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diff --git a/gmp/tests/mpf/t-add.c b/gmp/tests/mpf/t-add.c
new file mode 100644
index 00000000..db0dbe5b
--- /dev/null
+++ b/gmp/tests/mpf/t-add.c
@@ -0,0 +1,108 @@
+/* Test mpf_add.
+
+Copyright 1996, 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 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 "gmp.h"
+#include "gmp-impl.h"
+#include "tests.h"
+
+#ifndef SIZE
+#define SIZE 16
+#endif
+
+int
+main (int argc, char **argv)
+{
+  mp_size_t size;
+  mp_exp_t exp;
+  int reps = 20000;
+  int i;
+  mpf_t u, v, w, wref;
+  mp_size_t bprec = 100;
+  mpf_t rerr, max_rerr, limit_rerr;
+
+  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 (u);
+  mpf_init (v);
+  mpf_init (w);
+  mpf_init (wref);
+  for (i = 0; i < reps; i++)
+    {
+      size = urandom () % (2 * SIZE) - SIZE;
+      exp = urandom () % SIZE;
+      mpf_random2 (u, size, exp);
+
+      size = urandom () % (2 * SIZE) - SIZE;
+      exp = urandom () % SIZE;
+      mpf_random2 (v, size, exp);
+
+      mpf_add (w, u, v);
+      refmpf_add (wref, u, v);
+
+      mpf_reldiff (rerr, w, wref);
+      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 ("   u = "); mpf_dump (u);
+	      printf ("   v = "); mpf_dump (v);
+	      printf ("wref = "); mpf_dump (wref);
+	      printf ("   w = "); mpf_dump (w);
+	      abort ();
+	    }
+	}
+    }
+
+  mpf_clear (limit_rerr);
+  mpf_clear (rerr);
+  mpf_clear (max_rerr);
+
+  mpf_clear (u);
+  mpf_clear (v);
+  mpf_clear (w);
+  mpf_clear (wref);
+
+  tests_end ();
+  exit (0);
+}