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diff --git a/gmp/tests/mpz/t-cmp_si.c b/gmp/tests/mpz/t-cmp_si.c
new file mode 100644
index 00000000..25e8a3b3
--- /dev/null
+++ b/gmp/tests/mpz/t-cmp_si.c
@@ -0,0 +1,102 @@
+/* Test mpz_cmp_si.
+
+Copyright 2000, 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"
+
+#define SGN(x)       ((x) < 0 ? -1 : (x) == 0 ? 0 : 1)
+
+void
+check_data (void)
+{
+  static const struct {
+    const char  *a, *b;
+    int         want;
+  } data[] = {
+    { "0",  "1", -1 },
+    { "0",  "0",  0 },
+    { "0", "-1",  1 },
+
+    { "1",  "1", 0 },
+    { "1",  "0", 1 },
+    { "1", "-1", 1 },
+
+    { "-1",  "1", -1 },
+    { "-1",  "0", -1 },
+    { "-1", "-1", 0 },
+
+    {           "0", "-0x80000000",  1 },
+    {  "0x80000000", "-0x80000000",  1 },
+    {  "0x80000001", "-0x80000000",  1 },
+    { "-0x80000000", "-0x80000000",  0 },
+    { "-0x80000001", "-0x80000000", -1 },
+
+    {                   "0", "-0x8000000000000000",  1 },
+    {  "0x8000000000000000", "-0x8000000000000000",  1 },
+    {  "0x8000000000000001", "-0x8000000000000000",  1 },
+    { "-0x8000000000000000", "-0x8000000000000000",  0 },
+    { "-0x8000000000000001", "-0x8000000000000000", -1 },
+  };
+
+  mpz_t  a, bz;
+  long   b;
+  int    got;
+  int    i;
+
+  mpz_init (a);
+  mpz_init (bz);
+  for (i = 0; i < numberof (data); i++)
+    {
+      mpz_set_str_or_abort (a, data[i].a, 0);
+      mpz_set_str_or_abort (bz, data[i].b, 0);
+
+      if (mpz_fits_slong_p (bz))
+	{
+	  b = mpz_get_si (bz);
+	  got = mpz_cmp_si (a, b);
+	  if (SGN (got) != data[i].want)
+	    {
+	      printf ("mpz_cmp_si wrong on data[%d]\n", i);
+	      printf ("  a="); mpz_out_str (stdout, 10, a); printf ("\n");
+	      printf ("  b=%ld\n", b);
+	      printf ("  got=%d\n", got);
+	      printf ("  want=%d\n", data[i].want);
+	      abort();
+	    }
+	}
+    }
+
+  mpz_clear (a);
+  mpz_clear (bz);
+}
+
+
+int
+main (void)
+{
+  tests_start ();
+
+  check_data ();
+
+  tests_end ();
+  exit (0);
+}