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377a515b | 1 | /* Return positive difference between arguments. |
f0c281e0 | 2 | Copyright (C) 1997, 2004, 2009 Free Software Foundation, Inc. |
377a515b UD |
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 | |
41bdb6e2 AJ |
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. | |
377a515b UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
377a515b | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
377a515b | 19 | |
f0c281e0 | 20 | #include <errno.h> |
377a515b UD |
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 | || (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE)) | |
31 | /* Raise invalid flag. */ | |
32 | return x - y; | |
33 | ||
f0c281e0 UD |
34 | if (x <= y) |
35 | return 0.0f; | |
36 | ||
37 | float r = x - y; | |
38 | if (fpclassify (r) == FP_INFINITE) | |
39 | __set_errno (ERANGE); | |
40 | ||
41 | return r; | |
377a515b UD |
42 | } |
43 | weak_alias (__fdimf, fdimf) |