new arithmetic functions with a double argument

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@4832 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 52 insertions, 0 deletions

diff --git a/div_d.c b/div_d.c
new file mode 100644
index 000000000..49ce9f85c
--- /dev/null
+++ b/div_d.c
@@ -0,0 +1,52 @@
+/* mpfr_div_d -- divide a multiple precision floating-point number
+                 by a machine double precision float
+
+Copyright 2007 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+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., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include "mpfr-impl.h"
+
+int
+mpfr_div_d (mpfr_ptr a, mpfr_srcptr b, double c, mp_rnd_t rnd_mode)
+{
+  int inexact;
+  mpfr_t d;
+  MPFR_SAVE_EXPO_DECL (expo);
+
+  MPFR_LOG_FUNC (("b[%#R]=%R c%.20g rnd=%d", b, b, c, rnd_mode),
+                 ("a[%#R]=%R", a, a));
+
+  MPFR_SAVE_EXPO_MARK (expo);
+
+  mpfr_init2 (d, IEEE_DBL_MANT_DIG);
+  inexact = mpfr_set_d (d, c, rnd_mode);
+  MPFR_ASSERTN (inexact == 0);
+
+  inexact = mpfr_div (a, b, d, rnd_mode);
+  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (a)))
+    {
+      MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags);
+    }
+
+
+  mpfr_clear(d);
+  MPFR_SAVE_EXPO_FREE (expo);
+  return mpfr_check_range (a, inexact, rnd_mode);
+}