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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/i386/string/wcslen.S
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/*-

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 * Copyright (c) 2003 Tim J. Robbins.

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 */

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#include <machine/asm.h>

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/*

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 * size_t

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 * wcslen(const wchar_t *s) --

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 *	Find the length of a wide character string.

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 */

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ENTRY(wcslen)

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	movl	4(%esp),%ecx		/* String */

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	pushl	%ebx

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	xorl	%ebx,%ebx

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	xorl	%eax,%eax

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.p2align 4,0x90

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L1:	cmpl	%ebx,(%ecx)

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	jz	found0

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	cmpl	%ebx,4(%ecx)

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	jz	found1

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	cmpl	%ebx,8(%ecx)

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	jz	found2

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	cmpl	%ebx,12(%ecx)

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	jz	found3

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	cmpl	%ebx,16(%ecx)

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	jz	found4

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	cmpl	%ebx,20(%ecx)

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	jz	found5

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	cmpl	%ebx,24(%ecx)

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	jz	found6

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	cmpl	%ebx,28(%ecx)

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	jz	found7

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	leal	32(%ecx),%ecx

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	addl	$8,%eax

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	jmp	L1

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found7:	incl	%eax

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found6:	incl	%eax

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found5:	incl	%eax

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found4:	incl	%eax

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found3:	incl	%eax

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found2:	incl	%eax

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found1:	incl	%eax

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found0:	popl	%ebx

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	ret

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END(wcslen)

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	.section .note.GNU-stack,"",%progbits

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