math/s_ccoshf.c

   1 /* Complex cosine 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <complex.h>
  21 #include <fenv.h>
  22 #include <math.h>
  23
  24 #include <math_private.h>
  25
  26
  27 __complex__ float
  28 __ccoshf (__complex__ float x)
  29 {
  30   __complex__ float retval;
  31   int rcls = fpclassify (__real__ x);
  32   int icls = fpclassify (__imag__ x);
  33
  34   if (__builtin_expect (rcls >= FP_ZERO, 1))
  35     {
  36       /* Real part is finite.  */
  37       if (__builtin_expect (icls >= FP_ZERO, 1))
  38         {
  39           /* Imaginary part is finite.  */
  40           float sinh_val = __ieee754_sinhf (__real__ x);
  41           float cosh_val = __ieee754_coshf (__real__ x);
  42           float sinix, cosix;
  43
  44           __sincosf (__imag__ x, &sinix, &cosix);
  45
  46           __real__ retval = cosh_val * cosix;
  47           __imag__ retval = sinh_val * sinix;
  48         }
  49       else
  50         {
  51           __imag__ retval = __real__ x == 0.0 ? 0.0 : __nanf ("");
  52           __real__ retval = __nanf ("");
  53
  54           if (icls == FP_INFINITE)
  55             feraiseexcept (FE_INVALID);
  56         }
  57     }
  58   else if (__builtin_expect (rcls == FP_INFINITE, 1))
  59     {
  60       /* Real part is infinite.  */
  61       if (__builtin_expect (icls > FP_ZERO, 1))
  62         {
  63           /* Imaginary part is finite.  */
  64           float sinix, cosix;
  65
  66           __sincosf (__imag__ x, &sinix, &cosix);
  67
  68           __real__ retval = __copysignf (HUGE_VALF, cosix);
  69           __imag__ retval = (__copysignf (HUGE_VALF, sinix)
  70                              * __copysignf (1.0, __real__ x));
  71         }
  72       else if (icls == FP_ZERO)
  73         {
  74           /* Imaginary part is 0.0.  */
  75           __real__ retval = HUGE_VALF;
  76           __imag__ retval = __imag__ x * __copysignf (1.0, __real__ x);
  77         }
  78       else
  79         {
  80           /* The addition raises the invalid exception.  */
  81           __real__ retval = HUGE_VALF;
  82           __imag__ retval = __nanf ("") + __nanf ("");
  83
  84 #ifdef FE_INVALID
  85           if (icls == FP_INFINITE)
  86             feraiseexcept (FE_INVALID);
  87 #endif
  88         }
  89     }
  90   else
  91     {
  92       __real__ retval = __nanf ("");
  93       __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nanf ("");
  94     }
  95
  96   return retval;
  97 }
  98 #ifndef __ccoshf
  99 weak_alias (__ccoshf, ccoshf)
 100 #endif