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/* Return positive difference between arguments.

   Copyright (C) 1997, 2004, 2009 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C 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 C 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 C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <errno.h>

#include "quadmath-imp.h"

__float128

fdimq (__float128 x, __float128 y)

{

  int clsx = fpclassifyq (x);

  int clsy = fpclassifyq (y);

  if (clsx == QUADFP_NAN || clsy == QUADFP_NAN

      || (y < 0 && clsx == QUADFP_INFINITE && clsy == QUADFP_INFINITE))

    /* Raise invalid flag.  */

    return x - y;

  if (x <= y)

    return 0.0Q;

  __float128 r = x - y;

  if (isinfq (r))

    errno = ERANGE;

  return r;

}