| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 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 | long double |
| 24 | __fdiml (long double x, long double 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 | long double 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 (__fdiml, fdiml) |