private RegisterStorage CrFromOperand(ConditionOperand ccOp)
 {
     return arch.CrRegisters[(int)ccOp.condition >> 2];
 }
 private ConditionCode CcFromOperand(ConditionOperand ccOp)
 {
     switch (ccOp.condition & 3)
     {
     case 0: return ConditionCode.LT;
     case 1: return ConditionCode.GT;
     case 2: return ConditionCode.EQ;
     case 3: return ConditionCode.OV;
     default: throw new NotImplementedException();
     }
 }