noteMustNotSpill(r);
  final void restrictTo8Bits(OPT_Register r) {    OPT_Register ESP = phys.getESP();            OPT_Register EBP = phys.getEBP();            OPT_Register ESI = phys.getESI();            OPT_Register EDI = phys.getEDI();            addRestriction(r,ESP);    addRestriction(r,EBP);    addRestriction(r,ESI);    addRestriction(r,EDI);  }