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/* Test of rounding to nearest, breaking ties away from zero.
   Copyright (C) 2010-2023 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3, or (at your option)
   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#include <math.h>

#include "fpucw.h"
#include "isnanl-nolibm.h"
#include "minus-zero.h"
#include "infinity.h"
#include "nan.h"
#include "macros.h"

int
main ()
{
  DECL_LONG_DOUBLE_ROUNDING

  BEGIN_LONG_DOUBLE_ROUNDING ();

  /* See IEEE 754, section 6.3:
       "the sign of the result of the round floating-point number to
        integral value operation is the sign of the operand. These rules
        shall apply even when operands or results are zero or infinite."  */

  /* Zero.  */
  ASSERT (!signbit (roundl (0.0L)));
  ASSERT (!!signbit (roundl (minus_zerol)) == !!signbit (minus_zerol));
  /* Positive numbers.  */
  ASSERT (!signbit (roundl (0.3L)));
  ASSERT (!signbit (roundl (0.7L)));
  /* Negative numbers.  */
  ASSERT (!!signbit (roundl (-0.3L)) == !!signbit (minus_zerol));
  ASSERT (!!signbit (roundl (-0.7L)) == !!signbit (minus_zerol));

  /* [MX] shaded specification in POSIX.  */

  /* NaN.  */
  ASSERT (isnanl (roundl (NaNl ())));
  /* Infinity.  */
  ASSERT (roundl (Infinityl ()) == Infinityl ());
  ASSERT (roundl (- Infinityl ()) == - Infinityl ());

  return 0;
}
kc3-lang/gnulib/tests/test-roundl-ieee.c

Commit

tests/test-roundl-ieee.c
