if (loc != null) loc.instruction = null; if (guard != null) guard.instruction = null; if (base != null) base.instruction = null; if (index != null) index.instruction = null;
  OPT_MemoryOperand(OPT_RegisterOperand base, 		    OPT_RegisterOperand index,		    byte scale,		    int disp,		    byte size,		    OPT_LocationOperand loc,		    OPT_Operand guard) {    this.loc = loc;    this.guard = guard;    this.base = base;    this.index = index;    this.scale = scale;    this.disp = disp;    this.size = size;  }