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      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 (at) 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
     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