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

__complex__ double __cexp (__complex__ double x)

Function Documentation

__complex__ double __cexp ( __complex__ double  x)

Definition at line 29 of file s_cexp.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 exp_val = __ieee754_exp (__real__ x);
         double sinix, cosix;

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

         if (isfinite (exp_val))
           {
             __real__ retval = exp_val * cosix;
             __imag__ retval = exp_val * sinix;
           }
         else
           {
             __real__ retval = __copysign (exp_val, cosix);
             __imag__ retval = __copysign (exp_val, sinix);
           }
       }
      else
       {
         /* If the imaginary part is +-inf or NaN and the real part
            is not +-inf the result is NaN + iNaN.  */
         __real__ retval = __nan ("");
         __imag__ retval = __nan ("");

#ifdef FE_INVALID
         feraiseexcept (FE_INVALID);
#endif
       }
    }
  else if (rcls == FP_INFINITE)
    {
      /* Real part is infinite.  */
      if (icls >= FP_ZERO)
       {
         /* Imaginary part is finite.  */
         double value = signbit (__real__ x) ? 0.0 : HUGE_VAL;

         if (icls == FP_ZERO)
           {
             /* Imaginary part is 0.0.  */
             __real__ retval = value;
             __imag__ retval = __imag__ x;
           }
         else
           {
             double sinix, cosix;

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

             __real__ retval = __copysign (value, cosix);
             __imag__ retval = __copysign (value, sinix);
           }
       }
      else if (signbit (__real__ x) == 0)
       {
         __real__ retval = HUGE_VAL;
         __imag__ retval = __nan ("");

#ifdef FE_INVALID
         if (icls == FP_INFINITE)
           feraiseexcept (FE_INVALID);
#endif
       }
      else
       {
         __real__ retval = 0.0;
         __imag__ retval = __copysign (0.0, __imag__ x);
       }
    }
  else
    {
      /* If the real part is NaN the result is NaN + iNaN.  */
      __real__ retval = __nan ("");
      __imag__ retval = __nan ("");

#ifdef FE_INVALID
      if (rcls != FP_NAN || icls != FP_NAN)
       feraiseexcept (FE_INVALID);
#endif
    }

  return retval;
}

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