1 files changed, 49 insertions, 0 deletions
diff --git a/src/sub_d.c b/src/sub_d.c
new file mode 100644
index 000000000..c06e45e04
--- /dev/null
+++ b/src/sub_d.c
@@ -0,0 +1,49 @@
+/* mpfr_sub_d -- subtract a machine double precision float from
+                 a multiple precision floating-point number
+
+Copyright 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"
+
+int
+mpfr_sub_d (mpfr_ptr a, mpfr_srcptr b, double c, mpfr_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);
+
+  mpfr_clear_flags ();
+  inexact = mpfr_sub (a, b, d, rnd_mode);
+  MPFR_SAVE_EXPO_UPDATE_FLAGS (expo, __gmpfr_flags);
+
+  mpfr_clear(d);
+  MPFR_SAVE_EXPO_FREE (expo);
+  return mpfr_check_range (a, inexact, rnd_mode);
+}