third_party/gmp/tests/mpq/t-cmp.c

/* Test mpq_cmp.

Copyright 1996, 2001 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-impl.h"
#include "tests.h"

#define SGN(x) ((x) < 0 ? -1 : (x) > 0 ? 1 : 0)

int
ref_mpq_cmp (mpq_t a, mpq_t b)
{
  mpz_t ai, bi;
  int cc;

  mpz_init (ai);
  mpz_init (bi);

  mpz_mul (ai, NUM (a), DEN (b));
  mpz_mul (bi, NUM (b), DEN (a));
  cc = mpz_cmp (ai, bi);
  mpz_clear (ai);
  mpz_clear (bi);
  return cc;
}

#ifndef SIZE
#define SIZE 8	/* increasing this lowers the probability of finding an error */
#endif

int
main (int argc, char **argv)
{
  mpq_t a, b;
  mp_size_t size;
  int reps = 10000;
  int i;
  int cc, ccref;

  tests_start ();

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

  mpq_init (a);
  mpq_init (b);

  for (i = 0; i < reps; i++)
    {
      size = urandom () % SIZE - SIZE/2;
      mpz_random2 (NUM (a), size);
      do
	{
	  size = urandom () % SIZE - SIZE/2;
	  mpz_random2 (DEN (a), size);
	}
      while (mpz_cmp_ui (DEN (a), 0) == 0);

      size = urandom () % SIZE - SIZE/2;
      mpz_random2 (NUM (b), size);
      do
	{
	  size = urandom () % SIZE - SIZE/2;
	  mpz_random2 (DEN (b), size);
	}
      while (mpz_cmp_ui (DEN (b), 0) == 0);

      mpq_canonicalize (a);
      mpq_canonicalize (b);

      ccref = ref_mpq_cmp (a, b);
      cc = mpq_cmp (a, b);

      if (SGN (ccref) != SGN (cc))
	abort ();
    }

  mpq_clear (a);
  mpq_clear (b);

  tests_end ();
  exit (0);
}