/* Test file for mpfr_set_d and mpfr_get_d.

Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
Contributed by the Arenaire and Caramel projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU 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 3 of the License, or (at your
option) any later version.

The GNU 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 GNU MPFR Library; see the file COPYING.LESSER.  If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

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

#include "mpfr-test.h"

int
main (int argc, char *argv[])
{
  mpfr_t x, y, z;
  unsigned long k, n;
  volatile double d;
  double dd;

  tests_start_mpfr ();
  mpfr_test_init ();

#ifndef MPFR_DOUBLE_SPEC
  printf ("Warning! The MPFR_DOUBLE_SPEC macro is not defined. This means\n"
          "that you do not have a conforming C implementation and problems\n"
          "may occur with conversions between MPFR numbers and standard\n"
          "floating-point types. Please contact the MPFR team.\n");
#elif MPFR_DOUBLE_SPEC == 0
  /*
  printf ("The type 'double' of your C implementation does not seem to\n"
          "correspond to the IEEE-754 double precision. Though code has\n"
          "been written to support such implementations, tests have been\n"
          "done only on IEEE-754 double-precision implementations and\n"
          "conversions between MPFR numbers and standard floating-point\n"
          "types may be inaccurate. You may wish to contact the MPFR team\n"
          "for further testing.\n");
  */
  printf ("The type 'double' of your C implementation does not seem to\n"
          "correspond to the IEEE-754 double precision. Such particular\n"
          "implementations are not supported yet, and conversions between\n"
          "MPFR numbers and standard floating-point types may be very\n"
          "inaccurate.\n");
  printf ("FLT_RADIX    = %ld\n", (long) FLT_RADIX);
  printf ("DBL_MANT_DIG = %ld\n", (long) DBL_MANT_DIG);
  printf ("DBL_MIN_EXP  = %ld\n", (long) DBL_MIN_EXP);
  printf ("DBL_MAX_EXP  = %ld\n", (long) DBL_MAX_EXP);
#endif

  mpfr_init (x);

#if !defined(MPFR_ERRDIVZERO)
  mpfr_set_nan (x);
  d = mpfr_get_d (x, MPFR_RNDN);
  if (! DOUBLE_ISNAN (d))
    {
      printf ("ERROR for NAN (1)\n");
#ifdef MPFR_NANISNAN
      printf ("The reason is that NAN == NAN. Please look at the configure "
              "output\nand Section \"In case of problem\" of the INSTALL "
              "file.\n");
#endif
      exit (1);
    }
  mpfr_set_ui (x, 0, MPFR_RNDN);
  mpfr_set_d (x, d, MPFR_RNDN);
  if (! mpfr_nan_p (x))
    {
      printf ("ERROR for NAN (2)\n");
#ifdef MPFR_NANISNAN
      printf ("The reason is that NAN == NAN. Please look at the configure "
              "output\nand Section \"In case of problem\" of the INSTALL "
              "file.\n");
#endif
      exit (1);
    }
#endif  /* MPFR_ERRDIVZERO */

  d = 0.0;
  mpfr_set_d (x, d, MPFR_RNDN);
  MPFR_ASSERTN(mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS(x));
  d = -d;
  mpfr_set_d (x, d, MPFR_RNDN);
  if (mpfr_cmp_ui (x, 0) != 0 || MPFR_IS_POS(x))
    {
      printf ("Error in mpfr_set_d on -0\n");
      exit (1);
    }

#if !defined(MPFR_ERRDIVZERO)
  mpfr_set_inf (x, 1);
  d = mpfr_get_d (x, MPFR_RNDN);
  mpfr_set_ui (x, 0, MPFR_RNDN);
  mpfr_set_d (x, d, MPFR_RNDN);
  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) > 0);

  mpfr_set_inf (x, -1);
  d = mpfr_get_d (x, MPFR_RNDN);
  mpfr_set_ui (x, 0, MPFR_RNDN);
  mpfr_set_d (x, d, MPFR_RNDN);
  MPFR_ASSERTN(mpfr_inf_p (x) && mpfr_sgn (x) < 0);
#endif  /* MPFR_ERRDIVZERO */

  mpfr_set_prec (x, 2);

