1/* Return arc hyperbole sine for __float128 value.
2 Copyright (C) 1997, 1998 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
25casinhq (__complex128 x)
26{
27 __complex128 res;
28 int rcls = fpclassifyq (__real__ x);
29 int icls = fpclassifyq (__imag__ x);
30
31 if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
32 {
33 if (icls == QUADFP_INFINITE)
34 {
35 __real__ res = copysignq (HUGE_VALQ, __real__ x);
36
37 if (rcls == QUADFP_NAN)
38 __imag__ res = nanq ("");
39 else
40 __imag__ res = copysignq (rcls >= QUADFP_ZERO ? M_PI_2q : M_PI_4q,
41 __imag__ x);
42 }
43 else if (rcls <= QUADFP_INFINITE)
44 {
45 __real__ res = __real__ x;
46 if ((rcls == QUADFP_INFINITE && icls >= QUADFP_ZERO)
47 || (rcls == QUADFP_NAN && icls == QUADFP_ZERO))
48 __imag__ res = copysignq (0.0, __imag__ x);
49 else
50 __imag__ res = nanq ("");
51 }
52 else
53 {
54 __real__ res = nanq ("");
55 __imag__ res = nanq ("");
56 }
57 }
58 else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
59 {
60 res = x;
61 }
62 else
63 {
64 __complex128 y;
65
66 __real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0;
67 __imag__ y = 2.0 * __real__ x * __imag__ x;
68
69 y = csqrtq (y);
70
71 __real__ y += __real__ x;
72 __imag__ y += __imag__ x;
73
74 res = clogq (y);
75
76 /* Ensure zeros have correct sign and results are correct if
77 very close to branch cuts. */
78 __real__ res = copysignq (__real__ res, __real__ x);
79 __imag__ res = copysignq (__imag__ res, __imag__ x);
80 }
81
82 return res;
83}
84