sysdeps/libm-ieee754/s_fdiml.c

   1 /* Return positive difference between arguments.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <math.h>
  22
  23 long double
  24 __fdiml (long double x, long double y)
  25 {
  26   int clsx = fpclassify (x);
  27   int clsy = fpclassify (y);
  28
  29   if (clsx == FP_NAN || clsy == FP_NAN
  30       || (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE))
  31     /* Raise invalid flag.  */
  32     return x - y;
  33
  34   return x < y ? 0 : x - y;
  35 }
  36 weak_alias (__fdiml, fdiml)