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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 	.file	"strchr.s"
     27 
     28 #include "SYS.h"
     29 
     30 	ENTRY(strchr)		/* (char *, char) */
     31 .loop:
     32 	movb	(%rdi),%dl	/ %dl = byte of string
     33 	cmpb	%sil,%dl	/ find it?
     34 	je	.found		/ yes
     35 	testb	%dl,%dl		/ is it null?
     36 	je	.notfound
     37 
     38 	movb	1(%rdi),%dl	/ %dl = byte of string
     39 	cmpb	%sil,%dl	/ find it?
     40 	je	.found1		/ yes
     41 	testb	%dl,%dl		/ is it null?
     42 	je	.notfound
     43 
     44 	movb	2(%rdi),%dl	/ %dl = byte of string
     45 	cmpb	%sil,%dl	/ find it?
     46 	je	.found2		/ yes
     47 	testb	%dl,%dl		/ is it null?
     48 	je	.notfound
     49 
     50 	movb	3(%rdi),%dl	/ %dl = byte of string
     51 	cmpb	%sil,%dl	/ find it?
     52 	je	.found3		/ yes
     53 	addq	$4,%rdi
     54 	testb	%dl,%dl		/ is it null?
     55 	jne	.loop
     56 
     57 .notfound:
     58 	xorl	%eax,%eax	/ %rax = NULL
     59 	ret
     60 
     61 .found3:
     62 	incq	%rdi
     63 .found2:
     64 	incq	%rdi
     65 .found1:
     66 	incq	%rdi
     67 .found:
     68 	movq	%rdi,%rax
     69 	ret
     70 	SET_SIZE(strchr)
     71