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377a515b | 1 | /* Return positive difference between arguments. |
b168057a | 2 | Copyright (C) 1997-2015 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 | double | |
24 | __fdim (double x, double y) | |
25 | { | |
26 | int clsx = fpclassify (x); | |
27 | int clsy = fpclassify (y); | |
28 | ||
acd06bb1 JM |
29 | if (clsx == FP_NAN || clsy == FP_NAN) |
30 | /* Raise invalid flag for signaling but not quiet NaN. */ | |
377a515b UD |
31 | return x - y; |
32 | ||
f0c281e0 UD |
33 | if (x <= y) |
34 | return 0.0; | |
35 | ||
36 | double r = x - y; | |
acd06bb1 JM |
37 | if (fpclassify (r) == FP_INFINITE |
38 | && clsx != FP_INFINITE && clsy != FP_INFINITE) | |
f0c281e0 UD |
39 | __set_errno (ERANGE); |
40 | ||
41 | return r; | |
377a515b UD |
42 | } |
43 | weak_alias (__fdim, fdim) | |
5649a1d6 UD |
44 | #ifdef NO_LONG_DOUBLE |
45 | strong_alias (__fdim, __fdiml) | |
46 | weak_alias (__fdim, fdiml) | |
47 | #endif |