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377a515b | 1 | /* Return positive difference between arguments. |
dff8da6b | 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
377a515b | 3 | This file is part of the GNU C Library. |
377a515b UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
377a515b UD |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
377a515b | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
377a515b | 18 | |
f0c281e0 | 19 | #include <errno.h> |
377a515b | 20 | #include <math.h> |
aaee3cd8 | 21 | #include <math-narrow-eval.h> |
377a515b | 22 | |
7b7c3945 PM |
23 | FLOAT |
24 | M_DECL_FUNC (__fdim) (FLOAT x, FLOAT y) | |
377a515b | 25 | { |
4fea2cda | 26 | if (islessequal (x, y)) |
7b7c3945 | 27 | return 0; |
f0c281e0 | 28 | |
7b7c3945 | 29 | FLOAT r = math_narrow_eval (x - y); |
4fea2cda | 30 | if (isinf (r) && !isinf (x) && !isinf (y)) |
f0c281e0 UD |
31 | __set_errno (ERANGE); |
32 | ||
33 | return r; | |
377a515b | 34 | } |
7b7c3945 | 35 | declare_mgen_alias (__fdim, fdim); |