Browsing by Author "Chi, SA"

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Instruction cache prefetching directed by branch prediction
(1999-09-01)
Chiu, JC
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Shiu, RM
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Chi, SA
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Chung, CP
;
資訊科學與工程研究所
As the gap between processor speed and memory speed grow, so the performance penalty of instruction cache misses gets higher. Instruction cache prefetching is a technique to reduce this penalty. The prefetching methods determine the target line to be prefetched generally based on the current fetched line address. However, as the cache line becomes wider, it may contain multiple branches. This is a hurdle which must be overcome. The authors have developed a new instruction cache prefetching method in which the prefetch is directed by the prediction on branches, called branch instruction based (BIB) prefetching; in which the prefetch information is recorded in an extended BTB. Simulation results show that for commercial benchmarks, BIB prefetching outperforms traditional sequential prefetching by 7% and other prediction table based prefetching methods by 17% on average. As BTB designs become more sophisticated and achieve higher hit and accuracy ratios, BIB prefetching can achieve a higher level of performance.
Instruction cache prefetching with extended BTB
(1997)
Chi, SA
;
Shiu, RM
;
Chiu, JC
;
Chang, SE
;
Chung, CP
Instruction cache prefetching is a technique to reduce the penalty caused by instruction cache misses. The prefetching methods generally determines the target fine to be prefetched based on the current fetched fine address. However, as the cache fine becomes wider, there may be multiple branches in a cache fine which hurdles the decision made by these methods. This paper develops a new instruction cache prefetching method in which the prefetch is directed by the prediction on branches. We call it the branch instruction based (BIB) prefetching, In BIB prefetching, the prefetch information is recorded in an extended BTB. Simulation results show that, the BIB prefetching outperforms the traditional sequential prefetching by 7% and other prediction table based prefetching methods by 17% on average, iis the BTB designs become more sophisticated and achieve higher hit and accuracy ratio the BIB prefetching can achieve higher performance.