1/* Return arc sine of complex __float128 value.
2 Copyright (C) 1997 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, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
20
21#include "quadmath-imp.h"
22
23
24__complex128
25casinq (__complex128 x)
26{
27 __complex128 res;
28
29 if (isnanq (__real__ x) || isnanq (__imag__ x))
30 {
31 if (__real__ x == 0.0)
32 {
33 res = x;
34 }
35 else if (isinfq (__real__ x) || isinfq (__imag__ x))
36 {
37 __real__ res = nanq ("");
38 __imag__ res = copysignq (HUGE_VALQ, __imag__ x);
39 }
40 else
41 {
42 __real__ res = nanq ("");
43 __imag__ res = nanq ("");
44 }
45 }
46 else
47 {
48 __complex128 y;
49
50 __real__ y = -__imag__ x;
51 __imag__ y = __real__ x;
52
53 y = casinhq (y);
54
55 __real__ res = __imag__ y;
56 __imag__ res = -__real__ y;
57 }
58
59 return res;
60}
61