  /* checks that denormalized are not flushed to zero */
  d = DBL_MIN; /* 2^(-1022) */
  for (n=0; n<52; n++, d /= 2.0)
    if (d != 0.0) /* should be 2^(-1022-n) */
      {
        mpfr_set_d (x, d, MPFR_RNDN);
        if (mpfr_cmp_ui_2exp (x, 1, -1022-n))
          {
            printf ("Wrong result for d=2^(%ld), ", -1022-n);
            printf ("got ");
            mpfr_out_str (stdout, 10, 10, x, MPFR_RNDN);
            printf ("\n");
            mpfr_print_binary (x);
            puts ("");
            exit (1);
          }
      }

   /* checks that rounds to nearest sets the last
     bit to zero in case of equal distance */
   mpfr_set_d (x, 5.0, MPFR_RNDN);
   if (mpfr_cmp_ui (x, 4))
     {
       printf ("Error in tset_d: expected 4.0, got ");
       mpfr_print_binary (x); putchar('\n');
       exit (1);
     }
   mpfr_set_d (x, -5.0, MPFR_RNDN);
   if (mpfr_cmp_si (x, -4))
     {
       printf ("Error in tset_d: expected -4.0, got ");
       mpfr_print_binary (x); putchar('\n');
       exit (1);
     }

   mpfr_set_d (x, 9.84891017624509146344e-01, MPFR_RNDU);
   if (mpfr_cmp_ui (x, 1))
     {
       printf ("Error in tset_d: expected 1.0, got ");
       mpfr_print_binary (x); putchar('\n');
       exit (1);
     }

  mpfr_init2 (z, 32);
  mpfr_set_d (z, 1.0, (mpfr_rnd_t) 0);
  if (mpfr_cmp_ui (z, 1))
    {
      mpfr_print_binary (z); puts ("");
      printf ("Error: 1.0 != 1.0\n");
      exit (1);
    }
  mpfr_set_prec (x, 53);
  mpfr_init2 (y, 53);
  mpfr_set_d (x, d=-1.08007920352320089721e+150, (mpfr_rnd_t) 0);
  if (mpfr_get_d1 (x) != d)
    {
      mpfr_print_binary (x); puts ("");
      printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n",
              d, mpfr_get_d1 (x));
      exit (1);
    }

  mpfr_set_d (x, 8.06294740693074521573e-310, (mpfr_rnd_t) 0);
  d = -6.72658901114033715233e-165;
  mpfr_set_d (x, d, (mpfr_rnd_t) 0);
  if (d != mpfr_get_d1 (x))
    {
      mpfr_print_binary (x);
      puts ("");
      printf ("Error: get_d o set_d <> identity for d = %1.20e %1.20e\n",
              d, mpfr_get_d1 (x));
      exit (1);
    }

  n = (argc==1) ? 500000 : atoi(argv[1]);
  for (k = 1; k <= n; k++)
    {
      do
        {
          d = DBL_RAND ();
        }
#ifdef HAVE_DENORMS
      while (0);
#else
      while (ABS(d) < DBL_MIN);
#endif
      mpfr_set_d (x, d, (mpfr_rnd_t) 0);
      dd = mpfr_get_d1 (x);
      if (d != dd && !(Isnan(d) && Isnan(dd)))
        {
          printf ("Mismatch on : %1.18g != %1.18g\n", d, mpfr_get_d1 (x));
          mpfr_print_binary (x);
          puts ("");
          exit (1);
        }
    }

  mpfr_clear (x);
  mpfr_clear (y);
  mpfr_clear (z);

  tests_end_mpfr ();
  return 0;
}
