math/s_casinh_template.c

   1 /* Return arc hyperbolic sine for a complex float type.
   2    Copyright (C) 1997-2017 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <complex.h>
  21 #include <math.h>
  22 #include <math_private.h>
  23
  24 CFLOAT
  25 M_DECL_FUNC (__casinh) (CFLOAT x)
  26 {
  27   CFLOAT res;
  28   int rcls = fpclassify (__real__ x);
  29   int icls = fpclassify (__imag__ x);
  30
  31   if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
  32     {
  33       if (icls == FP_INFINITE)
  34         {
  35           __real__ res = M_COPYSIGN (M_HUGE_VAL, __real__ x);
  36
  37           if (rcls == FP_NAN)
  38             __imag__ res = M_NAN;
  39           else
  40             __imag__ res = M_COPYSIGN ((rcls >= FP_ZERO
  41                                         ? M_MLIT (M_PI_2) : M_MLIT (M_PI_4)),
  42                                        __imag__ x);
  43         }
  44       else if (rcls <= FP_INFINITE)
  45         {
  46           __real__ res = __real__ x;
  47           if ((rcls == FP_INFINITE && icls >= FP_ZERO)
  48               || (rcls == FP_NAN && icls == FP_ZERO))
  49             __imag__ res = M_COPYSIGN (0, __imag__ x);
  50           else
  51             __imag__ res = M_NAN;
  52         }
  53       else
  54         {
  55           __real__ res = M_NAN;
  56           __imag__ res = M_NAN;
  57         }
  58     }
  59   else if (rcls == FP_ZERO && icls == FP_ZERO)
  60     {
  61       res = x;
  62     }
  63   else
  64     {
  65       res = M_SUF (__kernel_casinh) (x, 0);
  66     }
  67
  68   return res;
  69 }
  70
  71 declare_mgen_alias (__casinh, casinh)
  72
  73 #if M_LIBM_NEED_COMPAT (casinh)
  74 declare_mgen_libm_compat (__casinh, casinh)
  75 #endif