third_party/gmp/tests/mpf/t-muldiv.c

/* Test mpf_mul, mpf_div, mpf_ui_div, and mpf_div_ui.

Copyright 1996, 2000, 2001, 2003 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"

#ifndef SIZE
#define SIZE 16
#endif

int
main (int argc, char **argv)
{
  mp_size_t size;
  mp_exp_t exp;
  int reps = 10000;
  int i;
  mpf_t u, v, w, x;
  mp_size_t bprec = SIZE * GMP_LIMB_BITS;
  mpf_t rerr, limit_rerr;
  unsigned long ulimb, vlimb;
  int single_flag;

  tests_start ();

  if (argc > 1)
    {
      reps = strtol (argv[1], 0, 0);
      if (argc > 2)
	bprec = strtol (argv[2], 0, 0);
    }

  mpf_set_default_prec (bprec);

  mpf_init (rerr);
  mpf_init (limit_rerr);

  mpf_init (u);
  mpf_init (v);
  mpf_init (w);
  mpf_init (x);

  for (i = 0; i < reps; i++)
    {
      mp_size_t res_prec;

      res_prec = urandom () % bprec + 1;
      mpf_set_prec (w, res_prec);
      mpf_set_prec (x, res_prec);

      mpf_set_ui (limit_rerr, 1);
      mpf_div_2exp (limit_rerr, limit_rerr, res_prec - 1);

      single_flag = 0;

      if ((urandom () & 1) != 0)
	{
	  size = urandom () % (2 * SIZE) - SIZE;
	  exp = urandom () % SIZE;
	  mpf_random2 (u, size, exp);
	}
      else
	{
	  ulimb = urandom ();
	  mpf_set_ui (u, ulimb);
	  single_flag = 1;
	}

      if ((urandom () & 1) != 0)
	{
	  size = urandom () % (2 * SIZE) - SIZE;
	  exp = urandom () % SIZE;
	  mpf_random2 (v, size, exp);
	}
      else
	{
	  vlimb = urandom ();
	  mpf_set_ui (v, vlimb);
	  single_flag = 2;
	}

      if (mpf_sgn (v) == 0)
	continue;

      mpf_div (w, u, v);
      mpf_mul (x, w, v);
      mpf_reldiff (rerr, u, x);
      if (mpf_cmp (rerr, limit_rerr) > 0)
	{
	  printf ("ERROR in mpf_mul or mpf_div after %d tests\n", i);
	  printf ("   u = "); mpf_dump (u);
	  printf ("   v = "); mpf_dump (v);
	  printf ("   x = "); mpf_dump (x);
	  printf ("   w = "); mpf_dump (w);
	  abort ();
	}

      if (single_flag == 2)
	{
	  mpf_div_ui (x, u, vlimb);
	  mpf_reldiff (rerr, w, x);
	  if (mpf_cmp (rerr, limit_rerr) > 0)
	    {
	      printf ("ERROR in mpf_div or mpf_div_ui after %d tests\n", i);
	      printf ("   u = "); mpf_dump (u);
	      printf ("   v = "); mpf_dump (v);
	      printf ("   x = "); mpf_dump (x);
	      printf ("   w = "); mpf_dump (w);
	      abort ();
	    }
	}

      if (single_flag == 1)
	{
	  mpf_ui_div (x, ulimb, v);
	  mpf_reldiff (rerr, w, x);
	  if (mpf_cmp (rerr, limit_rerr) > 0)
	    {
	      printf ("ERROR in mpf_div or mpf_ui_div after %d tests\n", i);
	      printf ("   u = "); mpf_dump (u);
	      printf ("   v = "); mpf_dump (v);
	      printf ("   x = "); mpf_dump (x);
	      printf ("   w = "); mpf_dump (w);
	      abort ();
	    }
	}
    }

  mpf_clear (rerr);
  mpf_clear (limit_rerr);

  mpf_clear (u);
  mpf_clear (v);
  mpf_clear (w);
  mpf_clear (x);

  tests_end ();
  exit (0);
}