1991-06-12 20:33:01 +02:00
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/* ffs -- find first set bit in a word, counted from least significant end.
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For mc68020, mc68030, mc68040.
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1997-05-27 00:28:25 +02:00
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This file is part of the GNU C Library.
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2014-01-01 12:03:15 +01:00
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Copyright (C) 1991-2014 Free Software Foundation, Inc.
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1991-06-12 20:33:01 +02:00
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Contributed by Torbjorn Granlund (tege@sics.se).
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1997-05-27 00:28:25 +02:00
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 06:56:23 +02:00
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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1991-06-12 20:33:01 +02:00
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1997-05-27 00:28:25 +02:00
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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2001-07-06 06:56:23 +02:00
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Lesser General Public License for more details.
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1991-06-12 20:33:01 +02:00
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2001-07-06 06:56:23 +02:00
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You should have received a copy of the GNU Lesser General Public
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2012-03-10 00:56:38 +01:00
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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1991-06-12 20:33:01 +02:00
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1998-07-30 14:44:22 +02:00
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#define ffsl __something_else
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1992-05-17 23:05:41 +02:00
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#include <string.h>
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1991-06-12 20:33:01 +02:00
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#undef ffs
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1992-03-12 00:10:11 +01:00
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#if defined (__GNUC__) && defined (__mc68020__)
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1991-06-12 20:33:01 +02:00
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int
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1998-03-09 10:09:46 +01:00
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__ffs (x)
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1997-05-27 00:28:25 +02:00
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int x;
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1991-06-12 20:33:01 +02:00
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{
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int cnt;
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1997-05-27 00:28:25 +02:00
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asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));
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1991-06-12 20:33:01 +02:00
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return 32 - cnt;
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}
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1998-03-09 10:09:46 +01:00
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weak_alias (__ffs, ffs)
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2013-09-20 21:24:53 +02:00
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libc_hidden_def (__ffs)
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2004-07-05 19:36:14 +02:00
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libc_hidden_builtin_def (ffs)
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1998-07-30 14:44:22 +02:00
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#undef ffsl
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weak_alias (__ffs, ffsl)
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1991-06-12 20:33:01 +02:00
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#else
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2005-12-15 22:10:12 +01:00
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#include <string/ffs.c>
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1991-06-12 20:33:01 +02:00
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#endif
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