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diff --git a/mpfr/d_sub.c b/mpfr/d_sub.c
new file mode 100644
index 00000000..7306dc33
--- /dev/null
+++ b/mpfr/d_sub.c
@@ -0,0 +1,49 @@
+/* mpfr_d_sub -- subtract a multiple precision floating-point number
+                 from a machine double precision float
+
+Copyright 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao 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 2.1 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.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_d_sub (mpfr_ptr a, double b, mpfr_srcptr c, mp_rnd_t rnd_mode)
+{
+  int inexact;
+  mpfr_t d;
+  MPFR_SAVE_EXPO_DECL (expo);
+
+  MPFR_LOG_FUNC (("b=%.20g c[%#R]=%R rnd=%d", b, c, 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, b, rnd_mode);
+  MPFR_ASSERTN (inexact == 0);
+
+  mpfr_clear_flags ();
+  inexact = mpfr_sub (a, d, c, 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);
+}