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diff --git a/mpfr/tests/tget_set_d64.c b/mpfr/tests/tget_set_d64.c
new file mode 100644
index 00000000..97784f46
--- /dev/null
+++ b/mpfr/tests/tget_set_d64.c
@@ -0,0 +1,249 @@
+/* Test file for mpfr_get_decimal64 and mpfr_set_decimal64.
+
+Copyright 2006, 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 <stdlib.h> /* for exit */
+#include "mpfr-test.h"
+
+/* #define DEBUG */
+
+#ifdef MPFR_WANT_DECIMAL_FLOATS
+static void
+print_decimal64 (_Decimal64 d)
+{
+  union ieee_double_extract x;
+  union ieee_double_decimal64 y;
+  unsigned int Gh, i;
+
+  y.d64 = d;
+  x.d = y.d;
+  Gh = x.s.exp >> 6;
+  printf ("|%d%d%d%d%d%d", x.s.sig, Gh >> 4, (Gh >> 3) & 1,
+          (Gh >> 2) & 1, (Gh >> 1) & 1, Gh & 1);
+  printf ("%d%d%d%d%d%d", (x.s.exp >> 5) & 1, (x.s.exp >> 4) & 1,
+          (x.s.exp >> 3) & 1, (x.s.exp >> 2) & 1, (x.s.exp >> 1) & 1,
+          x.s.exp & 1);
+  for (i = 20; i > 0; i--)
+    printf ("%d", (x.s.manh >> (i - 1)) & 1);
+  for (i = 32; i > 0; i--)
+    printf ("%d", (x.s.manl >> (i - 1)) & 1);
+  printf ("|\n");
+}
+
+static void
+check_inf_nan (void)
+{
+  mpfr_t  x, y;
+  _Decimal64 d;
+
+  mpfr_init2 (x, 123);
+  mpfr_init2 (y, 123);
+
+  mpfr_set_nan (x);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 1, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_nan_p (x));
+
+  mpfr_set_inf (x, 1);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 1, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_inf_p (x) && mpfr_sgn (x) > 0);
+
+  mpfr_set_inf (x, -1);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 1, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_inf_p (x) && mpfr_sgn (x) < 0);
+
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 1, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp_ui (x, 0) == 0 && MPFR_SIGN (x) > 0);
+
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_neg (x, x, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 1, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp_ui (x, 0) == 0 && MPFR_SIGN (x) < 0);
+
+  mpfr_set_ui (x, 1, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp_ui (x, 1) == 0);
+
+  mpfr_set_si (x, -1, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp_si (x, -1) == 0);
+
+  mpfr_set_ui (x, 2, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp_ui (x, 2) == 0);
+
+  mpfr_set_ui (x, 99, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp_ui (x, 99) == 0);
+
+  mpfr_set_str (x, "9999999999999999", 10, GMP_RNDZ);
+  mpfr_set (y, x, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  /* smallest normal number */
+  mpfr_set_str (x, "1E-383", 10, GMP_RNDU);
+  mpfr_set (y, x, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDU);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  /* smallest subnormal number */
+  mpfr_set_str (x, "1E-398", 10, GMP_RNDU);
+  mpfr_set (y, x, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDU);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  /* subnormal number with exponent change when we round back
+     from 16 digits to 1 digit */
+  mpfr_set_str (x, "9.9E-398", 10, GMP_RNDN);
+  d = mpfr_get_decimal64 (x, GMP_RNDU); /* should be 1E-397 */
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDD);
+  mpfr_set_str (y, "1E-397", 10, GMP_RNDN);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  /* largest number */
+  mpfr_set_str (x, "9.999999999999999E384", 10, GMP_RNDZ);
+  mpfr_set (y, x, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDU);
+  mpfr_set_ui (x, 0, GMP_RNDZ);
+  mpfr_set_decimal64 (x, d, GMP_RNDZ);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  mpfr_set_prec (x, 53);
+  mpfr_set_prec (y, 53);
+
+  /* largest number */
+  mpfr_set_str (x, "9.999999999999999E384", 10, GMP_RNDZ);
+  d = mpfr_get_decimal64 (x, GMP_RNDZ);
+  mpfr_set_decimal64 (y, d, GMP_RNDU);
+  ASSERT_ALWAYS (mpfr_cmp (x, y) == 0);
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+}
+
+static void
+check_random (void)
+{
+  mpfr_t  x, y;
+  _Decimal64 d;
+  int i;
+
+  mpfr_init2 (x, 49);
+  mpfr_init2 (y, 49);
+
+  for (i = 0; i < 100000; i++)
+    {
+      mpfr_urandomb (x, RANDS); /* 0 <= x < 1 */
+      /* the normal decimal64 range contains [2^(-1272), 2^1278] */
+      mpfr_mul_2si (x, x, (i % 2550) - 1272, GMP_RNDN);
+      if (mpfr_get_exp (x) <= -1272)
+        mpfr_mul_2exp (x, x, -1271 - mpfr_get_exp (x), GMP_RNDN);
+      d = mpfr_get_decimal64 (x, GMP_RNDN);
+      mpfr_set_decimal64 (y, d, GMP_RNDN);
+      if (mpfr_cmp (x, y) != 0)
+        {
+          printf ("x="); mpfr_dump (x);
+          printf ("d="); print_decimal64 (d);
+          printf ("y="); mpfr_dump (y);
+          exit (1);
+        }
+    }
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+}
+
+/* check with native decimal formats */
+static void
+check_native (void)
+{
+  mpfr_t x;
+  _Decimal64 d;
+
+  mpfr_init2 (x, 53);
+
+  /* check important constants are correctly converted */
+  mpfr_set_ui (x, 17, GMP_RNDN);
+  d = mpfr_get_decimal64 (x, GMP_RNDN);
+  MPFR_ASSERTN(d == 17.0dd);
+
+  mpfr_set_ui (x, 42, GMP_RNDN);
+  d = mpfr_get_decimal64 (x, GMP_RNDN);
+  MPFR_ASSERTN(d == 42.0dd);
+
+  mpfr_set_decimal64 (x, 17.0dd, GMP_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_ui (x, 17) == 0);
+
+  mpfr_set_decimal64 (x, 42.0dd, GMP_RNDN);
+  MPFR_ASSERTN(mpfr_cmp_ui (x, 42) == 0);
+
+  mpfr_clear (x);
+}
+#endif /* MPFR_WANT_DECIMAL_FLOATS */
+
+int
+main (void)
+{
+  tests_start_mpfr ();
+  mpfr_test_init ();
+
+#ifdef MPFR_WANT_DECIMAL_FLOATS
+#ifdef DEBUG
+#ifdef DPD_FORMAT
+  printf ("Using DPD format\n");
+#else
+  printf ("Using BID format\n");
+#endif
+#endif
+  check_inf_nan ();
+  check_random ();
+  check_native ();
+#endif
+
+  tests_end_mpfr ();
+  return 0;
+}