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
22CFLOAT
23M_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
69declare_mgen_alias (__casinh, casinh)
70

source code of glibc/math/s_casinh_template.c