gcc/mpfr/tests/tset_f.c

/* Test file for mpfr_set_f.

Copyright 1999, 2001, 2002, 2003, 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. */

#include <stdio.h>
#include <stdlib.h>
#include <limits.h> /* for ULONG_MAX */

#include "mpfr-test.h"

int
main (void)
{
  mpfr_t x, u;
  mpf_t y, z;
  mp_exp_t emax;
  unsigned long k, pr;
  int r, inexact;

  tests_start_mpfr ();

  mpf_init (y);
  mpf_init (z);

  mpf_set_d (y, 0.0);

  /* check prototype of mpfr_init_set_f */
  mpfr_init_set_f (x, y, GMP_RNDN);
  mpfr_set_prec (x, 100);
  mpfr_set_f (x, y, GMP_RNDN);

  mpf_urandomb (y, RANDS, 10 * GMP_NUMB_BITS);
  mpfr_set_f (x, y, RND_RAND ());

  /* bug found by Jean-Pierre Merlet */
  mpfr_set_prec (x, 256);
  mpf_set_prec (y, 256);
  mpfr_init2 (u, 256);
  mpfr_set_str (u,
                "7.f10872b020c49ba5e353f7ced916872b020c49ba5e353f7ced916872b020c498@2",
                16, GMP_RNDN);
  mpf_set_str (y, "2033033E-3", 10); /* avoid 2033.033 which is
                                        locale-sensitive */
  mpfr_set_f (x, y, GMP_RNDN);
  if (mpfr_cmp (x, u))
    {
      printf ("mpfr_set_f failed for y=2033033E-3\n");
      exit (1);
    }
  mpf_set_str (y, "-2033033E-3", 10); /* avoid -2033.033 which is
                                         locale-sensitive */
  mpfr_set_f (x, y, GMP_RNDN);
  mpfr_neg (u, u, GMP_RNDN);
  if (mpfr_cmp (x, u))
    {
      printf ("mpfr_set_f failed for y=-2033033E-3\n");
      exit (1);
    }

  mpf_set_prec (y, 300);
  mpf_set_str (y, "1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111", -2);
  mpf_mul_2exp (y, y, 600);
  mpfr_set_prec (x, 300);
  mpfr_set_f (x, y, GMP_RNDN);
  if (mpfr_check (x) == 0)
    {
      printf ("Error in mpfr_set_f: corrupted result\n");
      mpfr_dump (x);
      exit (1);
    }
  MPFR_ASSERTN(mpfr_cmp_ui_2exp (x, 1, 901) == 0);

  /* random values */
  for (k = 1; k <= 1000; k++)
    {
      pr = 2 + (randlimb () & 255);
      mpf_set_prec (z, pr);
      mpf_urandomb (z, RANDS, z->_mp_prec);
      mpfr_set_prec (u, ((pr / BITS_PER_MP_LIMB + 1) * BITS_PER_MP_LIMB));
      mpfr_set_f (u, z, GMP_RNDN);
      if (mpfr_cmp_f (u , z) != 0)
        {
          printf ("Error in mpfr_set_f:\n");
          printf ("mpf (precision=%lu)=", pr);
          mpf_out_str (stdout, 16, 0, z);
          printf ("\nmpfr(precision=%lu)=",
                  ((pr / BITS_PER_MP_LIMB + 1) * BITS_PER_MP_LIMB));
          mpfr_out_str (stdout, 16, 0, u, GMP_RNDN);
          putchar ('\n');
          exit (1);
        }
      mpfr_set_prec (x, pr);
      mpfr_set_f (x, z, GMP_RNDN);
      mpfr_sub (u, u, x, GMP_RNDN);
      mpfr_abs (u, u, GMP_RNDN);
      if (mpfr_cmp_ui_2exp (u, 1, -pr - 1) > 0)
        {
          printf ("Error in mpfr_set_f: precision=%lu\n", pr);
          printf ("mpf =");
          mpf_out_str (stdout, 16, 0, z);
          printf ("\nmpfr=");
          mpfr_out_str (stdout, 16, 0, x, GMP_RNDN);
          putchar ('\n');
          exit (1);
        }
    }

  /* Check for +0 */
  mpfr_set_prec (x, 53);
  mpf_set_prec (y, 53);
  mpf_set_ui (y, 0);
  for (r = 0 ; r < GMP_RND_MAX ; r++)
    {
      int i;
      for (i = -1; i <= 1; i++)
        {
          if (i)
            mpfr_set_si (x, i, GMP_RNDN);
          inexact = mpfr_set_f (x, y, (mp_rnd_t) r);
          if (!MPFR_IS_ZERO(x) || !MPFR_IS_POS(x) || inexact)
            {
              printf ("mpfr_set_f(x,0) failed for %s, i = %d\n",
                      mpfr_print_rnd_mode ((mp_rnd_t) r), i);
              exit (1);
            }
        }
    }

  /* coverage test */
  mpf_set_prec (y, 2);
  mpfr_set_prec (x, 3 * mp_bits_per_limb);
  mpf_set_ui (y, 1);
  for (r = 0; r < mp_bits_per_limb; r++)
    {
      mpfr_urandomb (x, RANDS); /* to fill low limbs with random data */
      inexact = mpfr_set_f (x, y, GMP_RNDN);
      MPFR_ASSERTN(inexact == 0 && mpfr_cmp_ui_2exp (x, 1, r) == 0);
      mpf_mul_2exp (y, y, 1);
    }

  mpf_set_ui (y, 1);
  mpf_mul_2exp (y, y, ULONG_MAX);
  mpfr_set_f (x, y, GMP_RNDN);
  mpfr_set_ui (u, 1, GMP_RNDN);
  mpfr_mul_2ui (u, u, ULONG_MAX, GMP_RNDN);
  if (!mpfr_equal_p (x, u))
    {
      printf ("Error: mpfr_set_f (x, y, GMP_RNDN) for y = 2^ULONG_MAX\n");
      exit (1);
    }

  emax = mpfr_get_emax ();

  /* For mpf_mul_2exp, emax must fit in an unsigned long! */
  if (emax >= 0 && emax <= ULONG_MAX)
    {
      mpf_set_ui (y, 1);
      mpf_mul_2exp (y, y, emax);
      mpfr_set_f (x, y, GMP_RNDN);
      mpfr_set_ui_2exp (u, 1, emax, GMP_RNDN);
      if (!mpfr_equal_p (x, u))
        {
          printf ("Error: mpfr_set_f (x, y, GMP_RNDN) for y = 2^emax\n");
          exit (1);
        }
    }

  /* For mpf_mul_2exp, emax - 1 must fit in an unsigned long! */
  if (emax >= 1 && emax - 1 <= ULONG_MAX)
    {
      mpf_set_ui (y, 1);
      mpf_mul_2exp (y, y, emax - 1);
      mpfr_set_f (x, y, GMP_RNDN);
      mpfr_set_ui_2exp (u, 1, emax - 1, GMP_RNDN);
      if (!mpfr_equal_p (x, u))
        {
          printf ("Error: mpfr_set_f (x, y, GMP_RNDN) for y = 2^(emax-1)\n");
          exit (1);
        }
    }

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

  tests_end_mpfr ();
  return 0;
}