1 | /* Return arc hyperbolic sine for 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 | CFLOAT |
23 | M_DECL_FUNC (__casinh) (CFLOAT x) |
24 | { |
25 | CFLOAT res; |
26 | int rcls = fpclassify (__real__ x); |
27 | int icls = fpclassify (__imag__ x); |
28 | |
29 | if (rcls <= FP_INFINITE || icls <= FP_INFINITE) |
30 | { |
31 | if (icls == FP_INFINITE) |
32 | { |
33 | __real__ res = M_COPYSIGN (M_HUGE_VAL, __real__ x); |
34 | |
35 | if (rcls == FP_NAN) |
36 | __imag__ res = M_NAN; |
37 | else |
38 | __imag__ res = M_COPYSIGN ((rcls >= FP_ZERO |
39 | ? M_MLIT (M_PI_2) : M_MLIT (M_PI_4)), |
40 | __imag__ x); |
41 | } |
42 | else if (rcls <= FP_INFINITE) |
43 | { |
44 | __real__ res = __real__ x; |
45 | if ((rcls == FP_INFINITE && icls >= FP_ZERO) |
46 | || (rcls == FP_NAN && icls == FP_ZERO)) |
47 | __imag__ res = M_COPYSIGN (0, __imag__ x); |
48 | else |
49 | __imag__ res = M_NAN; |
50 | } |
51 | else |
52 | { |
53 | __real__ res = M_NAN; |
54 | __imag__ res = M_NAN; |
55 | } |
56 | } |
57 | else if (rcls == FP_ZERO && icls == FP_ZERO) |
58 | { |
59 | res = x; |
60 | } |
61 | else |
62 | { |
63 | res = M_SUF (__kernel_casinh) (x, 0); |
64 | } |
65 | |
66 | return res; |
67 | } |
68 | |
69 | declare_mgen_alias (__casinh, casinh) |
70 | |