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glibc  2.9
ffs.c
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00001 /* ffs -- find first set bit in a word, counted from least significant end.
00002    For i960 Core architecture
00003    This file is part of the GNU C Library.
00004    Copyright (C) 1994, 1997, 2004, 2005 Free Software Foundation, Inc.
00005    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
00006    On-Line Applications Research Corporation.
00007 
00008    The GNU C Library is free software; you can redistribute it and/or
00009    modify it under the terms of the GNU Lesser General Public
00010    License as published by the Free Software Foundation; either
00011    version 2.1 of the License, or (at your option) any later version.
00012 
00013    The GNU C Library is distributed in the hope that it will be useful,
00014    but WITHOUT ANY WARRANTY; without even the implied warranty of
00015    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016    Lesser General Public License for more details.
00017 
00018    You should have received a copy of the GNU Lesser General Public
00019    License along with the GNU C Library; if not, write to the Free
00020    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00021    02111-1307 USA.  */
00022 
00023 #include <string.h>
00024 
00025 #undef ffs
00026 
00027 #if    defined (__GNUC__) && defined (__i960__)
00028 
00029 int
00030 __ffs (x)
00031      int x;
00032 {
00033   int cnt;
00034 
00035   asm ("scanbit %1,%0" : "=d" (cnt) : "rm" (x & -x));
00036 
00037   return cnt;
00038 }
00039 weak_alias (__ffs, ffs)
00040 libc_hidden_builtin_def (ffs)
00041 
00042 #else
00043 
00044 #include <string/ffs.c>
00045 
00046 #endif