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 | |
24 | double |
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 | } |
36 | weak_alias (__fdim, fdim) |
37 | #ifdef NO_LONG_DOUBLE |
38 | strong_alias (__fdim, __fdiml) |
39 | weak_alias (__fdim, fdiml) |
40 | #endif |
41 | |