File renaming.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@1714 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 40 insertions, 0 deletions

diff --git a/uceil_log2.c b/uceil_log2.c
new file mode 100644
index 000000000..9decc009f
--- /dev/null
+++ b/uceil_log2.c
@@ -0,0 +1,40 @@
+/* _mpfr_ceil_log2 - returns ceil(log(d)/log(2))
+
+Copyright 1999, 2000, 2001, 2002 Free Software Foundation.
+
+This file is part of the MPFR Library.
+
+The MPFR 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 MPFR 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 MPFR 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 "gmp-impl.h"
+#include "mpfr.h"
+#include "mpfr-impl.h"
+
+/* returns ceil(log(d)/log(2)) */
+long
+_mpfr_ceil_log2 (double d)
+{
+  long exp;
+  union ieee_double_extract x;
+
+  x.d = d;
+  exp = x.s.exp - 1023;
+  x.s.exp = 1023; /* value for 1 <= d < 2 */
+  if (x.d != 1.0) /* d: not a power of two? */
+    exp++;
+  return exp;
+}