1 /* Return arc hyperbolic cosine for a complex type.
2    Copyright (C) 1997-2018 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 "quadmath-imp.h"
21 
22 __complex128
cacoshq(__complex128 x)23 cacoshq (__complex128 x)
24 {
25   __complex128 res;
26   int rcls = fpclassifyq (__real__ x);
27   int icls = fpclassifyq (__imag__ x);
28 
29   if (rcls <= QUADFP_INFINITE || icls <= QUADFP_INFINITE)
30     {
31       if (icls == QUADFP_INFINITE)
32 	{
33 	  __real__ res = HUGE_VALQ;
34 
35 	  if (rcls == QUADFP_NAN)
36 	    __imag__ res = nanq ("");
37 	  else
38 	    __imag__ res = copysignq ((rcls == QUADFP_INFINITE
39 					? (__real__ x < 0
40 					   ? M_PIq - M_PI_4q
41 					   : M_PI_4q)
42 					: M_PI_2q), __imag__ x);
43 	}
44       else if (rcls == QUADFP_INFINITE)
45 	{
46 	  __real__ res = HUGE_VALQ;
47 
48 	  if (icls >= QUADFP_ZERO)
49 	    __imag__ res = copysignq (signbitq (__real__ x)
50 				       ? M_PIq : 0, __imag__ x);
51 	  else
52 	    __imag__ res = nanq ("");
53 	}
54       else
55 	{
56 	  __real__ res = nanq ("");
57 	  if (rcls == QUADFP_ZERO)
58 	    __imag__ res = M_PI_2q;
59 	  else
60 	    __imag__ res = nanq ("");
61 	}
62     }
63   else if (rcls == QUADFP_ZERO && icls == QUADFP_ZERO)
64     {
65       __real__ res = 0;
66       __imag__ res = copysignq (M_PI_2q, __imag__ x);
67     }
68   else
69     {
70       __complex128 y;
71 
72       __real__ y = -__imag__ x;
73       __imag__ y = __real__ x;
74 
75       y = __quadmath_kernel_casinhq (y, 1);
76 
77       if (signbitq (__imag__ x))
78 	{
79 	  __real__ res = __real__ y;
80 	  __imag__ res = -__imag__ y;
81 	}
82       else
83 	{
84 	  __real__ res = -__real__ y;
85 	  __imag__ res = __imag__ y;
86 	}
87     }
88 
89   return res;
90 }
91