1 files changed, 48 insertions, 0 deletions
diff --git a/src/dim.c b/src/dim.c
new file mode 100644
index 000000000..078a69e03
--- /dev/null
+++ b/src/dim.c
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+/* mpfr_dim -- positive difference
+
+Copyright 2001, 2002, 2004, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+Contributed by the Arenaire and Caramel projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU 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 3 of the License, or (at your
+option) any later version.
+
+The GNU 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 GNU MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+/* dim (x,y) is defined as:
+
+    x-y if x >  y
+    +0    if x <= y
+*/
+
+int
+mpfr_dim (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mpfr_rnd_t rnd_mode)
+{
+  if (MPFR_IS_NAN(x) || MPFR_IS_NAN(y))
+    {
+      MPFR_SET_NAN(z);
+      MPFR_RET_NAN;
+    }
+
+  if (mpfr_cmp (x,y) > 0)
+    return mpfr_sub (z, x, y, rnd_mode);
+  else
+    {
+      MPFR_SET_ZERO(z);
+      MPFR_SET_POS(z);
+      MPFR_RET(0);
+    }
+}