Re-order buffer managing method and processor

Details Re-order buffer managing method and processor Re-order buffer managing method and processor

G - Physics

06

F

G06F 9/38 (2006.01)

Patent

CA 2367324

A managing method for a re-order buffer in an out-of-order execution processor for predicting the flow of a program by branch prediction comprises determining a next executable instruction from an instruction string in the program and speculatively executing the instruction on the basis of a dependence relationship between the prediction and the instruction. The re-order buffer re-writes an execution result according to a program order, and the end of the instruction is notified from function units containing a branch unit and a load unit to the re-order buffer by using an entry number buffer. The load unit manages the latest speculation state of a load instruction based on a branch prediction success/failure signal from the branch unit but does not provide notification to the re-order buffer based on the entry number for subsequent load instructions which the branching prediction has failed, even if processing of the instruction has finished.

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