gcc/mpfr/tests/tcomparisons.c

/* Test file for mpfr_greater_p, mpfr_greaterequal_p, mpfr_less_p,
   mpfr_lessequal_p, mpfr_lessgreater_p, mpfr_equal_p, mpfr_unordered_p
   functions.

Copyright 2003, 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 "mpfr-test.h"

static void
cmp_tests (void)
{
  mpfr_t x, y;
  long i;

  mpfr_inits (x, y, (mpfr_ptr) 0);
  for (i = 0; i < 80000; i++)
    {
      mp_prec_t precx, precy;
      int signx, signy, cmp;
      unsigned int cmpbool = 0;

      precx = (randlimb () % 17) * 11 + MPFR_PREC_MIN;
      precy = (randlimb () % 17) * 11 + MPFR_PREC_MIN;
      mpfr_set_prec (x, precx);
      mpfr_set_prec (y, precy);
      mpfr_urandomb (x, RANDS);
      mpfr_urandomb (y, RANDS);
      signx = randlimb () & 1;
      signy = randlimb () % 256 ? signx : 1 - signx;
      /* signy = signx most of the time (most interesting case) */
      if (signx)
        mpfr_neg (x, x, GMP_RNDN);
      if (signy)
        mpfr_neg (y, y, GMP_RNDN);
      if (i <= 1)
        mpfr_set_nan (x);
      if (i == 0 || i == 2)
        mpfr_set_nan (y);
      if (mpfr_greater_p (x, y))
        cmpbool |= 0x01;
      if (mpfr_greaterequal_p (x, y))
        cmpbool |= 0x02;
      if (mpfr_less_p (x, y))
        cmpbool |= 0x04;
      if (mpfr_lessequal_p (x, y))
        cmpbool |= 0x08;
      if (mpfr_lessgreater_p (x, y))
        cmpbool |= 0x10;
      if (mpfr_equal_p (x, y))
        cmpbool |= 0x20;
      if (mpfr_unordered_p (x, y))
        cmpbool |= 0x40;
      if ((i <= 2 && cmpbool != 0x40) ||
          (i > 2 && (cmp = mpfr_cmp (x, y),
                     (cmp == 0 && cmpbool != 0x2a) ||
                     (cmp < 0 && cmpbool != 0x1c) ||
                     (cmp > 0 && cmpbool != 0x13))))
        {
          printf ("Error in cmp_tests for\nx = ");
          mpfr_out_str (stdout, 2, 0, x, GMP_RNDN);
          printf (" and\ny = ");
          mpfr_out_str (stdout, 2, 0, y, GMP_RNDN);
          printf ("\n");
          exit (1);
        }
    }
  mpfr_clears (x, y, (mpfr_ptr) 0);
}

static void
eq_tests (void)
{
  mpfr_t x, y;
  long i;

  mpfr_inits (x, y, (mpfr_ptr) 0);
  for (i = 0; i < 20000; i++)
    {
      mp_prec_t precx;

      precx = (randlimb () % 17) * 11 + MPFR_PREC_MIN;
      mpfr_set_prec (x, precx);
      mpfr_set_prec (y, precx + (randlimb () % 64));
      mpfr_urandomb (x, RANDS);
      if (randlimb () & 1)
        mpfr_neg (x, x, GMP_RNDN);
      mpfr_set (y, x, GMP_RNDN);  /* exact -> x = y */
      if (mpfr_greater_p (x, y) || !mpfr_greaterequal_p (x, y) ||
          mpfr_less_p (x, y) || !mpfr_lessequal_p (x, y) ||
          mpfr_lessgreater_p (x, y) || !mpfr_equal_p (x, y) ||
          mpfr_unordered_p (x, y))
        {
          printf ("Error in eq_tests for x = ");
          mpfr_out_str (stdout, 2, 0, x, GMP_RNDN);
          printf ("\n");
          exit (1);
        }
    }
  mpfr_clears (x, y, (mpfr_ptr) 0);
}

int
main (void)
{
  tests_start_mpfr ();
  cmp_tests ();
  eq_tests ();
  tests_end_mpfr ();
  return 0;
}