sysdeps/libm-ieee754/s_csinhf.c

   1 /* Complex sine hyperbole function for float.
   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__ float
  28 __csinhf (__complex__ float x)
  29 {
  30   __complex__ float retval;
  31   int negate = signbit (__real__ x);
  32   int rcls = fpclassify (__real__ x);
  33   int icls = fpclassify (__imag__ x);
  34
  35   __real__ x = fabsf (__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           float sinh_val = __ieee754_sinhf (__real__ x);
  44           float sinix, cosix;
  45
  46           __sincosf (__imag__ x, &sinix, &cosix);
  47
  48           __real__ retval = sinh_val * cosix;
  49           __imag__ retval = sinh_val * sinix;
  50
  51           if (negate)
  52             __real__ retval = -__real__ retval;
  53         }
  54       else
  55         {
  56           if (rcls == FP_ZERO)
  57             {
  58               /* Real part is 0.0.  */
  59               __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0);
  60               __imag__ retval = __nanf ("") + __nanf ("");
  61             }
  62           else
  63             {
  64               __real__ retval = __nanf ("");
  65               __imag__ retval = __nanf ("");
  66             }
  67         }
  68     }
  69   else if (rcls == FP_INFINITE)
  70     {
  71       /* Real part is infinite.  */
  72       if (icls == FP_ZERO)
  73         {
  74           /* Imaginary part is 0.0.  */
  75           __real__ retval = negate ? -HUGE_VALF : HUGE_VALF;
  76           __imag__ retval = __imag__ x;
  77         }
  78       else if (icls > FP_ZERO)
  79         {
  80           /* Imaginary part is finite.  */
  81           float sinix, cosix;
  82
  83           __sincosf (__imag__ x, &sinix, &cosix);
  84
  85           __real__ retval = __copysignf (HUGE_VALF, cosix);
  86           __imag__ retval = __copysignf (HUGE_VALF, sinix);
  87
  88           if (negate)
  89             __real__ retval = -__real__ retval;
  90         }
  91       else
  92         {
  93           /* The addition raises the invalid exception.  */
  94           __real__ retval = HUGE_VALF;
  95           __imag__ retval = __nanf ("") + __nanf ("");
  96         }
  97     }
  98   else
  99     {
 100       __real__ retval = __nanf ("");
 101       __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanf ("");
 102     }
 103
 104   return retval;
 105 }
 106 weak_alias (__csinhf, csinhf)