sysdeps/libm-ieee754/s_ccoshl.c

   1 /* Complex cosine hyperbole function for long double.
   2    Copyright (C) 1997 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <complex.h>
  22 #include <math.h>
  23
  24
  25 __complex__ long double
  26 __ccoshl (__complex__ long double x)
  27 {
  28   __complex__ long double retval;
  29
  30   __real__ x = fabsl (__real__ x);
  31
  32   if (isfinite (__real__ x))
  33     {
  34       if (isfinite (__imag__ x))
  35         {
  36           long double exp_val = __expl (__real__ x);
  37           long double rec_exp_val = 1.0 / exp_val;
  38
  39           __real__ retval = (0.5 * (exp_val + rec_exp_val)
  40                              * __cosl (__imag__ x));
  41           __imag__ retval = (0.5 * (exp_val + rec_exp_val)
  42                              * __sinl (__imag__ x));
  43         }
  44       else
  45         {
  46           if (__real__ x == 0)
  47             {
  48               __imag__ retval = 0.0;
  49               __real__ retval = __nanl ("") + __nanl ("");
  50             }
  51           else
  52             {
  53               __real__ retval = __nanl ("");
  54               __imag__ retval = __nanl ("") + __nanl ("");
  55             }
  56         }
  57     }
  58   else if (__isinfl (__real__ x))
  59     {
  60       if (__imag__ x == 0.0)
  61         {
  62           __real__ retval = HUGE_VALL;
  63           __imag__ retval = __imag__ x;
  64         }
  65       else if (isfinite (__imag__ x))
  66         {
  67           __real__ retval = __copysignl (HUGE_VALL, __cosl (__imag__ x));
  68           __imag__ retval = __copysignl (HUGE_VALL, __sinl (__imag__ x));
  69         }
  70       else
  71         {
  72           /* The addition raises the invalid exception.  */
  73           __real__ retval = HUGE_VALL;
  74           __imag__ retval = __nanl ("") + __nanl ("");
  75         }
  76     }
  77   else
  78     {
  79       if (__imag__ x == 0.0)
  80         {
  81           __real__ retval = __nanl ("");
  82           __imag__ retval = __imag__ x;
  83         }
  84       else
  85         {
  86           __real__ retval = __nanl ("");
  87           __imag__ retval = __nanl ("");
  88         }
  89     }
  90
  91   return retval;
  92 }
  93 weak_alias (__ccoshl, ccoshl)