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 <fenv.h>
  23 #include <math.h>
  24
  25 #include "math_private.h"
  26
  27
  28 __complex__ long double
  29 __ccoshl (__complex__ long double x)
  30 {
  31   __complex__ long double retval;
  32   int rcls = fpclassify (__real__ x);
  33   int icls = fpclassify (__imag__ x);
  34
  35   __real__ x = fabsl (__real__ x);
  36
  37   if (rcls >= FP_ZERO)
  38     {
  39       /* Real part is finite.  */
  40       if (icls >= FP_ZERO)
  41         {
  42           /* Imaginary part is finite.  */
  43           long double sinh_val = __ieee754_sinhl (__real__ x);
  44           long double cosh_val = __ieee754_coshl (__real__ x);
  45           long double sinix, cosix;
  46
  47           __sincosl (__imag__ x, &sinix, &cosix);
  48
  49           __real__ retval = cosh_val * cosix;
  50           __imag__ retval = sinh_val * sinix;
  51         }
  52       else
  53         {
  54           __imag__ retval = __real__ x == 0.0 ? 0.0 : __nanl ("");
  55           __real__ retval = __nanl ("") + __nanl ("");
  56
  57 #ifdef FE_INVALID
  58           if (icls == FP_INFINITE)
  59             feraiseexcept (FE_INVALID);
  60 #endif
  61         }
  62     }
  63   else if (rcls == FP_INFINITE)
  64     {
  65       /* Real part is infinite.  */
  66       if (icls == FP_ZERO)
  67         {
  68           /* Imaginary part is 0.0.  */
  69           __real__ retval = HUGE_VALL;
  70           __imag__ retval = __imag__ x;
  71         }
  72       else if (icls > FP_ZERO)
  73         {
  74           /* Imaginary part is finite.  */
  75           long double sinix, cosix;
  76
  77           __sincosl (__imag__ x, &sinix, &cosix);
  78
  79           __real__ retval = __copysignl (HUGE_VALL, cosix);
  80           __imag__ retval = __copysignl (HUGE_VALL, sinix);
  81         }
  82       else
  83         {
  84           /* The addition raises the invalid exception.  */
  85           __real__ retval = HUGE_VALL;
  86           __imag__ retval = __nanl ("") + __nanl ("");
  87
  88 #ifdef FE_INVALID
  89           if (icls == FP_INFINITE)
  90             feraiseexcept (FE_INVALID);
  91 #endif
  92         }
  93     }
  94   else
  95     {
  96       __real__ retval = __nanl ("");
  97       __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanl ("");
  98     }
  99
 100   return retval;
 101 }
 102 weak_alias (__ccoshl, ccoshl)