| /* 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; |

| } |