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
23CFLOAT
24M_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
61declare_mgen_alias (__casin, casin)
62

source code of glibc/math/s_casin_template.c