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diff --git a/gmp/tests/mpf/t-conv.c b/gmp/tests/mpf/t-conv.c
new file mode 100644
index 00000000..0a51fcc0
--- /dev/null
+++ b/gmp/tests/mpf/t-conv.c
@@ -0,0 +1,143 @@
+/* Test mpf_get_str and mpf_set_str.
+
+Copyright 1996, 2000, 2001, 2008 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h> /* for strlen */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+#ifndef SIZE
+#define SIZE 10
+#endif
+
+#ifndef EXPO
+#define EXPO 200
+#endif
+
+int
+main (int argc, char **argv)
+{
+  mpf_t x, y;
+  int reps = 20000;
+  int i;
+  mp_size_t bprec = 100;
+  mpf_t d, rerr, max_rerr, limit_rerr;
+  char *str;
+  mp_exp_t bexp;
+  long size, exp;
+  int base;
+  char buf[SIZE * BITS_PER_MP_LIMB + 5];
+
+  tests_start ();
+
+  if (argc > 1)
+    {
+      reps = strtol (argv[1], 0, 0);
+      if (argc > 2)
+	bprec = strtol (argv[2], 0, 0);
+    }
+
+  mpf_set_default_prec (bprec);
+
+  mpf_init_set_ui (limit_rerr, 1);
+  mpf_div_2exp (limit_rerr, limit_rerr, bprec);
+#if VERBOSE
+  mpf_dump (limit_rerr);
+#endif
+  mpf_init (rerr);
+  mpf_init_set_ui (max_rerr, 0);
+
+  mpf_init (x);
+  mpf_init (y);
+  mpf_init (d);
+
+  /* First test some specific values.  */
+
+  mpf_set_str (y, "1.23456e1000", 0);
+
+  mpf_set_str (x, "1.23456e1000", 10);
+  if (mpf_cmp (x, y) != 0)
+    abort ();
+  mpf_set_str (x, "1.23456e+1000", 0);
+  if (mpf_cmp (x, y) != 0)
+    abort ();
+  mpf_set_str (x, "1.23456e+1000", 10);
+  if (mpf_cmp (x, y) != 0)
+    abort ();
+
+  /* Now test random values.  */
+
+  for (i = 0; i < reps; i++)
+    {
+      if (i == 0)
+        {
+          /* exercise the special case in get_str for for x==0 */
+          mpf_set_ui (x, 0L);
+          base = 10;
+        }
+      else
+        {
+          size = urandom () % (2 * SIZE) - SIZE;
+          exp = urandom () % EXPO;
+          mpf_random2 (x, size, exp);
+          base = urandom () % 61 + 2;
+        }
+
+      str = mpf_get_str (0, &bexp, base, 0, x);
+
+      if (str[0] == '-')
+	sprintf (buf, "-0.%s@%ld", str + 1, bexp);
+      else
+	sprintf (buf, "0.%s@%ld", str, bexp);
+
+      mpf_set_str_or_abort (y, buf, -base);
+      (*__gmp_free_func) (str, strlen (str) + 1);
+
+      mpf_reldiff (rerr, x, y);
+      if (mpf_cmp (rerr, max_rerr) > 0)
+	{
+	  mpf_set (max_rerr, rerr);
+#if VERBOSE
+	  mpf_dump (max_rerr);
+#endif
+	  if (mpf_cmp (rerr, limit_rerr) > 0)
+	    {
+	      printf ("ERROR after %d tests\n", i);
+	      printf ("base = %d\n", base);
+	      printf ("   x = "); mpf_dump (x);
+	      printf ("   y = "); mpf_dump (y);
+	      abort ();
+	    }
+	}
+    }
+
+  mpf_clear (limit_rerr);
+  mpf_clear (rerr);
+  mpf_clear (max_rerr);
+
+  mpf_clear (x);
+  mpf_clear (y);
+  mpf_clear (d);
+
+  tests_end ();
+  exit (0);
+}