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glibc  2.9
Functions
s_ccosh.c File Reference
#include <complex.h>
#include <fenv.h>
#include <math.h>
#include "math_private.h"
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Functions

__complex__ double __ccosh (__complex__ double x)

Function Documentation

__complex__ double __ccosh ( __complex__ double  x)

Definition at line 29 of file s_ccosh.c.

{
  __complex__ double retval;
  int rcls = fpclassify (__real__ x);
  int icls = fpclassify (__imag__ x);

  if (rcls >= FP_ZERO)
    {
      /* Real part is finite.  */
      if (icls >= FP_ZERO)
       {
         /* Imaginary part is finite.  */
         double sinh_val = __ieee754_sinh (__real__ x);
         double cosh_val = __ieee754_cosh (__real__ x);
         double sinix, cosix;

         __sincos (__imag__ x, &sinix, &cosix);

         __real__ retval = cosh_val * cosix;
         __imag__ retval = sinh_val * sinix;
       }
      else
       {
         __imag__ retval = __real__ x == 0.0 ? 0.0 : __nan ("");
         __real__ retval = __nan ("") + __nan ("");

#ifdef FE_INVALID
         if (icls == FP_INFINITE)
           feraiseexcept (FE_INVALID);
#endif
       }
    }
  else if (rcls == FP_INFINITE)
    {
      /* Real part is infinite.  */
      if (icls == FP_ZERO)
       {
         /* Imaginary part is 0.0.  */
         __real__ retval = HUGE_VAL;
         __imag__ retval = __imag__ x * __copysign (1.0, __real__ x);
       }
      else if (icls > FP_ZERO)
       {
         /* Imaginary part is finite.  */
         double sinix, cosix;

         __sincos (__imag__ x, &sinix, &cosix);

         __real__ retval = __copysign (HUGE_VAL, cosix);
         __imag__ retval = (__copysign (HUGE_VAL, sinix)
                          * __copysign (1.0, __real__ x));
       }
      else
       {
         /* The addition raises the invalid exception.  */
         __real__ retval = HUGE_VAL;
         __imag__ retval = __nan ("") + __nan ("");

#ifdef FE_INVALID
         if (icls == FP_INFINITE)
           feraiseexcept (FE_INVALID);
#endif
       }
    }
  else
    {
      __real__ retval = __nan ("");
      __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nan ("");
    }

  return retval;
}

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