1 files changed, 120 insertions, 0 deletions
diff --git a/mpz/tests/t-powm_ui.c b/mpz/tests/t-powm_ui.c
new file mode 100644
index 000000000..b88fa9820
--- /dev/null
+++ b/mpz/tests/t-powm_ui.c
@@ -0,0 +1,120 @@
+/* Test mpz_powm_ui, mpz_mul. mpz_mod, mpz_mod_ui, mpz_div_ui.
+
+Copyright (C) 1991, 1993, 1994, 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "urandom.h"
+
+void debug_mp ();
+
+#ifndef SIZE
+#define SIZE 8
+#endif
+
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  mpz_t base, mod;
+  mpz_t r1, r2, base2;
+  mp_size_t base_size, mod_size;
+  mp_limb_t exp, exp2;
+  int i;
+  int reps = 10000;
+
+  if (argc == 2)
+     reps = atoi (argv[1]);
+
+  mpz_init (base);
+  mpz_init (mod);
+  mpz_init (r1);
+  mpz_init (r2);
+  mpz_init (base2);
+
+  for (i = 0; i < reps; i++)
+    {
+      base_size = urandom () % SIZE /* - SIZE/2 */;
+      mpz_random2 (base, base_size);
+
+      mpn_random2 (&exp, 1);
+
+      mod_size = urandom () % SIZE /* - SIZE/2 */;
+      mpz_random2 (mod, mod_size);
+      if (mpz_cmp_ui (mod, 0) == 0)
+	continue;
+
+      /* This is mathematically undefined.  */
+      if (mpz_cmp_ui (base, 0) == 0 && exp == 0)
+	continue;
+
+#if 0
+      putc ('\n', stderr);
+      debug_mp (base, -16);
+      debug_mp (mod, -16);
+#endif
+
+      mpz_powm_ui (r1, base, (unsigned long int) exp, mod);
+
+      mpz_set_ui (r2, 1);
+      mpz_set (base2, base);
+      exp2 = exp;
+
+      mpz_mod (r2, r2, mod);	/* needed when exp==0 and mod==1 */
+      while (exp2 != 0)
+	{
+	  if (exp2 % 2 != 0)
+	    {
+	      mpz_mul (r2, r2, base2);
+	      mpz_mod (r2, r2, mod);
+	    }
+	  mpz_mul (base2, base2, base2);
+	  mpz_mod (base2, base2, mod);
+	  exp2 = exp2 / 2;
+	}
+
+#if 0
+      debug_mp (r1, -16);
+      debug_mp (r2, -16);
+#endif
+
+      if (mpz_cmp (r1, r2) != 0)
+	abort ();
+    }
+
+  exit (0);
+}
+
+dump_abort (dividend, divisor)
+     MP_INT *dividend, *divisor;
+{
+  fprintf (stderr, "ERROR\n");
+  fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
+  fprintf (stderr, "divisor  = "); debug_mp (divisor, -16);
+  abort();
+}
+
+void
+debug_mp (x, base)
+     MP_INT *x;
+{
+  mpz_out_str (stderr, base, x); fputc ('\n', stderr);
+}