This fails when compiled with javac -O, passes otherwise, on intel only:

public class x {
   final double abs(double d) {
      if (d >= 0.0)
         return d;
      else
         return -d;
   }
   public static void main(String argv[]) {
       int i,j;
       double d1[] = new double[200];
       double d2[] = new double[200];
       x thing = new x();

       d1[3] = -3;
       d2[3] = thing.abs(d1[3]);

       System.out.println("Made it");

   }
}