METHOD AND SYSTEM FOR EFFICIENTLY UTILIZING RENAME BUFFERS TO REDUCE DISPATCH UNIT STALLS IN A SUPERSCALAR PROCESSOR

摘要

A dispatch stall that includes tracking allocation and deallocation of a real rename buffer for instrucction dispatched by a dispatch unit; Reduction method is disclosed. The method further comprises tagging a rename buffer busy signal to an instruction assigned to at least one virtual rename buffer, wherein the rename buffer busy signal indicates that the instruction And notifies the execution unit that it can not be completed. An efficient system for using a rename buffer in a superscalar processor includes a plurality of rename buffers, a dispatch unit coupled to the plurality of rename buffers, and a processor coupled to the dispatch unit and the plurality of rename buffers. Allocated / deallocated tables. The table also includes a plurality of actual rename buffer slots and at least one virtual rename buffer slot. A rename busy signal is also provided for instructions assigned to the at least one virtual rename buffer slot.