]>
Commit | Line | Data |
---|---|---|
d032e0d2 | 1 | /* Compute x^2 + y^2 - 1, without large cancellation error. |
d4697bc9 | 2 | Copyright (C) 2012-2014 Free Software Foundation, Inc. |
d032e0d2 JM |
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 | |
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. | |
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <math.h> | |
20 | #include <math_private.h> | |
21 | #include <float.h> | |
22 | ||
23 | #if FLT_EVAL_METHOD == 0 | |
24 | ||
25 | # include <sysdeps/ieee754/dbl-64/x2y2m1.c> | |
26 | ||
27 | #else | |
28 | ||
29 | /* Return X^2 + Y^2 - 1, computed without large cancellation error. | |
30 | It is given that 1 > X >= Y >= epsilon / 2, and that either X >= | |
31 | 0.75 or Y >= 0.5. */ | |
32 | ||
33 | double | |
34 | __x2y2m1 (double x, double y) | |
35 | { | |
36 | return (double) __x2y2m1l (x, y); | |
37 | } | |
38 | ||
39 | #endif |