This invention describes how to avoid data loss due to limited buffer size during continuous tracing of high frequency events such as branches. The thrust bearing includes a retention hole formed in the support wall, a pressure-receiving piece retained in a recess, and an abrasion-resistant board that is set in between the movable scroll and the pressure-receiving piece and has a sliding surface that comes into sliding contact with the pressure-receiving piece. The system identifies one or more compatible resubstitutions of a selected register, wherein the compatible resubstitution expresses the selected register as one or more pre-existing registers of fixed initial state.