Add a forgotten file.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpc/trunk@10 211d60ee-9f03-0410-a15a-8952a2c7a4e4

1 files changed, 37 insertions, 0 deletions

diff --git a/uceil_log2.c b/uceil_log2.c
new file mode 100644
index 0000000..f037437
--- /dev/null
+++ b/uceil_log2.c
@@ -0,0 +1,37 @@
+/* mpc_ceil_log2 - returns ceil(log(d)/log(2))
+
+Copyright 2004 Patrick Pelissier, Paul Zimmermann
+
+This file is part of the MPC Library.
+
+The MPC 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 MPC 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 MPC Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "mpfr.h"
+#include "mpc.h"
+#include "mpc-impl.h"
+
+/* returns ceil(log(d)/log(2)) if d > 0 */
+/* Don't use count_leading_zeros since it is in longlong.h */
+unsigned long
+mpc_ceil_log2 (unsigned long d)
+{
+  unsigned long exp;
+
+  for (exp = 0; d > 1; d = (d + 1) / 2)
+    exp++;
+  return exp;
+}