math/s_csinhf.c

   1 /* Complex sine hyperbole function for float.
   2    Copyright (C) 1997, 2011 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 Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    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__ float
  29 __csinhf (__complex__ float x)
  30 {
  31   __complex__ float retval;
  32   int negate = signbit (__real__ x);
  33   int rcls = fpclassify (__real__ x);
  34   int icls = fpclassify (__imag__ x);
  35
  36   __real__ x = fabsf (__real__ x);
  37
  38   if (__builtin_expect (rcls >= FP_ZERO, 1))
  39     {
  40       /* Real part is finite.  */
  41       if (__builtin_expect (icls >= FP_ZERO, 1))
  42         {
  43           /* Imaginary part is finite.  */
  44           float sinh_val = __ieee754_sinhf (__real__ x);
  45           float cosh_val = __ieee754_coshf (__real__ x);
  46           float sinix, cosix;
  47
  48           __sincosf (__imag__ x, &sinix, &cosix);
  49
  50           __real__ retval = sinh_val * cosix;
  51           __imag__ retval = cosh_val * sinix;
  52
  53           if (negate)
  54             __real__ retval = -__real__ retval;
  55         }
  56       else
  57         {
  58           if (rcls == FP_ZERO)
  59             {
  60               /* Real part is 0.0.  */
  61               __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0);
  62               __imag__ retval = __nanf ("") + __nanf ("");
  63
  64               if (icls == FP_INFINITE)
  65                 feraiseexcept (FE_INVALID);
  66             }
  67           else
  68             {
  69               __real__ retval = __nanf ("");
  70               __imag__ retval = __nanf ("");
  71
  72               feraiseexcept (FE_INVALID);
  73             }
  74         }
  75     }
  76   else if (__builtin_expect (rcls == FP_INFINITE, 1))
  77     {
  78       /* Real part is infinite.  */
  79       if (__builtin_expect (icls > FP_ZERO, 1))
  80         {
  81           /* Imaginary part is finite.  */
  82           float sinix, cosix;
  83
  84           __sincosf (__imag__ x, &sinix, &cosix);
  85
  86           __real__ retval = __copysignf (HUGE_VALF, cosix);
  87           __imag__ retval = __copysignf (HUGE_VALF, sinix);
  88
  89           if (negate)
  90             __real__ retval = -__real__ retval;
  91         }
  92       else if (icls == FP_ZERO)
  93         {
  94           /* Imaginary part is 0.0.  */
  95           __real__ retval = negate ? -HUGE_VALF : HUGE_VALF;
  96           __imag__ retval = __imag__ x;
  97         }
  98       else
  99         {
 100           /* The addition raises the invalid exception.  */
 101           __real__ retval = HUGE_VALF;
 102           __imag__ retval = __nanf ("") + __nanf ("");
 103
 104 #ifdef FE_INVALID
 105           if (icls == FP_INFINITE)
 106             feraiseexcept (FE_INVALID);
 107 #endif
 108         }
 109     }
 110   else
 111     {
 112       __real__ retval = __nanf ("");
 113       __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanf ("");
 114     }
 115
 116   return retval;
 117 }
 118 #ifndef __csinhf
 119 weak_alias (__csinhf, csinhf)
 120 #endif