CHECKPOINTING OF SUPERSCALAR OUT-OF-ORDER PROCESSOR FOR ERROR RECOVERY

摘要

PROBLEM TO BE SOLVED: To provide a data processing system having a built-in error recovery from a given check point. SOLUTION: For checkpointing a plurality of instruction in every one cycle, updating of designated maximum register contents executed by a plurality of CISC/RISC instructions is collected in a buffer (CSB) 60 for a check point condition, whereby the check point condition includes buffer slots of the same number as that of registers to be updated by the plurality of CISC instructions, and an item of a program counter value related to the youngest external instruction of the plurality of CISC instructions. After it is determined that no error is detected in the register data, before the completion of the youngest external instruction of the plurality of external instructions or at the completion thereof, the already architected register array (ARA) 64 is updated by newly collected register data.