niceSOFT/mpfr | Gitverse

src/sgn.c
40 строк1 KB
Vincent Lefèvre
03 янв 2018, 13:53
03 янв 2018, 13:532fce388
/* mpfr_sgn -- Sign of a floating point number.

Copyright 2003-2004, 2006-2018 Free Software Foundation, Inc.
Contributed by the AriC and Caramba 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 3 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.LESSER.  If not, see
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */

#include "mpfr-impl.h"

int
(mpfr_sgn) (mpfr_srcptr a)
{
  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (a)))
    {
      if (MPFR_LIKELY (MPFR_IS_ZERO (a)))
        return 0;
      if (MPFR_UNLIKELY (MPFR_IS_NAN (a)))
        {
          MPFR_SET_ERANGEFLAG ();
          return 0;
        }
      /* Remains infinity, handled by the return below. */
    }
  return MPFR_INT_SIGN (a);
}