/* Test mpz_add, mpz_sub, mpz_add_ui, mpz_sub_ui, and mpz_ui_sub.

Copyright 2002 Free Software Foundation, Inc.

This file is part of the GNU MP Library test suite.

The GNU MP Library test suite is free software; you can redistribute it
and/or modify it under the terms of the GNU 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 test suite 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 General
Public License for more details.

You should have received a copy of the GNU General Public License along with
the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */

#include <stdio.h>
#include <stdlib.h>

#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"
#include "tests.h"

void debug_mp (mpz_t, int);
void dump_abort (int, const char *, mpz_t, mpz_t);

int
main (int argc, char **argv)
{
  mpz_t op1, op2, r1, r2;
  mp_size_t op1n, op2n;
  unsigned long int op2long;
  int i;
  int reps = 100000;
  gmp_randstate_ptr rands;
  mpz_t bs;
  unsigned long bsi, size_range;

  tests_start ();
  rands = RANDS;

  mpz_init (bs);

  if (argc == 2)
     reps = atoi (argv[1]);

  mpz_init (op1);
  mpz_init (op2);
  mpz_init (r1);
  mpz_init (r2);

  for (i = 0; i < reps; i++)
    {
      mpz_urandomb (bs, rands, 32);
      size_range = mpz_get_ui (bs) % 10 + 2;

      mpz_urandomb (bs, rands, size_range);
      op1n = mpz_get_ui (bs);
      mpz_rrandomb (op1, rands, op1n);

      mpz_urandomb (bs, rands, size_range);
      op2n = mpz_get_ui (bs);
      mpz_rrandomb (op2, rands, op2n);

      mpz_urandomb (bs, rands, 2);
      bsi = mpz_get_ui (bs);
      if ((bsi & 1) != 0)
	mpz_neg (op1, op1);
      if ((bsi & 2) != 0)
	mpz_neg (op2, op2);

      /* printf ("%ld %ld\n", SIZ (multiplier), SIZ (multiplicand)); */

      mpz_add (r1, op1, op2);
      mpz_sub (r2, r1, op2);
      if (mpz_cmp (r2, op1) != 0)
	dump_abort (i, "mpz_add or mpz_sub incorrect", op1, op2);

      if (mpz_fits_ulong_p (op2))
	{
	  op2long = mpz_get_ui (op2);
	  mpz_add_ui (r1, op1, op2long);
	  mpz_sub_ui (r2, r1, op2long);
	  if (mpz_cmp (r2, op1) != 0)
	    dump_abort (i, "mpz_add_ui or mpz_sub_ui incorrect", op1, op2);

	  mpz_ui_sub (r1, op2long, op1);
	  mpz_sub_ui (r2, op1, op2long);
	  mpz_neg (r2, r2);
	  if (mpz_cmp (r1, r2) != 0)
	    dump_abort (i, "mpz_add_ui or mpz_ui_sub incorrect", op1, op2);
	}
    }

  mpz_clear (bs);
  mpz_clear (op1);
  mpz_clear (op2);
  mpz_clear (r1);
  mpz_clear (r2);

  tests_end ();
  exit (0);
}

void
dump_abort (int i, const char *s, mpz_t op1, mpz_t op2)
{
  fprintf (stderr, "ERROR: %s in test %d\n", s, i);
  fprintf (stderr, "op1 = "); debug_mp (op1, -16);
  fprintf (stderr, "op2 = "); debug_mp (op2, -16);
  abort();
}

void
debug_mp (mpz_t x, int base)
{
  mpz_out_str (stderr, base, x); fputc ('\n', stderr);
}