/*

Copyright 2012, 2013 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 <limits.h>

#include <math.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include "testutils.h"

#define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)

#define COUNT 10000

static const struct

{

  double d;

  const char *s;

} values[] = {

  { 0.0, "0" },

  { 0.3, "0" },

  { -0.3, "0" },

  { M_PI, "3" },

  { M_PI*1e15, "b29430a256d21" },

  { -M_PI*1e15, "-b29430a256d21" },

  /* 17 * 2^{200} =

     27317946752402834684213355569799764242877450894307478200123392 */

  {0.2731794675240283468421335556979976424288e62,

    "1100000000000000000000000000000000000000000000000000" },

  { 0.0, NULL }

};

void

testmain (int argc, char **argv)

{

  unsigned i;

  mpz_t x;

  for (i = 0; values[i].s; i++)

    {

      char *s;

      mpz_init_set_d (x, values[i].d);

      s = mpz_get_str (NULL, 16, x);

      if (strcmp (s, values[i].s) != 0)

	{

	  fprintf (stderr, "mpz_set_d failed:\n"

		   "d = %.20g\n"

		   "s = %s\n"

		   "r = %s\n",

		   values[i].d, s, values[i].s);

	  abort ();

	}

      testfree (s);

      mpz_clear (x);

    }

  mpz_init (x);

  for (i = 0; i < COUNT; i++)

    {

      /* Use volatile, to avoid extended precision in floating point

	 registers, e.g., on m68k and 80387. */

      volatile double d, f;

      unsigned long m;

      int e;

      mini_rrandomb (x, GMP_LIMB_BITS);

      m = mpz_get_ui (x);

      mini_urandomb (x, 8);

      e = mpz_get_ui (x) - 100;

      d = ldexp ((double) m, e);

      mpz_set_d (x, d);

      f = mpz_get_d (x);

      if (f != floor (d))

	{

	  fprintf (stderr, "mpz_set_d/mpz_get_d failed:\n");

	  goto dumperror;

	}

      if ((f == d) ? (mpz_cmp_d (x, d) != 0) : (mpz_cmp_d (x, d) >= 0))

	{

	  fprintf (stderr, "mpz_cmp_d (x, d) failed:\n");

	  goto dumperror;

	}

      f = d + 1.0;

      if (f > d && ! (mpz_cmp_d (x, f) < 0))

	{

	  fprintf (stderr, "mpz_cmp_d (x, f) failed:\n");

	  goto dumperror;

	}

      d = - d;

      mpz_set_d (x, d);

      f = mpz_get_d (x);

      if (f != ceil (d))

	{

	  fprintf (stderr, "mpz_set_d/mpz_get_d failed:\n");

	dumperror:

	  dump ("x", x);

	  fprintf (stderr, "m = %lx, e = %i\n", m, e);

	  fprintf (stderr, "d = %.15g\n", d);

	  fprintf (stderr, "f = %.15g\n", f);

	  fprintf (stderr, "f - d = %.5g\n", f - d);

	  abort ();

	}

      if ((f == d) ? (mpz_cmp_d (x, d) != 0) : (mpz_cmp_d (x, d) <= 0))

	{

	  fprintf (stderr, "mpz_cmp_d (x, d) failed:\n");

	  goto dumperror;

	}

      f = d - 1.0;

      if (f < d && ! (mpz_cmp_d (x, f) > 0))

	{

	  fprintf (stderr, "mpz_cmp_d (x, f) failed:\n");

	  goto dumperror;

	}

    }

  mpz_clear (x);

}