Turbo-ROB: A Low Cost Checkpoint/Restore Accelerator
Modern processors use speculative execution to improve performance. However, speculative execution requires a checkpoint/restore mechanism to repair the machine's state whenever speculation fails. Existing checkpoint/restore mechanisms do not scale well for processors with relatively large windows (i.e., 128 or more). This paper presents turbo-ROB, a checkpoint/restore recovery accelerator that can complement or replace existing checkpoint/restore mechanisms. The authors show that the turbo-ROB improves performance and reduces resource requirements compared to a conventional re-order buffer mechanism.