gcc/libquadmath/math/fdimq.c

44 lines
1.4 KiB
C

/* 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;
}