摘要： 高速缓冲存储器(Cache)作为微处理器的重要组成部分,在芯片面积和功耗上都占比过高。针对Cache功耗问题,基于分段访问Cache技术和路预测Cache技术,提出一种低功耗组相联Cache的预访问策略。在Cache中增加一个缓冲寄存器(Buffer),用以存储最近Cache命中后被访问的标签和数据子阵列信息。在开始进行标签访问之前,选中该Buffer,并将所访问的Cache标签和Buffer标签进行匹配,根据匹配结果选择采用路预测访问或分段访问方式。通过MiBench基准测试程序并使用SimpleScalar和Sim-Panalyzer进行实验,结果表明,与传统组相联Cache技术相比,该策略能降低25.15%的能量延迟积。

关键词: 低功耗, 高速缓冲存储器, 多路组相联, 路预测, 分阶段, 预访问

Abstract: Cache,as an important part of the microprocessor,accounts for an undueproportion of the chip area and power consumption,which is a problem needs to be solved,especially the intensiveenergy cost.Under the background and based on two kinds of micro structural-level low-power optimization techniques for set-associative Cache——phased Cache,as well as the way-predicting one,this paper proposes a low-power set-associative pre-access Cache strategy.In this strategy,Buffer is added in Cache to store the hit tag and data subarray-information from hit Cache.It selects the buffer before accessing the tag,and then matches the tag from two parts——accessed Cache and Buffer.Referring to the matching result,way-predicting or phased Cache can be chosen to access.Experimental results through MiBench benchmarks,Simple-Scalar and Sim-Panalyzer show that Energy-delay Product(EDP)can be reduced by 25.15% in this strategy.

Key words: low power consumption, Cache, multi-way set-associative, way-predicting, phased, pre-access

中图分类号: 

• TP302