if necessary.  */ if (xe == 0)
if necessary. Note: *Our* version of `frexp' sets XE to zero if the argument is Inf or NaN.  This is not portable but faster.  */ if (xe == 0 && fpclassify (x) <= FP_ZERO)
__cbrt (double x){  double xm, ym, u, t2;  int xe;  /* Reduce X.  XM now is an range 1.0 to 0.5.  */  xm = __frexp (fabs (x), &xe);  /* If X is not finite or is null return it (with raising exceptions     if necessary.  */  if (xe == 0)    return x + x; u = (0.354895765043919860      + ((1.50819193781584896	 + ((-2.11499494167371287	    + ((2.44693122563534430	       + ((-1.83469277483613086		  + (0.784932344976639262 - 0.145263899385486377 * xm) * xm)		  * xm))	       * xm))	    * xm))	 * xm));  t2 = u * u * u;  ym = u * (t2 + 2.0 * xm) / (2.0 * t2 + xm) * factor[2 + xe % 3];  return __ldexp (x > 0.0 ? ym : -ym, xe / 3);}