New module 'ldexpf'.

[gnulib.git] / lib / ldexpf.c

diff --git a/lib/ldexpf.c b/lib/ldexpf.c
new file mode 100644 (file)
index 0000000..0460d1a
--- /dev/null
+++ b/lib/ldexpf.c
@@ -0,0 +1,31 @@
+/* Multiply a 'float' by a power of 2.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <math.h>
+
+/* Avoid some warnings from "gcc -Wshadow".
+   This file doesn't use the exp() function.  */
+#undef exp
+#define exp exponent
+
+float
+ldexpf (float x, int exp)
+{
+  return (float) ldexp ((double) x, exp);
+}