Fast InvSqrt in Max

This seems slightly faster:

Function InvSqrtFast:Float(x:Float)

	Local i:Int = $5f3759df - (Int Ptr(Varptr(x))[0] Shr 1)
	Return  (Float Ptr(Varptr(i))[0]) *(1.5 - ((0.5*x)*(Float Ptr(Varptr(i))[0])*(Float Ptr(Varptr(i))[0])))
	
End Function