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diff --git a/gmp/tests/t-modlinv.c b/gmp/tests/t-modlinv.c
new file mode 100644
index 00000000..2baf6c7e
--- /dev/null
+++ b/gmp/tests/t-modlinv.c
@@ -0,0 +1,84 @@
+/* Test binvert_limb.
+
+Copyright 2000, 2001, 2002, 2003 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>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+#include "tests.h"
+
+
+void
+one (mp_limb_t n)
+{
+  mp_limb_t  inv, prod;
+
+  binvert_limb (inv, n);
+  prod = (inv * n) & GMP_NUMB_MASK;
+  if (prod != 1)
+    {
+      printf ("binvert_limb wrong\n");
+      mp_limb_trace ("  n       ", n);
+      mp_limb_trace ("  got     ", inv);
+      mp_limb_trace ("  product ", prod);
+      abort ();
+    }
+}
+
+void
+some (void)
+{
+  int  i;
+  for (i = 0; i < 10000; i++)
+    one (refmpn_random_limb () | 1);
+}
+
+void
+all (void)
+{
+  mp_limb_t  n;
+
+  n = 1;
+  do {
+    one (n);
+    n += 2;
+  } while (n != 1);
+}
+
+
+int
+main (int argc, char *argv[])
+{
+  tests_start ();
+
+  if (argc >= 2 && strcmp (argv[1], "-a") == 0)
+    {
+      /* it's feasible to run all values on a 32-bit limb, but not a 64-bit */
+      all ();
+    }
+  else
+    {
+      some ();
+    }
+
+  tests_end ();
+  exit (0);
+}