1  /* Return arc hyperbolic sine for a complex float type.
       2     Copyright (C) 1997-2023 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  
      22  CFLOAT
      23  M_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  
      69  declare_mgen_alias (__casinh, casinh)