NDLI: Branch with masked squashing in superpipelined processors

Content Provider	IEEE Xplore Digital Library
Author	Ching-Long Su Despain, A.M.
Copyright Year	1994
Description	Author affiliation: Adv. Comput. Archit. Lab., Univ. of Southern California, Los Angeles, CA, USA (Ching-Long Su)
Abstract	The performance of a superpipeline processor heavily relies on its branch performance. Traditional branch strategies used in pipelined processors are delayed branches and branch with squashing. Delayed branches use safe instructions to fill delay slots. However, for a deeply pipelined processor, a compiler may not be able to find sufficient safe instructions to fill the branch delay slots. Branch with squashing takes advantage of using instructions in target basic blocks to fill the branch delay slots. However, the penalty of branch misprediction is large in superpipelined processors. The authors propose a novel branch scheme, named branch with masked squashing, which takes advantage of both delayed branch and branch with squashing. The basic idea is to fill delay slots with safe instructions which may come from above or after the branch. For the remaining unfilled delay slots, the authors fill with instructions from the predicted target path. In the case of misprediction, only unsafe instructions are annulled. The safe instructions in branch delay slots are always executed. Simulation results show that this branch strategy performs better than traditional delayed branch and branch with squashing.<>
Starting Page	130
Ending Page	140
File Size	1190975
Page Count	11
File Format	PDF
ISBN	0818655100
DOI	10.1109/ISCA.1994.288155
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-04-18
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Pipelines Simultaneous localization and mapping Analytical models Computer architecture Laboratories Throughput Compaction CMOS technology CMOS process
Content Type	Text
Resource Type	Article

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