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diff --git a/gmp/tests/mpn/t-perfsqr.c b/gmp/tests/mpn/t-perfsqr.c
new file mode 100644
index 00000000..6afe708d
--- /dev/null
+++ b/gmp/tests/mpn/t-perfsqr.c
@@ -0,0 +1,117 @@
+/* Test mpn_perfect_square_p data.
+
+Copyright 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"
+
+#include "mpn/perfsqr.h"
+
+
+#define PERFSQR_MOD_MASK   ((CNST_LIMB(1) << PERFSQR_MOD_BITS) - 1)
+
+void
+check_mod_2 (mp_limb_t d, mp_limb_t inv, mp_limb_t got_hi, mp_limb_t got_lo)
+{
+  int        want[2*GMP_LIMB_BITS], got;
+  unsigned   r, idx;
+  mp_limb_t  q;
+
+  ASSERT_ALWAYS (d <= numberof (want));
+  ASSERT_ALWAYS (((inv * d) & PERFSQR_MOD_MASK) == 1);
+  ASSERT_ALWAYS (MP_LIMB_T_MAX / d >= PERFSQR_MOD_MASK);
+
+  /* the squares mod d */
+  for (r = 0; r < d; r++)
+    want[r] = 0;
+  for (r = 0; r < d; r++)
+    want[(r*r)%d] = 1;
+
+  /* for each remainder mod d, expect the table data to correctly identify
+     it as a residue or non-residue */
+  for (r = 0; r < d; r++)
+    {
+      /* as per PERFSQR_MOD_IDX */
+      q = ((r) * (inv)) & PERFSQR_MOD_MASK;
+      idx = (q * (d)) >> PERFSQR_MOD_BITS;
+
+      if (idx >= GMP_LIMB_BITS)
+        got = (got_hi >> (idx - GMP_LIMB_BITS)) & 1;
+      else
+        got = (got_lo >> idx) & 1;
+
+      if (got != want[r])
+        {
+          printf ("Wrong generated data\n");
+          printf ("  d=%u\n", (unsigned) d);
+          printf ("  r=%u\n", r);
+          printf ("  idx=%u\n", idx);
+          printf ("  got  %d\n", got);
+          printf ("  want %d\n", want[r]);
+          abort ();
+        }
+    }
+}
+
+/* Check the generated data in perfsqr.h. */
+void
+check_mod (void)
+{
+#define PERFSQR_MOD_34(r, up, usize)       { r = 0; } /* so r isn't unused */
+#define PERFSQR_MOD_PP(r, up, usize)       { r = 0; }
+#define PERFSQR_MOD_1(r, d, inv, mask)     check_mod_2 (d, inv, CNST_LIMB(0), mask)
+#define PERFSQR_MOD_2(r, d, inv, mhi, mlo) check_mod_2 (d, inv, mhi, mlo)
+
+  PERFSQR_MOD_TEST (dummy, dummy);
+}
+
+/* Check PERFSQR_PP, if in use. */
+void
+check_pp (void)
+{
+#ifdef PERFSQR_PP
+  ASSERT_ALWAYS_LIMB (PERFSQR_PP);
+  ASSERT_ALWAYS_LIMB (PERFSQR_PP_NORM);
+  ASSERT_ALWAYS_LIMB (PERFSQR_PP_INVERTED);
+
+  /* preinv stuff only for nails==0 */
+  if (GMP_NAIL_BITS == 0)
+    {
+      ASSERT_ALWAYS (PERFSQR_PP_NORM
+                     == PERFSQR_PP << refmpn_count_leading_zeros (PERFSQR_PP));
+      ASSERT_ALWAYS (PERFSQR_PP_INVERTED
+                     == refmpn_invert_limb (PERFSQR_PP_NORM));
+    }
+#endif
+}
+
+int
+main (void)
+{
+  tests_start ();
+
+  check_mod ();
+  check_pp ();
+
+  tests_end ();
+  exit (0);
+}