1 | /* Return arc sine of a complex float type. |
2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <complex.h> |
20 | #include <math.h> |
21 | |
22 | |
23 | CFLOAT |
24 | M_DECL_FUNC (__casin) (CFLOAT x) |
25 | { |
26 | CFLOAT res; |
27 | |
28 | if (isnan (__real__ x) || isnan (__imag__ x)) |
29 | { |
30 | if (__real__ x == 0) |
31 | { |
32 | res = x; |
33 | } |
34 | else if (isinf (__real__ x) || isinf (__imag__ x)) |
35 | { |
36 | __real__ res = M_NAN; |
37 | __imag__ res = M_COPYSIGN (M_HUGE_VAL, __imag__ x); |
38 | } |
39 | else |
40 | { |
41 | __real__ res = M_NAN; |
42 | __imag__ res = M_NAN; |
43 | } |
44 | } |
45 | else |
46 | { |
47 | CFLOAT y; |
48 | |
49 | __real__ y = -__imag__ x; |
50 | __imag__ y = __real__ x; |
51 | |
52 | y = M_SUF (__casinh) (y); |
53 | |
54 | __real__ res = __imag__ y; |
55 | __imag__ res = -__real__ y; |
56 | } |
57 | |
58 | return res; |
59 | } |
60 | |
61 | declare_mgen_alias (__casin, casin) |
62 | |