Distributed Reorder Buffer Schemes for Low Power

We consider several approaches for reducing the complexity and power dissipation in processors that use separate register file to maintain the commited register values. The first approach relies on a distributed implementation of the Reorder Buffer (ROB) that spreads the centralized ROB structure across the function units (FUs), with each distributed component sized to match the FU workload and with one write port and two read ports on each component. The second approach combines the use of previously proposed retention latches and a distributed ROB implementation that uses minimally ported distributed components. The second approach avoids any read and write port conflicts on the distributed ROB components (with the exception of possible port conflicts in the course of commitment) and does not incur the associated performance degradation. Our designs are evaluated using the simulation of the SPEC 2000 benchmarks and SPICE simulations of the actual ROB layouts in 0.18 micron process. 1