math/s_casinh_template.c

   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)