generic-library/bionic
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

am 4b832714: am 97288549: Merge "Let the compiler worry about implementing ffs(3)."

Browse Source 
* commit '4b83271437727fcc2b2400b5c81dc4d3cbb7391e':
  Let the compiler worry about implementing ffs(3).
This commit is contained in:
Elliott Hughes
2013-10-24 16:41:34 -07:00
committed by Android Git Automerger
parent 322ae56a95 4b83271437
commit c55f980d23
10 changed files with 40 additions and 179 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
libc/arch-arm/arm.mk
View File

@@ -4,7 +4,6 @@ _LIBC_ARCH_COMMON_SRC_FILES := \
arch-arm/bionic/clone.S \
arch-arm/bionic/eabi.c \
arch-arm/bionic/_exit_with_stack_teardown.S \
arch-arm/bionic/ffs.S \
arch-arm/bionic/futex_arm.S \
arch-arm/bionic/__get_sp.S \
arch-arm/bionic/kill.S \

41
libc/arch-arm/bionic/ffs.S
View File

@@ -1,41 +0,0 @@
/* $NetBSD: ffs.S,v 1.5 2003/04/05 23:08:52 bjh21 Exp $ */
/*
* Copyright (c) 2001 Christopher Gilbert
* 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 company nor the name of the author may be used to
* endorse or promote products derived from this software without 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 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>
#include <machine/cpu-features.h>
ENTRY(ffs)
/* Standard trick to isolate bottom bit in r0 or 0 if r0 = 0 on entry */
rsb r1, r0, #0
ands r0, r0, r1
clzne r0, r0
rsbne r0, r0, #32
bx lr
END(ffs)