A METHOD AND SYSTEM FOR IMPLEMENTING RECOVERY FROM SPECULATIVE FORWARDING MISS PREDICTIONS/ERRORS RESULTING FROM LOAD STORE REORDERING AND OPTIMIZATION

摘要

A method for forwarding data from the store instructions to a corresponding load instruction in an out of order processor. Th e method includes accessing an incoming sequence of instructions; reordering the instructions in accordance with processor resources for dispatch and execution; ensuring a closest earlier store in machine order for to a corresponding load by determining if said store has an actual age but said corresponding load does not have an actual age then said store is earlier than said corresponding load; if said corresponding load has an actual age but said store does not have an actual age then said corresponding load is earlier than said store; if neither said corresponding load or said store have an actual age then a virtual identifier table is used to determine which is earlier; and if both said corresponding load and said store have actual ages then the actual ages are used to determine which is earlier.