New module 'remainderf'.

[gnulib.git] / lib / remainderf.c

diff --git a/lib/remainderf.c b/lib/remainderf.c
new file mode 100644 (file)
index 0000000..5d9ddb8
--- /dev/null
+++ b/lib/remainderf.c
@@ -0,0 +1,31 @@
+/* Remainder.
+   Copyright (C) 2012 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>
+
+float
+remainderf (float x, float y)
+{
+#if HAVE_REMAINDER
+  return (float) remainder ((double) x, (double) y);
+#else
+  float i = roundf (x / y);
+  return fmaf (- i, y, x);
+#endif
+}