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In this paper, we propose to decouple the recovery mechanism for data speculation from dynamic instruction scheduling structure. Instruction reissue mechanism for data speculation has a serious impact on processor performance. The effective capacity of instruction window is reduced since instructions dependent upon a speculated instruction must remain in instruction window until they are committed. The decoupling of the recovery and scheduling mechanisms solves the problem. A small instruction window schedules instructions and its entry is released immediately when an instruction is dispatched. A large instruction buffer is active only when a misspeculation occurs and is used to reissue instructions dependent upon the misspeculated instruction. Using a cycle-by-cycle simulator, we evaluated the proposal and found that the decoupling is useful.

Decoupling Recovery Mechanism for Data Speculation from Dynamic Instruction Scheduling Structure