math/s_casinh_template.c

   1 /* Return arc hyperbolic sine for a complex float type.
   2    Copyright (C) 1997-2021 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    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <complex.h>
  21 #include <math.h>
  22
  23 CFLOAT
  24 M_DECL_FUNC (__casinh) (CFLOAT x)
  25 {
  26   CFLOAT res;
  27   int rcls = fpclassify (__real__ x);
  28   int icls = fpclassify (__imag__ x);
  29
  30   if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
  31     {
  32       if (icls == FP_INFINITE)
  33         {
  34           __real__ res = M_COPYSIGN (M_HUGE_VAL, __real__ x);
  35
  36           if (rcls == FP_NAN)
  37             __imag__ res = M_NAN;
  38           else
  39             __imag__ res = M_COPYSIGN ((rcls >= FP_ZERO
  40                                         ? M_MLIT (M_PI_2) : M_MLIT (M_PI_4)),
  41                                        __imag__ x);
  42         }
  43       else if (rcls <= FP_INFINITE)
  44         {
  45           __real__ res = __real__ x;
  46           if ((rcls == FP_INFINITE && icls >= FP_ZERO)
  47               || (rcls == FP_NAN && icls == FP_ZERO))
  48             __imag__ res = M_COPYSIGN (0, __imag__ x);
  49           else
  50             __imag__ res = M_NAN;
  51         }
  52       else
  53         {
  54           __real__ res = M_NAN;
  55           __imag__ res = M_NAN;
  56         }
  57     }
  58   else if (rcls == FP_ZERO && icls == FP_ZERO)
  59     {
  60       res = x;
  61     }
  62   else
  63     {
  64       res = M_SUF (__kernel_casinh) (x, 0);
  65     }
  66
  67   return res;
  68 }
  69
  70 declare_mgen_alias (__casinh, casinh)