projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0413b54c | 1 | /* Round a 64-bit floating point value to the nearest integer. |
| 04277e02 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
| 0413b54c UD |
3 | This file is part of the GNU C Library. |
| 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. | |
| 0413b54c 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. |
| 0413b54c | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 0413b54c | 18 | |
| f29b6f17 | 19 | #define NO_MATH_REDIRECT |
| 1ed0291c | 20 | #include <math.h> |
| 51ea3b20 | 21 | #include <libm-alias-double.h> |
| 0413b54c UD |
22 | |
| 23 | double | |
| 24 | __rint (double x) | |
| 25 | { | |
| 26 | static const float TWO52 = 4503599627370496.0; | |
| 27 | ||
| 28 | if (fabs (x) < TWO52) | |
| 118bad87 UD |
29 | { |
| 30 | if (x > 0.0) | |
| 31 | { | |
| 32 | x += TWO52; | |
| 33 | x -= TWO52; | |
| 34 | } | |
| 35 | else if (x < 0.0) | |
| 36 | { | |
| b6299091 GK |
37 | x = TWO52 - x; |
| 38 | x = -(x - TWO52); | |
| 118bad87 UD |
39 | } |
| 40 | } | |
| 0413b54c UD |
41 | |
| 42 | return x; | |
| 43 | } | |
| 51ea3b20 | 44 | libm_alias_double (__rint, rint) |