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 #include "math_private.h"
  25
  26
  27 __complex__ long double
  28 __ccoshl (__complex__ long double x)
  29 {
  30   __complex__ long double retval;
  31   int rcls = fpclassify (__real__ x);
  32   int icls = fpclassify (__imag__ x);
  33
  34   __real__ x = fabsl (__real__ x);
  35
  36   if (rcls >= FP_ZERO)
  37     {
  38       /* Real part is finite.  */
  39       if (icls >= FP_ZERO)
  40         {
  41           /* Imaginary part is finite.  */
  42           long double cosh_val = __ieee754_coshl (__real__ x);
  43           long double sinix, cosix;
  44
  45           __sincosl (__imag__ x, &sinix, &cosix);
  46
  47           __real__ retval = cosh_val * cosix;
  48           __imag__ retval = cosh_val * sinix;
  49         }
  50       else
  51         {
  52           __imag__ retval = __real__ x == 0.0 ? 0.0 : __nanl ("");
  53           __real__ retval = __nanl ("") + __nanl ("");
  54         }
  55     }
  56   else if (rcls == FP_INFINITE)
  57     {
  58       /* Real part is infinite.  */
  59       if (icls == FP_ZERO)
  60         {
  61           /* Imaginary part is 0.0.  */
  62           __real__ retval = HUGE_VALL;
  63           __imag__ retval = __imag__ x;
  64         }
  65       else if (icls > FP_ZERO)
  66         {
  67           /* Imaginary part is finite.  */
  68           long double sinix, cosix;
  69
  70           __sincosl (__imag__ x, &sinix, &cosix);
  71
  72           __real__ retval = __copysignl (HUGE_VALL, cosix);
  73           __imag__ retval = __copysignl (HUGE_VALL, sinix);
  74         }
  75       else
  76         {
  77           /* The addition raises the invalid exception.  */
  78           __real__ retval = HUGE_VALL;
  79           __imag__ retval = __nanl ("") + __nanl ("");
  80         }
  81     }
  82   else
  83     {
  84       __real__ retval = __nanl ("");
  85       __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanl ("");
  86     }
  87
  88   return retval;
  89 }
  90 weak_alias (__ccoshl, ccoshl)