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diff --git a/mpf/get_d_2exp.c b/mpf/get_d_2exp.c
new file mode 100644
index 000000000..92e3a2edc
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+++ b/mpf/get_d_2exp.c
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+/* double mpf_get_d_2exp (signed long int *exp, mpf_t src).
+
+Copyright 2001 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 MP 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 MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+double
+mpf_get_d_2exp (signed long int *exp2, mpf_srcptr src)
+{
+  double res;
+  mp_size_t size, i, n_limbs_to_use;
+  int negative;
+  mp_ptr qp;
+  int cnt;
+
+  size = SIZ(src);
+  if (size == 0)
+    {
+      *exp2 = 0;
+      return 0.0;
+    }
+
+  negative = size < 0;
+  size = ABS (size);
+  qp = PTR(src);
+
+  n_limbs_to_use = MIN (LIMBS_PER_DOUBLE, size);
+  qp += size - n_limbs_to_use;
+  res = qp[0] / MP_BASE_AS_DOUBLE;
+  for (i = 1; i < n_limbs_to_use; i++)
+    res = (res + qp[i]) / MP_BASE_AS_DOUBLE;
+  count_leading_zeros (cnt, qp[n_limbs_to_use - 1]);
+  *exp2 = EXP(src) * BITS_PER_MP_LIMB - cnt;
+  res = res * ((mp_limb_t) 1 << cnt);
+
+  return negative ? -res : res;
+}