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-rw-r--r--sysdeps/rs6000/ffs.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/rs6000/ffs.c b/sysdeps/rs6000/ffs.c
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index 0000000000..4d01727044
--- /dev/null
+++ b/sysdeps/rs6000/ffs.c
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+/* ffs -- find first set bit in a word, counted from least significant end.
+ For IBM rs6000.
+ Copyright (C) 1991, 1992, 1997, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <string.h>
+
+#undef ffs
+
+#ifdef __GNUC__
+
+int
+__ffs (x)
+ int x;
+{
+ int cnt;
+
+ asm ("cntlz %0,%1" : "=r" (cnt) : "r" (x & -x));
+ return 32 - cnt;
+}
+weak_alias (__ffs, ffs)
+libc_hidden_builtin_def (ffs)
+
+#else
+#include <sysdeps/generic/ffs.c>
+#endif