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377a515b | 1 | /* Return positive difference between arguments. |
2b778ceb | 2 | Copyright (C) 1997-2021 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 | 17 | License along with the GNU C Library; if not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
377a515b | 19 | |
f0c281e0 | 20 | #include <errno.h> |
377a515b | 21 | #include <math.h> |
aaee3cd8 | 22 | #include <math-narrow-eval.h> |
377a515b | 23 | |
7b7c3945 PM |
24 | FLOAT |
25 | M_DECL_FUNC (__fdim) (FLOAT x, FLOAT y) | |
377a515b | 26 | { |
4fea2cda | 27 | if (islessequal (x, y)) |
7b7c3945 | 28 | return 0; |
f0c281e0 | 29 | |
7b7c3945 | 30 | FLOAT r = math_narrow_eval (x - y); |
4fea2cda | 31 | if (isinf (r) && !isinf (x) && !isinf (y)) |
f0c281e0 UD |
32 | __set_errno (ERANGE); |
33 | ||
34 | return r; | |
377a515b | 35 | } |
7b7c3945 | 36 | declare_mgen_alias (__fdim, fdim); |