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 | |
23 | float |
24 | __fdimf (float x, float y) |
25 | { |
26 | int clsx = fpclassify (x); |
27 | int clsy = fpclassify (y); |
28 | |
29 | if (clsx == FP_NAN || clsy == FP_NAN) |
30 | /* Raise invalid flag for signaling but not quiet NaN. */ |
31 | return x - y; |
32 | |
33 | if (x <= y) |
34 | return 0.0f; |
35 | |
36 | float r = x - y; |
37 | if (fpclassify (r) == FP_INFINITE |
38 | && clsx != FP_INFINITE && clsy != FP_INFINITE) |
39 | __set_errno (ERANGE); |
40 | |
41 | return r; |
42 | } |
43 | weak_alias (__fdimf, fdimf) |
44 | |