A device to give Gosling nightmares!

Making up for the long delay between my last two posts, here's another one mere hours after the last, and this time with code!
:D So, I've been reading about Duff's device and loop unrolling, and wanted to have a crack at it in Java... well of course there is absolutely no point implementing this in Java, and the results are just as I expected... the JVM can optimize a normal loop better than it can an unrolled loop :p ... I've even heard that every time a developer unwinds a loop in Java, James Gosling gets a headache... sorry James.

Still it was a good interesting exercise... I challenge you all to implement an unrolled loop in your language of choice! I'd love to see a lisp version, actually on second thoughts...

Anyhow, here it is:

//(c)me & GPL3:
public class DuffsDevice
{
  public static void main(String[] args)
  {
    int demoSize = 80;//woot... 0 works
    System.out.println("Normal loop: "  );
    long start = System.nanoTime();
    for(int i = 0; i < demoSize; i++)// one partial two full for demo
    {
      System.out.print(" Bit:" + i);
    }//normal loop
    System.out.println("\nNormal  end: " + (System.nanoTime()-start));

    final int winding = 5;//up to 6
    System.out.println("Duffs device in Java loop: ");
    start = System.nanoTime();
    for(int i = 0; i < demoSize; i = i)// one partial two full for demo
    {
      System.out.print("\n" );//System.out.println("size%winding:" + demoSize%winding + "  i:" + i  );
      switch( (i + winding <= demoSize) ? 0 : winding-(demoSize%winding) )
      {
        //case (winding-6): { System.out.print(" Bit:" + (i) +" -a" ); i++; }
        case (winding-5): { System.out.print(" Bit:" + (i) +" -b" ); i++; }
        case (winding-4): { System.out.print(" Bit:" + (i) +" -c" ); i++; }
        case (winding-3): { System.out.print(" Bit:" + (i) +" -d" ); i++; }
        case (winding-2): { System.out.print(" Bit:" + (i) +" -e" ); i++; }
        case (winding-1): { System.out.print(" Bit:" + (i) +" -f" ); i++; }
      }//switch
    }//Duffs device
    System.out.println("\nDuffs device in Java  end: " + (System.nanoTime()-start));
    //usually arround 1803034 in the normal loop
    //usually arround 2272790(winding 3) 2065498(winding 6) for unrolled loop... ymmv of course.
    //Duff was right... this is even pretty ugly in Java :p ... ugly, but fun :D
  }//main
}//class


Hope you enjoyed reading, I especially liked the embedded conditional statement as the switch control statement... writing that bit really got my heart racing haha