1 /* Return arc sine of a complex float type.
2    Copyright (C) 1997-2018 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 "quadmath-imp.h"
21 
22 __complex128
casinq(__complex128 x)23 casinq (__complex128 x)
24 {
25   __complex128 res;
26 
27   if (isnanq (__real__ x) || isnanq (__imag__ x))
28     {
29       if (__real__ x == 0)
30 	{
31 	  res = x;
32 	}
33       else if (isinfq (__real__ x) || isinfq (__imag__ x))
34 	{
35 	  __real__ res = nanq ("");
36 	  __imag__ res = copysignq (HUGE_VALQ, __imag__ x);
37 	}
38       else
39 	{
40 	  __real__ res = nanq ("");
41 	  __imag__ res = nanq ("");
42 	}
43     }
44   else
45     {
46       __complex128 y;
47 
48       __real__ y = -__imag__ x;
49       __imag__ y = __real__ x;
50 
51       y = casinhq (y);
52 
53       __real__ res = __imag__ y;
54       __imag__ res = -__real__ y;
55     }
56 
57   return res;
58 }
59