1/* Return positive difference between arguments.
2 Copyright (C) 1997-2016 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 Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the 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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <errno.h>
21#include <math.h>
22#include <math_private.h>
23
24double
25__fdim (double x, double y)
26{
27 if (islessequal (x, y))
28 return 0.0;
29
30 double r = math_narrow_eval (x - y);
31 if (isinf (r) && !isinf (x) && !isinf (y))
32 __set_errno (ERANGE);
33
34 return r;
35}
36weak_alias (__fdim, fdim)
37#ifdef NO_LONG_DOUBLE
38strong_alias (__fdim, __fdiml)
39weak_alias (__fdim, fdiml)
40#endif
41