1 | /* Return arc sine of complex float value. |
2 | Copyright (C) 1997-2016 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 <complex.h> |
21 | #include <math.h> |
22 | #include <math_private.h> |
23 | |
24 | |
25 | __complex__ float |
26 | __casinf (__complex__ float x) |
27 | { |
28 | __complex__ float res; |
29 | |
30 | if (isnan (__real__ x) || isnan (__imag__ x)) |
31 | { |
32 | if (__real__ x == 0.0) |
33 | { |
34 | res = x; |
35 | } |
36 | else if (isinf (__real__ x) || isinf (__imag__ x)) |
37 | { |
38 | __real__ res = __nanf ("" ); |
39 | __imag__ res = __copysignf (HUGE_VALF, __imag__ x); |
40 | } |
41 | else |
42 | { |
43 | __real__ res = __nanf ("" ); |
44 | __imag__ res = __nanf ("" ); |
45 | } |
46 | } |
47 | else |
48 | { |
49 | __complex__ float y; |
50 | |
51 | __real__ y = -__imag__ x; |
52 | __imag__ y = __real__ x; |
53 | |
54 | y = __casinhf (y); |
55 | |
56 | __real__ res = __imag__ y; |
57 | __imag__ res = -__real__ y; |
58 | } |
59 | |
60 | return res; |
61 | } |
62 | #ifndef __casinf |
63 | weak_alias (__casinf, casinf) |
64 | #endif |
65 | |