xref: /src/external/lgpl3/mpfr/dist/tests/tset.c

/* Test file for mpfr_set.

Copyright 2001-2016 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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 "mpfr-test.h"

int error;

#define PRINT_ERROR_IF(condition, text)         \
  do {                                          \
    if (condition)                              \
      {                                         \
        printf ("%s", text);                    \
        error = 1;                              \
      }                                         \
  } while (0)


/* Maybe better create its own test file ? */
static void
check_neg_special (void)
{
  mpfr_t x;
  mpfr_init (x);
  MPFR_SET_NAN (x);
  mpfr_clear_nanflag ();
  mpfr_neg (x, x, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_nanflag_p (),
                  "ERROR: neg (NaN) doesn't set Nan flag.\n");
  mpfr_clear (x);
}

static void
check_special (void)
{
  mpfr_t x, y;
  int inexact;

  mpfr_init (x);
  mpfr_init (y);

  mpfr_set_inf (x, 1);
  PRINT_ERROR_IF (!mpfr_inf_p (x) || mpfr_sgn (x) < 0,
                  "ERROR: mpfr_set_inf failed to set variable to +infinity.\n");
  inexact = mpfr_set (y, x, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_inf_p (y) || mpfr_sgn (y) < 0 || inexact != 0,
                  "ERROR: mpfr_set failed to set variable to +infinity.\n");

  inexact = mpfr_set_ui (y, 0, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_zero_p (y) || mpfr_sgn (y) < 0 || inexact != 0,
                  "ERROR: mpfr_set_ui failed to set variable to +0.\n");

  mpfr_set_inf (x, -1);
  PRINT_ERROR_IF (!mpfr_inf_p (x) || mpfr_sgn (x) > 0,
                  "ERROR: mpfr_set_inf failed to set variable to -infinity.\n");
  inexact = mpfr_set (y, x, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_inf_p (y) || mpfr_sgn (y) > 0 || inexact != 0,
                  "ERROR: mpfr_set failed to set variable to -infinity.\n");

  mpfr_set_zero (x, 1);
  PRINT_ERROR_IF (!mpfr_zero_p (x) || mpfr_sgn (x) < 0,
                  "ERROR: mpfr_set_zero failed to set variable to +0.\n");
  inexact = mpfr_set (y, x, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_zero_p (y) || mpfr_sgn (y) < 0 || inexact != 0,
                  "ERROR: mpfr_set failed to set variable to +0.\n");

  mpfr_set_zero (x, -1);
  PRINT_ERROR_IF (!mpfr_zero_p (x) || mpfr_sgn (x) > 0,
                  "ERROR: mpfr_set_zero failed to set variable to -0.\n");
  inexact = mpfr_set (y, x, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_zero_p (y) || mpfr_sgn (y) > 0 || inexact != 0,
                  "ERROR: mpfr_set failed to set variable to -0.\n");

  mpfr_set_nan (x);
  PRINT_ERROR_IF (!mpfr_nan_p (x),
                  "ERROR: mpfr_set_nan failed to set variable to NaN.\n");
  inexact = mpfr_set (y, x, MPFR_RNDN);
  PRINT_ERROR_IF (!mpfr_nan_p (y) || inexact != 0,
                  "ERROR: mpfr_set failed to set variable to NaN.\n");

  mpfr_clear (x);
  mpfr_clear (y);
}

static void
check_ternary_value (void)
{
  int p, q, rnd;
  int inexact, cmp;
  mpfr_t x, y;

  mpfr_init (x);
  mpfr_init (y);
  for (p=2; p<500; p++)
    {
      mpfr_set_prec (x, p);
      mpfr_urandomb (x, RANDS);
      if (randlimb () % 2)
        mpfr_neg (x, x, MPFR_RNDN);
      for (q=2; q<2*p; q++)
        {
          mpfr_set_prec (y, q);
          for (rnd = 0; rnd < MPFR_RND_MAX; rnd++)
            {
              inexact = mpfr_set (y, x, (mpfr_rnd_t) rnd);
              cmp = mpfr_cmp (y, x);
              if (((inexact == 0) && (cmp != 0)) ||
                  ((inexact > 0) && (cmp <= 0)) ||
                  ((inexact < 0) && (cmp >= 0)))
                {
                  printf ("Wrong ternary value in mpfr_set: expected %d,"
                          " got %d\n", cmp, inexact);
                  exit (1);
                }
            }
        }
    }
  mpfr_clear (x);
  mpfr_clear (y);
}

#define TEST_FUNCTION mpfr_set
#include "tgeneric.c"

int
main (void)
{
  mpfr_t x, y, z, u;
  int inexact;
  mpfr_exp_t emax;

  tests_start_mpfr ();

  /* Default : no error */
  error = 0;

  /* check prototypes of mpfr_init_set_* */
  inexact = mpfr_init_set_si (x, -1, MPFR_RNDN);
  MPFR_ASSERTN (inexact == 0);
  inexact = mpfr_init_set (y, x, MPFR_RNDN);
  MPFR_ASSERTN (inexact == 0);
  inexact = mpfr_init_set_ui (z, 1, MPFR_RNDN);
  MPFR_ASSERTN (inexact == 0);
  inexact = mpfr_init_set_d (u, 1.0, MPFR_RNDN);
  MPFR_ASSERTN (inexact == 0);

  emax = mpfr_get_emax ();
  set_emax (0);
  mpfr_set_prec (x, 3);
  mpfr_set_str_binary (x, "0.111");
  mpfr_set_prec (y, 2);
  mpfr_set (y, x, MPFR_RNDU);
  if (!(MPFR_IS_INF (y) && MPFR_SIGN (y) > 0))
    {
      printf ("Error for y=x=0.111 with px=3, py=2 and emax=0\nx=");
      mpfr_dump (x);
      printf ("y=");
      mpfr_dump (y);
      exit (1);
    }

  set_emax (emax);

  mpfr_set_prec (y, 11);
  mpfr_set_str_binary (y, "0.11111111100E-8");
  mpfr_set_prec (x, 2);
  mpfr_set (x, y, MPFR_RNDN);
  mpfr_set_str_binary (y, "1.0E-8");
  if (mpfr_cmp (x, y))
    {
      printf ("Error for y=0.11111111100E-8, prec=2, rnd=MPFR_RNDN\n");
      exit (1);
    }

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

  check_ternary_value ();
  check_special ();
  check_neg_special ();

  test_generic (2, 1000, 10);

  tests_end_mpfr ();
  return error;
}