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Bug #1770 » 0001-libc-Add-i386-version-of-fls-using-bsr.patch

vsrinivas, 05/24/2010 03:41 AM

View differences:

lib/libc/i386/string/Makefile.inc
# $FreeBSD: src/lib/libc/i386/string/Makefile.inc,v 1.9 1999/08/27 23:59:29 peter Exp $
# $DragonFly: src/lib/libc/i386/string/Makefile.inc,v 1.2 2003/06/17 04:26:43 dillon Exp $
MDSRCS+=bcmp.S bcopy.S bzero.S ffs.S index.S memchr.S memcmp.S memcpy.S \
MDSRCS+=bcmp.S bcopy.S bzero.S ffs.S fls.S index.S memchr.S memcmp.S memcpy.S \
memmove.S memset.S rindex.S strcat.S strchr.S strcmp.S strcpy.S \
strlen.S strncmp.S strrchr.S swab.S
/dev/null → lib/libc/i386/string/fls.S
/*
* Copyright (c) 2010 The DragonFly Project
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "DEFS.h"
/*
* int fls(int value)
* Finds the highest set bit in a word. Bits are numbered from 1;
* a return of 0 indicates that the word was 0.
*/
ENTRY(fls)
bsrl 4(%esp),%eax
jz 1
addl $1, %eax
ret
1: xorl %eax,%eax
ret
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