gcc/mpfr/tests/tgeneric_ui.c

/* Generic test file for functions with one mpfr_t argument and an integer.

Copyright 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. */

/* define INTEGER_TYPE to what we want */
#ifndef INTEGER_TYPE
# define INTEGER_TYPE mp_limb_t
#endif
#ifndef RAND_FUNCTION
# define RAND_FUNCTION(x) mpfr_urandomb ((x), RANDS)
#endif
#ifndef INT_RAND_FUNCTION
# define INT_RAND_FUNCTION() (INTEGER_TYPE) randlimb ()
#endif

static void
test_generic_ui (mp_prec_t p0, mp_prec_t p1, unsigned int N)
{
  mp_prec_t prec, yprec;
  mpfr_t x, y, z, t;
  INTEGER_TYPE u;
  mp_rnd_t rnd;
  int inexact, compare, compare2;
  unsigned int n;

  mpfr_init (x);
  mpfr_init (y);
  mpfr_init (z);
  mpfr_init (t);

  /* generic test */
  for (prec = p0; prec <= p1; prec++)
    {
      mpfr_set_prec (x, prec);
      mpfr_set_prec (z, prec);
      mpfr_set_prec (t, prec);
      yprec = prec + 10;

      for (n = 0; n <= N; n++)
        {
          if (n > 1 || prec < p1)
            RAND_FUNCTION (x);
          else
            {
              /* Special cases tested in precision p1 if n <= 1. */
              mpfr_set_si (x, n == 0 ? 1 : -1, GMP_RNDN);
              mpfr_set_exp (x, mpfr_get_emin ());
            }
          u = INT_RAND_FUNCTION ();
          rnd = RND_RAND ();
          mpfr_set_prec (y, yprec);
          compare = TEST_FUNCTION (y, x, u, rnd);
          if (mpfr_can_round (y, yprec, rnd, rnd, prec))
            {
              mpfr_set (t, y, rnd);
              inexact = TEST_FUNCTION (z, x, u, rnd);
              if (mpfr_cmp (t, z))
                {
                  printf ("results differ for x=");
                  mpfr_out_str (stdout, 2, prec, x, GMP_RNDN);
                  printf ("\nu=%lu", (unsigned long) u);
                  printf (" prec=%lu rnd_mode=%s\n",
                          (unsigned long ) prec, mpfr_print_rnd_mode (rnd));
#ifdef TEST_FUNCTION_NAME
                  printf ("Function: %s\n", TEST_FUNCTION_NAME);
#endif
                  printf ("got      ");
                  mpfr_out_str (stdout, 2, prec, z, GMP_RNDN);
                  puts ("");
                  printf ("expected ");
                  mpfr_out_str (stdout, 2, prec, t, GMP_RNDN);
                  puts ("");
                  printf ("approx  ");
                  mpfr_print_binary (y);
                  puts ("");
                  exit (1);
                }
              compare2 = mpfr_cmp (t, y);
              /* if rounding to nearest, cannot know the sign of t - f(x)
                 because of composed rounding: y = o(f(x)) and t = o(y) */
              if (compare * compare2 >= 0)
                compare = compare + compare2;
              else
                compare = inexact; /* cannot determine sign(t-f(x)) */
              if (((inexact == 0) && (compare != 0)) ||
                  ((inexact > 0) && (compare <= 0)) ||
                  ((inexact < 0) && (compare >= 0)))
                {
                  printf ("Wrong inexact flag for rnd=%s: expected %d, got %d"
                          "\n", mpfr_print_rnd_mode (rnd), compare, inexact);
                  printf ("x="); mpfr_print_binary (x); puts ("");
                  printf ("u=%lu", (unsigned long) u);
                  printf ("y="); mpfr_print_binary (y); puts ("");
                  printf ("t="); mpfr_print_binary (t); puts ("");
                  exit (1);
                }
            }
        }
    }

  mpfr_clear (x);
  mpfr_clear (y);
  mpfr_clear (z);
  mpfr_clear (t);
}

#undef RAND_FUNCTION
#undef INTEGER_TYPE
#undef TEST_FUNCTION
#undef TEST_FUNCTION_NAME
#undef test_generic_ui
#undef INT_RAND_FUNCTION