lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Return arc sine of complex long double value. |
| 2 | Copyright (C) 1997-2015 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 <complex.h> |
| 21 | #include <math.h> |
| 22 | #include <math_private.h> |
| 23 | |
| 24 | |
| 25 | __complex__ long double |
| 26 | __casinl (__complex__ long double x) |
| 27 | { |
| 28 | __complex__ long double res; |
| 29 | |
| 30 | if (isnan (__real__ x) || isnan (__imag__ x)) |
| 31 | { |
| 32 | if (__real__ x == 0.0) |
| 33 | { |
| 34 | res = x; |
| 35 | } |
| 36 | else if (__isinf_nsl (__real__ x) || __isinf_nsl (__imag__ x)) |
| 37 | { |
| 38 | __real__ res = __nanl (""); |
| 39 | __imag__ res = __copysignl (HUGE_VALL, __imag__ x); |
| 40 | } |
| 41 | else |
| 42 | { |
| 43 | __real__ res = __nanl (""); |
| 44 | __imag__ res = __nanl (""); |
| 45 | } |
| 46 | } |
| 47 | else |
| 48 | { |
| 49 | __complex__ long double y; |
| 50 | |
| 51 | __real__ y = -__imag__ x; |
| 52 | __imag__ y = __real__ x; |
| 53 | |
| 54 | y = __casinhl (y); |
| 55 | |
| 56 | __real__ res = __imag__ y; |
| 57 | __imag__ res = -__real__ y; |
| 58 | } |
| 59 | |
| 60 | return res; |
| 61 | } |
| 62 | weak_alias (__casinl, casinl) |