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/*-
* Copyright (c) 2003 Tim J. Robbins.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
/*
* wchar_t *
* wmemchr(const wchar_t *buf, wchar_t c, size_t n) --
* Search the wide character array `buf', which has length `n',
* the character `c', return a pointer to it if found, or NULL on
* failure.
*/
ENTRY(wmemchr)
pushl %edi
pushl %ebx
movl 12(%esp),%edi /* Buffer */
movl 16(%esp),%eax /* Wide character */
movl 20(%esp),%ecx /* Length of buffer */
/*
* Search in chunks of 8 wide characters (32 bytes).
*/
movl %ecx,%ebx
shrl $3,%ecx
jz small
.p2align 4,0x90
bigloop:cmpl %eax,(%edi)
je found
cmpl %eax,4(%edi)
je found4
cmpl %eax,8(%edi)
je found8
cmpl %eax,12(%edi)
je found12
cmpl %eax,16(%edi)
je found16
cmpl %eax,20(%edi)
je found20
cmpl %eax,24(%edi)
je found24
cmpl %eax,28(%edi)
je found28
leal 32(%edi),%edi
decl %ecx
jnz bigloop
jmp small
.p2align 2,0x90
found: movl %edi,%eax
popl %ebx
popl %edi
ret
.p2align 2,0x90
found4: leal 4(%edi),%edi
jmp found
.p2align 2,0x90
found8: leal 8(%edi),%edi
jmp found
.p2align 2,0x90
found12:leal 12(%edi),%edi
jmp found
.p2align 2,0x90
found16:leal 16(%edi),%edi
jmp found
.p2align 2,0x90
found20:leal 20(%edi),%edi
jmp found
.p2align 2,0x90
found24:leal 24(%edi),%edi
jmp found
.p2align 2,0x90
found28:leal 28(%edi),%edi
jmp found
/*
* Search remaining part of string.
*/
.p2align 2,0x90
small: movl %ebx,%ecx
andl $7,%ecx
jz no
smltop: cmpl %eax,(%edi)
je found
leal 4(%edi),%edi
decl %ecx
jnz smltop
.p2align 2,0x90
no: xorl %eax,%eax
popl %ebx
popl %edi
ret
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