Cherry: Checkpointed Early Resource Recycling in Out-of-order Microprocessors

This paper presents CHeckpointed Early Resource RecYcling (Cherry), a hybrid mode of execution based on ROB and checkpoint- ing that decouples resource recycling and instruction retirement. Re- sources are recycled early, resulting in a more efcient utilization. Cherry relies on state checkpointing and rollback to service excep- tions for instructions whose r..