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diff --git a/gmp/mpz/get_d_2exp.c b/gmp/mpz/get_d_2exp.c
new file mode 100644
index 00000000..c3cf60c9
--- /dev/null
+++ b/gmp/mpz/get_d_2exp.c
@@ -0,0 +1,45 @@
+/* double mpz_get_d_2exp (signed long int *exp, mpz_t src).
+
+Copyright 2001, 2003, 2004 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 3 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.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+double
+mpz_get_d_2exp (signed long int *exp2, mpz_srcptr src)
+{
+  mp_size_t size, abs_size;
+  mp_srcptr ptr;
+  int cnt;
+  long exp;
+
+  size = SIZ(src);
+  if (UNLIKELY (size == 0))
+    {
+      *exp2 = 0;
+      return 0.0;
+    }
+
+  ptr = PTR(src);
+  abs_size = ABS(size);
+  count_leading_zeros (cnt, ptr[abs_size - 1]);
+  exp = abs_size * GMP_NUMB_BITS - (cnt - GMP_NAIL_BITS);
+  *exp2 = exp;
+  return mpn_get_d (ptr, abs_size, size, -exp);
+}