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      1 /* Return arc sine of a complex float 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 casinq (__complex128 x)
     24 {
     25   __complex128 res;
     26 
     27   if (isnanq (__real__ x) || isnanq (__imag__ x))
     28     {
     29       if (__real__ x == 0)
     30 	{
     31 	  res = x;
     32 	}
     33       else if (isinfq (__real__ x) || isinfq (__imag__ x))
     34 	{
     35 	  __real__ res = nanq ("");
     36 	  __imag__ res = copysignq (HUGE_VALQ, __imag__ x);
     37 	}
     38       else
     39 	{
     40 	  __real__ res = nanq ("");
     41 	  __imag__ res = nanq ("");
     42 	}
     43     }
     44   else
     45     {
     46       __complex128 y;
     47 
     48       __real__ y = -__imag__ x;
     49       __imag__ y = __real__ x;
     50 
     51       y = casinhq (y);
     52 
     53       __real__ res = __imag__ y;
     54       __imag__ res = -__real__ y;
     55     }
     56 
     57   return res;
     58 }
     59