for (Enumeration e = bb.forwardRealInstrEnumerator();
if (bb == null) return false; for (Enumeration e = bb.forwardRealInstrEnumerator();
  private boolean hasLongDef(OPT_BasicBlock bb) {    for (Enumeration e = bb.forwardRealInstrEnumerator();         e.hasMoreElements(); ) {      OPT_Instruction s = (OPT_Instruction)e.nextElement();      for (Enumeration d = s.getDefs(); d.hasMoreElements(); ) {        OPT_Operand def = (OPT_Operand)d.nextElement();        if (def.isRegister()) {          if (def.asRegister().register.isLong()) return true;        }      }    }    return false;  }