2003-03-12 03:55:01 +00:00
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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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__FBSDID("$FreeBSD$");
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/*
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* wchar_t *
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* wmemchr(const wchar_t *buf, wchar_t c, size_t n) --
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* Search the wide character array `buf', which has length `n',
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* the character `c', return a pointer to it if found, or NULL on
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* failure.
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*/
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ENTRY(wmemchr)
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pushl %edi
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pushl %ebx
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movl 12(%esp),%edi /* Buffer */
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movl 16(%esp),%eax /* Wide character */
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movl 20(%esp),%ecx /* Length of buffer */
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/*
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* Search in chunks of 8 wide characters (32 bytes).
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*/
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movl %ecx,%ebx
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shrl $3,%ecx
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jz small
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.p2align 4,0x90
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bigloop:cmpl %eax,(%edi)
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je found
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cmpl %eax,4(%edi)
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je found4
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cmpl %eax,8(%edi)
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je found8
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cmpl %eax,12(%edi)
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je found12
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cmpl %eax,16(%edi)
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je found16
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cmpl %eax,20(%edi)
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je found20
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cmpl %eax,24(%edi)
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je found24
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cmpl %eax,28(%edi)
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je found28
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leal 32(%edi),%edi
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decl %ecx
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jnz bigloop
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jmp small
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found: movl %edi,%eax
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popl %ebx
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popl %edi
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ret
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found4: leal 4(%edi),%edi
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jmp found
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found8: leal 8(%edi),%edi
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jmp found
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found12:leal 12(%edi),%edi
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jmp found
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found16:leal 16(%edi),%edi
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jmp found
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found20:leal 20(%edi),%edi
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jmp found
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found24:leal 24(%edi),%edi
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jmp found
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found28:leal 28(%edi),%edi
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jmp found
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/*
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* Search remaining part of string.
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*/
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small: movl %ebx,%ecx
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andl $7,%ecx
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jz no
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2003-03-12 06:46:16 +00:00
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.p2align 2,0x90
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2003-03-12 03:55:01 +00:00
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smltop: cmpl %eax,(%edi)
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je found
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leal 4(%edi),%edi
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decl %ecx
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jnz smltop
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no: xorl %eax,%eax
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popl %ebx
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popl %edi
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ret
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