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1 | /* Return arc hyperbole sine for double 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 | __complex__ double | |
25 | __casinh (__complex__ double x) | |
26 | { | |
27 | __complex__ double res; | |
28 | int rcls = fpclassify (__real__ x); | |
29 | int icls = fpclassify (__imag__ x); | |
30 | ||
31 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE) | |
32 | { | |
33 | if (icls == FP_INFINITE) | |
34 | { | |
35 | __real__ res = __copysign (HUGE_VAL, __real__ x); | |
36 | ||
37 | if (rcls == FP_NAN) | |
38 | __imag__ res = __nan (""); | |
39 | else | |
40 | __imag__ res = __copysign (rcls >= FP_ZERO ? M_PI_2 : M_PI_4, | |
41 | __imag__ x); | |
42 | } | |
43 | else if (rcls <= FP_INFINITE) | |
44 | { | |
45 | __real__ res = __real__ x; | |
46 | if ((rcls == FP_INFINITE && icls >= FP_ZERO) | |
47 | || (rcls == FP_NAN && icls == FP_ZERO)) | |
48 | __imag__ res = __copysign (0.0, __imag__ x); | |
49 | else | |
50 | __imag__ res = __nan (""); | |
51 | } | |
52 | else | |
53 | { | |
54 | __real__ res = __nan (""); | |
55 | __imag__ res = __nan (""); | |
56 | } | |
57 | } | |
58 | else if (rcls == FP_ZERO && icls == FP_ZERO) | |
59 | { | |
60 | res = x; | |
61 | } | |
62 | else | |
63 | { | |
64 | res = __kernel_casinh (x, 0); | |
65 | } | |
66 | ||
67 | return res; | |
68 | } | |
69 | weak_alias (__casinh, casinh) | |
70 | #ifdef NO_LONG_DOUBLE | |
71 | strong_alias (__casinh, __casinhl) | |
72 | weak_alias (__casinh, casinhl) | |
73 | #endif |