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/* Return positive difference between arguments.
Copyright (C) 1997-2016 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, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <math.h>
double
__fdim (double x, double y)
{
int clsx = fpclassify (x);
int clsy = fpclassify (y);
if (clsx == FP_NAN || clsy == FP_NAN)
/* Raise invalid flag for signaling but not quiet NaN. */
return x - y;
if (x <= y)
return 0.0;
double r = x - y;
if (fpclassify (r) == FP_INFINITE
&& clsx != FP_INFINITE && clsy != FP_INFINITE)
__set_errno (ERANGE);
return r;
}
weak_alias (__fdim, fdim)
#ifdef NO_LONG_DOUBLE
strong_alias (__fdim, __fdiml)
weak_alias (__fdim, fdiml)
#endif
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