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diff --git a/gmp/tests/mpz/t-hamdist.c b/gmp/tests/mpz/t-hamdist.c
new file mode 100644
index 00000000..81093659
--- /dev/null
+++ b/gmp/tests/mpz/t-hamdist.c
@@ -0,0 +1,124 @@
+/* Test mpz_hamdist.
+
+Copyright 2001, 2002 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"
+
+
+void
+check_twobits (void)
+{
+  unsigned long  i, j, got, want;
+  mpz_t  x, y;
+
+  mpz_init (x);
+  mpz_init (y);
+  for (i = 0; i < 5 * GMP_NUMB_BITS; i++)
+    {
+      for (j = 0; j < 5 * GMP_NUMB_BITS; j++)
+        {
+          mpz_set_ui (x, 0L);
+          mpz_setbit (x, i);
+          mpz_set_ui (y, 0L);
+          mpz_setbit (y, j);
+
+          want = 2 * (i != j);
+          got = mpz_hamdist (x, y);
+          if (got != want)
+            {
+              printf    ("mpz_hamdist wrong on 2 bits pos/pos\n");
+            wrong:
+              printf    ("  i    %lu\n", i);
+              printf    ("  j    %lu\n", j);
+              printf    ("  got  %lu\n", got);
+              printf    ("  want %lu\n", want);
+              mpz_trace ("  x   ", x);
+              mpz_trace ("  y   ", y);
+              abort();
+            }
+
+          mpz_neg (x, x);
+          mpz_neg (y, y);
+          want = ABS ((long) (i-j));
+          got = mpz_hamdist (x, y);
+          if (got != want)
+            {
+              printf    ("mpz_hamdist wrong on 2 bits neg/neg\n");
+              goto wrong;
+            }
+        }
+
+    }
+  mpz_clear (x);
+  mpz_clear (y);
+}
+
+
+void
+check_rand (void)
+{
+  gmp_randstate_ptr  rands = RANDS;
+  unsigned long  got, want;
+  int    i;
+  mpz_t  x, y;
+
+  mpz_init (x);
+  mpz_init (y);
+
+  for (i = 0; i < 2000; i++)
+    {
+      mpz_erandomb (x, rands, 6 * GMP_NUMB_BITS);
+      mpz_negrandom (x, rands);
+      mpz_mul_2exp (x, x, urandom() % (4 * GMP_NUMB_BITS));
+
+      mpz_erandomb (y, rands, 6 * GMP_NUMB_BITS);
+      mpz_negrandom (y, rands);
+      mpz_mul_2exp (y, y, urandom() % (4 * GMP_NUMB_BITS));
+
+      want = refmpz_hamdist (x, y);
+      got = mpz_hamdist (x, y);
+      if (got != want)
+        {
+          printf    ("mpz_hamdist wrong on random\n");
+          printf    ("  got  %lu\n", got);
+          printf    ("  want %lu\n", want);
+          mpz_trace ("  x   ", x);
+          mpz_trace ("  y   ", y);
+          abort();
+        }
+    }
+  mpz_clear (x);
+  mpz_clear (y);
+}
+
+int
+main (void)
+{
+  tests_start ();
+  mp_trace_base = -16;
+
+  check_twobits ();
+  check_rand ();
+
+  tests_end ();
+  exit (0);
+}