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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/m68k/ffs.c
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diff --git a/sysdeps/m68k/ffs.c b/sysdeps/m68k/ffs.c
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+/* ffs -- find first set bit in a word, counted from least significant end.
+ For mc68020, mc68030, mc68040.
+ Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+ Contributed by Torbjorn Granlund (tege@sics.se).
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <string.h>
+
+#undef ffs
+
+#if defined (__GNUC__) && defined (__mc68020__)
+
+int
+DEFUN(ffs, (x), int x)
+{
+ int cnt;
+
+ asm("bfffo %1{#0:#0},%0" : "=d" (cnt) : "rm" (x & -x));
+
+ return 32 - cnt;
+}
+
+#else
+
+#include <sysdeps/generic/ffs.c>
+
+#endif