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c50eee19 | 1 | /* Return arc sine of a complex float type. |
6d7e8eda | 2 | Copyright (C) 1997-2023 Free Software Foundation, Inc. |
ffb84f5e | 3 | This file is part of the GNU C Library. |
ffb84f5e PM |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
ffb84f5e PM |
18 | |
19 | #include <complex.h> | |
20 | #include <math.h> | |
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21 | |
22 | ||
c50eee19 PM |
23 | CFLOAT |
24 | M_DECL_FUNC (__casin) (CFLOAT x) | |
ffb84f5e | 25 | { |
c50eee19 | 26 | CFLOAT res; |
ffb84f5e PM |
27 | |
28 | if (isnan (__real__ x) || isnan (__imag__ x)) | |
29 | { | |
c50eee19 | 30 | if (__real__ x == 0) |
ffb84f5e PM |
31 | { |
32 | res = x; | |
33 | } | |
34 | else if (isinf (__real__ x) || isinf (__imag__ x)) | |
35 | { | |
c50eee19 PM |
36 | __real__ res = M_NAN; |
37 | __imag__ res = M_COPYSIGN (M_HUGE_VAL, __imag__ x); | |
ffb84f5e PM |
38 | } |
39 | else | |
40 | { | |
c50eee19 PM |
41 | __real__ res = M_NAN; |
42 | __imag__ res = M_NAN; | |
ffb84f5e PM |
43 | } |
44 | } | |
45 | else | |
46 | { | |
c50eee19 | 47 | CFLOAT y; |
ffb84f5e PM |
48 | |
49 | __real__ y = -__imag__ x; | |
50 | __imag__ y = __real__ x; | |
51 | ||
c50eee19 | 52 | y = M_SUF (__casinh) (y); |
ffb84f5e PM |
53 | |
54 | __real__ res = __imag__ y; | |
55 | __imag__ res = -__real__ y; | |
56 | } | |
57 | ||
58 | return res; | |
59 | } | |
c50eee19 PM |
60 | |
61 | declare_mgen_alias (__casin, casin) |