gcc/mpfr/tests/tget_sj.c

/* Test file for mpfr_get_sj and mpfr_get_uj.

Copyright 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao 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 2.1 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.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */

#ifdef HAVE_CONFIG_H
# include "config.h"       /* for a build within gmp */
#endif

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

/* The ISO C99 standard specifies that in C++ implementations the
   INTMAX_MAX, ... macros should only be defined if explicitly requested.  */
#if defined __cplusplus
# define __STDC_LIMIT_MACROS
# define __STDC_CONSTANT_MACROS
#endif

#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
# include <inttypes.h>
#endif

#include "mpfr-test.h"

#ifndef _MPFR_H_HAVE_INTMAX_T

int
main (void)
{
  return 0;
}

#else

static void
check_sj (intmax_t s, mpfr_ptr x)
{
  mpfr_t y;
  int i;

  mpfr_init2 (y, MPFR_PREC (x));

  for (i = -1; i <= 1; i++)
    {
      int rnd;

      mpfr_set_si_2exp (y, i, -2, GMP_RNDN);
      mpfr_add (y, y, x, GMP_RNDN);
      for (rnd = 0; rnd < GMP_RND_MAX; rnd++)
        {
          intmax_t r;

          if (rnd == GMP_RNDZ && i < 0 && s >= 0)
            continue;
          if (rnd == GMP_RNDZ && i > 0 && s <= 0)
            continue;
          if (rnd == GMP_RNDD && i < 0)
            continue;
          if (rnd == GMP_RNDU && i > 0)
            continue;
          /* rint (y) == x == s */
          r = mpfr_get_sj (y, (mp_rnd_t) rnd);
          if (r != s)
            {
              printf ("Error in check_sj for y = ");
              mpfr_out_str (stdout, 2, 0, y, GMP_RNDN);
              printf (" in %s\n", mpfr_print_rnd_mode ((mp_rnd_t) rnd));
              printf ("Got %jd instead of %jd.\n", r, s);
              exit (1);
            }
        }
    }

  mpfr_clear (y);
}

static void
check_uj (uintmax_t u, mpfr_ptr x)
{
  mpfr_t y;
  int i;

  mpfr_init2 (y, MPFR_PREC (x));

  for (i = -1; i <= 1; i++)
    {
      int rnd;

      mpfr_set_si_2exp (y, i, -2, GMP_RNDN);
      mpfr_add (y, y, x, GMP_RNDN);
      for (rnd = 0; rnd < GMP_RND_MAX; rnd++)
        {
          uintmax_t r;

          if (rnd == GMP_RNDZ && i < 0)
            continue;
          if (rnd == GMP_RNDD && i < 0)
            continue;
          if (rnd == GMP_RNDU && i > 0)
            continue;
          /* rint (y) == x == u */
          r = mpfr_get_uj (y, (mp_rnd_t) rnd);
          if (r != u)
            {
              printf ("Error in check_uj for y = ");
              mpfr_out_str (stdout, 2, 0, y, GMP_RNDN);
              printf (" in %s\n", mpfr_print_rnd_mode ((mp_rnd_t) rnd));
              printf ("Got %ju instead of %ju.\n", r, u);
              exit (1);
            }
        }
    }

  mpfr_clear (y);
}

static void
check_erange (void)
{
  mpfr_t x;
  uintmax_t dl;
  intmax_t d;

  /* Test for ERANGE flag + correct behaviour if overflow */

  mpfr_init2 (x, 256);
  mpfr_set_uj (x, UINTMAX_MAX, GMP_RNDN);
  mpfr_clear_erangeflag ();
  dl = mpfr_get_uj (x, GMP_RNDN);
  if (dl != UINTMAX_MAX || mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_uj + ERANGE + UINTMAX_MAX (1)\n");
      exit (1);
    }
  mpfr_add_ui (x, x, 1, GMP_RNDN);
  dl = mpfr_get_uj (x, GMP_RNDN);
  if (dl != UINTMAX_MAX || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_uj + ERANGE + UINTMAX_MAX (2)\n");
      exit (1);
    }
  mpfr_set_sj (x, -1, GMP_RNDN);
  mpfr_clear_erangeflag ();
  dl = mpfr_get_uj (x, GMP_RNDN);
  if (dl != 0 || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_uj + ERANGE + -1 \n");
      exit (1);
    }
  mpfr_set_sj (x, INTMAX_MAX, GMP_RNDN);
  mpfr_clear_erangeflag ();
  d = mpfr_get_sj (x, GMP_RNDN);
  if (d != INTMAX_MAX || mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_sj + ERANGE + INTMAX_MAX (1)\n");
      exit (1);
    }
  mpfr_add_ui (x, x, 1, GMP_RNDN);
  d = mpfr_get_sj (x, GMP_RNDN);
  if (d != INTMAX_MAX || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_sj + ERANGE + INTMAX_MAX (2)\n");
      exit (1);
    }
  mpfr_set_sj (x, INTMAX_MIN, GMP_RNDN);
  mpfr_clear_erangeflag ();
  d = mpfr_get_sj (x, GMP_RNDN);
  if (d != INTMAX_MIN || mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_sj + ERANGE + INTMAX_MIN (1)\n");
      exit (1);
    }
  mpfr_sub_ui (x, x, 1, GMP_RNDN);
  d = mpfr_get_sj (x, GMP_RNDN);
  if (d != INTMAX_MIN || !mpfr_erangeflag_p ())
    {
      printf ("ERROR for get_sj + ERANGE + INTMAX_MIN (2)\n");
      exit (1);
    }

  mpfr_clear (x);
}

int
main (void)
{
  mp_prec_t prec;
  mpfr_t x, y;
  intmax_t s;
  uintmax_t u;

  tests_start_mpfr ();

  for (u = UINTMAX_MAX, prec = 0; u != 0; u /= 2, prec++)
    { }

  mpfr_init2 (x, prec + 4);
  mpfr_init2 (y, prec + 4);

  mpfr_set_ui (x, 0, GMP_RNDN);
  check_sj (0, x);
  check_uj (0, x);

  mpfr_set_si_2exp (x, 1, prec, GMP_RNDN);
  mpfr_sub_ui (x, x, 1, GMP_RNDN); /* UINTMAX_MAX */

  mpfr_div_ui (y, x, 2, GMP_RNDZ);
  mpfr_trunc (y, y); /* INTMAX_MAX */
  for (s = INTMAX_MAX; s != 0; s /= 17)
    {
      check_sj (s, y);
      mpfr_div_ui (y, y, 17, GMP_RNDZ);
      mpfr_trunc (y, y);
    }

  mpfr_div_ui (y, x, 2, GMP_RNDZ);
  mpfr_trunc (y, y); /* INTMAX_MAX */
  mpfr_neg (y, y, GMP_RNDN);
  if (INTMAX_MIN + INTMAX_MAX != 0)
    mpfr_sub_ui (y, y, 1, GMP_RNDN); /* INTMAX_MIN */
  for (s = INTMAX_MIN; s != 0; s /= 17)
    {
      check_sj (s, y);
      mpfr_div_ui (y, y, 17, GMP_RNDZ);
      mpfr_trunc (y, y);
    }

  for (u = UINTMAX_MAX; u != 0; u /= 17)
    {
      check_uj (u, x);
      mpfr_div_ui (x, x, 17, GMP_RNDZ);
      mpfr_trunc (x, x);
    }

  mpfr_clear (x);
  mpfr_clear (y);

  check_erange ();

  tests_end_mpfr ();
  return 0;
}

#endif