sysdeps/libm-ieee754/s_csinhl.c

   1 /* Complex sine 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 __csinhl (__complex__ long double x)
  29 {
  30   __complex__ long double retval;
  31   int negate = signbit (__real__ x);
  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 = sinh_val * cosix;
  50           __imag__ retval = cosh_val * sinix;
  51
  52           if (negate)
  53             __real__ retval = -__real__ retval;
  54         }
  55       else
  56         {
  57           if (rcls == FP_ZERO)
  58             {
  59               /* Real part is 0.0.  */
  60               __real__ retval = __copysignl (0.0, negate ? -1.0 : 1.0);
  61               __imag__ retval = __nanl ("") + __nanl ("");
  62
  63 #ifdef FE_INVALID
  64               if (icls == FP_INFINITE)
  65                 feraiseexcept (FE_INVALID);
  66 #endif
  67             }
  68           else
  69             {
  70               __real__ retval = __nanl ("");
  71               __imag__ retval = __nanl ("");
  72
  73 #ifdef FE_INVALID
  74               feraiseexcept (FE_INVALID);
  75 #endif
  76             }
  77         }
  78     }
  79   else if (rcls == FP_INFINITE)
  80     {
  81       /* Real part is infinite.  */
  82       if (icls == FP_ZERO)
  83         {
  84           /* Imaginary part is 0.0.  */
  85           __real__ retval = negate ? -HUGE_VALL : HUGE_VALL;
  86           __imag__ retval = __imag__ x;
  87         }
  88       else if (icls > FP_ZERO)
  89         {
  90           /* Imaginary part is finite.  */
  91           long double sinix, cosix;
  92
  93           __sincosl (__imag__ x, &sinix, &cosix);
  94
  95           __real__ retval = __copysignl (HUGE_VALL, cosix);
  96           __imag__ retval = __copysignl (HUGE_VALL, sinix);
  97
  98           if (negate)
  99             __real__ retval = -__real__ retval;
 100         }
 101       else
 102         {
 103           /* The addition raises the invalid exception.  */
 104           __real__ retval = HUGE_VALL;
 105           __imag__ retval = __nanl ("") + __nanl ("");
 106
 107 #ifdef FE_INVALID
 108           if (icls == FP_INFINITE)
 109             feraiseexcept (FE_INVALID);
 110 #endif
 111         }
 112     }
 113   else
 114     {
 115       __real__ retval = __nanl ("");
 116       __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanl ("");
 117     }
 118
 119   return retval;
 120 }
 121 weak_alias (__csinhl, csinhl)