Improving Dynamic Cluster Assignment for Clustered Trace Cache Processors

This work examines dynamic cluster assignment for a clustered trace cache processor (CTCP). Previously proposed cluster assignment techniques run into unique problems as issue width and cluster count increase. Realistic design conditions, such as variable data forwarding latencies between clusters and a heavily partitioned instruction window, increase the degree of difficulty for effective cluster assignment. In this work, the trace cache and fill unit are used to perform dynamic cluster assignment. The retire-time fill unit analysis is aided by a dynamic profiling mechanism embedded within the trace cache. This mechanism provides information about inter-trace data dependencies, an element absent in previous retire-time CTCP cluster assignment work. The strategy proposed in this work leads to more intra-cluster data forwarding and shorter data forwarding distances. In addition, performing cluster assignment at retire time reduces issue-time complexity and eliminates early pipeline...

• Type: Conference
• Year: 2003
• Where: ISCA
• Authors: Ravi Bhargava, Lizy Kurian John
• Keywords: Cluster Assignment, Dynamic Cluster Assignment, Hardware, ISCA 2003, Trace Cache