The debug information for doubles on the expression stack is incorrect on Sparc for C1. In 1.4.1 the ordering of the two halves of a double was swapped in the RInfo but the debug information generation code in LIREmitter wasn't updated. Here's a test case provided by Vladimir Kozlov.

public class Testf {
  static final double value = 10000000.;

  private static void check( double l ) {
    if ( l != value )
      System.out.println("l("+l+") != Value("+value+")");
  }

  private static double foo( ) {
    double l = 0.;
    while(l < value) {
      l += 1.; // deoptimization happens here and the double 'l' value is
    } // stored to interpreter stack incorrectly on Sparc-v8plus
    return l;
  }

  public static void main(String arg[]) {
    System.out.println("Start!");
    for(int i=0; i < 100; i++) {
      System.out.println(i);
      System.gc();
      check( foo( ) );
    }
    System.out.println("Done!");
  }
}




This needs to be run with -XX:+DeoptimizeALot
###@###.### 2003-05-06