Home | History | Annotate | Download | only in gen
      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 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 	.file	"wsncmp.s"
     28 
     29 /
     30 / Wide character wcsncpy() implementation
     31 /
     32 / Algorithm based on Solaris 2.6 gen/strncpy.s implementation
     33 /
     34 
     35 #include <sys/asm_linkage.h>
     36 
     37 	ANSI_PRAGMA_WEAK(wcsncmp,function)
     38 	ANSI_PRAGMA_WEAK(wsncmp,function)
     39 
     40 	ENTRY(wcsncmp)		/* (wchar *ws1, wchar_t *ws2, size_t n) */
     41 	cmpq	%rdi,%rsi	/ same string?
     42 	je	.equal
     43 	incq	%rdx		/ will later predecrement this uint
     44 .loop:
     45 	decq	%rdx
     46 	je	.equal		/ Used all n chars?
     47 	movl	(%rdi),%eax	/ slodb ; scab
     48 	cmpl	(%rsi),%eax
     49 	jne	.notequal_0	/ Are the bytes equal?
     50 	testl	%eax,%eax
     51 	je	.equal		/ End of string?
     52 
     53 	decq	%rdx
     54 	je	.equal		/ Used all n chars?
     55 	movl	4(%rdi),%eax	/ slodb ; scab
     56 	cmpl	4(%rsi),%eax
     57 	jne	.notequal_1	/ Are the bytes equal?
     58 	testl	%eax,%eax
     59 	je	.equal		/ End of string?
     60 
     61 	decq	%rdx
     62 	je	.equal		/ Used all n chars?
     63 	movl	8(%rdi),%eax	/ slodb ; scab
     64 	cmpl	8(%rsi),%eax
     65 	jne	.notequal_2	/ Are the bytes equal?
     66 	testl	%eax,%eax
     67 	je	.equal		/ End of string?
     68 
     69 	decq	%rdx
     70 	je	.equal		/ Used all n chars?
     71 	movl	12(%rdi),%eax	/ slodb ; scab
     72 	cmpl	12(%rsi),%eax
     73 	jne	.notequal_3	/ Are the bytes equal?
     74 	addq	$16,%rdi
     75 	addq	$16,%rsi
     76 	testl	%eax,%eax
     77 	jne	.loop		/ End of string?
     78 
     79 .equal:
     80 	xorl	%eax,%eax	/ return 0
     81 	ret
     82 
     83 	.align	4
     84 .notequal_3:
     85 	addq	$4,%rsi
     86 .notequal_2:
     87 	addq	$4,%rsi
     88 .notequal_1:
     89 	addq	$4,%rsi
     90 .notequal_0:
     91 	subl	(%rsi),%eax	/ return value is (*s1 - *--s2)
     92 	ret
     93 	SET_SIZE(wcsncmp)
     94 
     95 	ENTRY(wsncmp)
     96 	jmp	wcsncmp		/ tail call into wcsncmp
     97 	SET_SIZE(wsncmp)
     98