  1.1    ragge  *
     18  1.1    ragge  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19  1.1    ragge  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20  1.1    ragge  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21  1.1    ragge  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22  1.1    ragge  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  1.1    ragge  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24  1.1    ragge  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  1.1    ragge  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  1.1    ragge  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  1.1    ragge  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  1.1    ragge  * SUCH DAMAGE.
     29  1.1    ragge  */
     30  1.1    ragge 
     31  1.1    ragge /*
     32  1.6  msaitoh  * Find the first occurrence of c in the string cp.
     33  1.1    ragge  * Return pointer to match or null pointer.
     34  1.1    ragge  *
     35  1.1    ragge  * char *
     36  1.1    ragge  * index(cp, c)
     37  1.1    ragge  *	char *cp, c;
     38  1.1    ragge  */
     39  1.1    ragge #include "DEFS.h"
     40  1.1    ragge 
     41  1.4     matt #ifdef LIBC_SCCS
     42  1.6  msaitoh RCSID("$NetBSD: index.S,v 1.6 2020/09/29 02:58:51 msaitoh Exp $")
     43  1.4     matt #endif
     44  1.4     matt 
     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  1.2     matt 	movq	4(%ap),%r0	# %r0 = cp; %r1 = c
     49  1.2     matt 	tstb	%r1		# special case, looking for '\0'
     50  1.1    ragge 	jeql	3f
     51  1.1    ragge 1:
     52  1.2     matt 	cmpb	(%r0),%r1
     53  1.1    ragge 	jeql	2f
     54  1.2     matt 	tstb	(%r0)+
     55  1.1    ragge 	jneq	1b
     56  1.2     matt 	clrl	%r0		# return NULL if no match
     57  1.1    ragge 2:
     58  1.1    ragge 	ret
     59  1.1    ragge 3:
     60  1.2     matt 	tstb	(%r0)+
     61  1.1    ragge 	jneq	3b
     62  1.2     matt 	decl	%r0
     63  1.1    ragge 	jbr	2b
     64  1.4     matt END(index)
     65