/* Test file for mpfr_can_round.

Copyright 1999, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.

This file is part of the MPFR Library.

The MPFR 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 2.1 of the License, or (at your
option) any later version.

The MPFR 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 MPFR 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 <stdlib.h>

#include "mpfr-test.h"

#define MAX_LIMB_SIZE 100

static void
check_round_p (void)
{
  mp_limb_t buf[MAX_LIMB_SIZE];
  mp_size_t n;
  mp_prec_t p;
  mp_exp_t err;
  int r1, r2;

  for (n = 2 ; n <= MAX_LIMB_SIZE ; n++)
    {
      mpn_random (buf, n);
      p = (mp_prec_t) randlimb() % ((n-1) * BITS_PER_MP_LIMB) + MPFR_PREC_MIN;
      err = p + randlimb () % BITS_PER_MP_LIMB;
      r1 = mpfr_round_p (buf, n, err, p);
      r2 = mpfr_can_round_raw (buf, n, MPFR_SIGN_POS, err,
			       GMP_RNDN, GMP_RNDZ, p);
      if (r1 != r2)
	{
	  printf ("mpfr_round_p(%d) != mpfr_can_round(%d)!\n"
		  "bn=%ld err0=%ld prec=%ld\nbp=",
		  r1, r2, n, err, p);
	  while (n--)
	    printf ("%08lX ", buf[n]);
	  putchar ('\n');
	  exit (1);
	}
    }
}

int
main (void)
{
  mpfr_t x;
  mp_prec_t i, j;

  MPFR_TEST_USE_RANDS ();
  tests_start_mpfr ();

  /* checks that rounds to nearest sets the last
     bit to zero in case of equal distance */
  mpfr_init2 (x, 59);
  mpfr_set_str_binary (x, "-0.10010001010111000011110010111010111110000000111101100111111E663"); 
  if (mpfr_can_round (x, 54, GMP_RNDZ, GMP_RNDZ, 53) != 0)
    {
      printf ("Error (1) in mpfr_can_round\n");
      exit (1);
    }

  mpfr_set_str_binary (x, "-Inf"); 
  if (mpfr_can_round (x, 2000, GMP_RNDZ, GMP_RNDZ, 2000) != 0)
    {
      printf ("Error (2) in mpfr_can_round\n");
      exit (1);
    }

  mpfr_set_prec (x, 64);
  mpfr_set_str_binary (x, "0.1011001000011110000110000110001111101011000010001110011000000000");
  if (mpfr_can_round (x, 65, GMP_RNDN, GMP_RNDN, 54))
    {
      printf ("Error (3) in mpfr_can_round\n");
      exit (1);
    }

  mpfr_set_prec (x, 62);
  mpfr_set_str (x, "0.ff4ca619c76ba69", 16, GMP_RNDZ);
  for (i = 30; i < 99; i++)
    for (j = 30; j < 99; j++)
      {
        int r1, r2;
        for (r1 = 0; r1 < GMP_RND_MAX ; r1++)
          for (r2 = 0; r2 < GMP_RND_MAX ; r2++)
            mpfr_can_round (x, i, (mp_rnd_t) r1, (mp_rnd_t) r2, j); /* test for assertions */
      }

  mpfr_clear (x);

  check_round_p ();

  tests_end_mpfr ();
  return 0;
}