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热词
    • 3. 发明授权
    • Prefetch buffer and information processing system using the same
    • 预取缓冲区和信息处理系统使用相同
    • US5345560A
    • 1994-09-06
    • US921742
    • 1992-07-30
    • Shuuichi MiuraKenichi KurosawaTetsuaki NakamikawaKenji Hirose
    • Shuuichi MiuraKenichi KurosawaTetsuaki NakamikawaKenji Hirose
    • G06F9/38G06F12/02G06F12/08
    • G06F12/0862G06F12/0811G06F2212/6022G06F2212/6026
    • A prefetch buffer adapted to be installed between a cache memory and a main memory in a computer system having a CPU. The prefetch buffer includes a buffer storage having at least one entry for storing prefetched data and an address tag, which is to be used for searching the data, as a pair; a data searcher for searching, from the data stored in the buffer storage, for data having an address requested by the CPU; and an address estimator for determining an address of data to be prefetched next from the main memory, based on the address requested by the CPU and also on a history of the addresses of data prefetched in the past from the main memory; and an address generator for generating an address of data to be prefetched from the main memory. With this arrangement, it is possible to improve the hit ratio of the prefetch buffer regardless of the direction in which the access address varies.
    • 一种适于安装在具有CPU的计算机系统中的高速缓冲存储器和主存储器之间的预取缓冲器。 预取缓冲器包括具有用于存储预取数据的至少一个条目和要用于搜索数据的地址标签作为一对的缓冲存储器; 数据搜索器,用于从存储在缓冲存储器中的数据中搜索具有由CPU请求的地址的数据; 以及地址估计器,用于基于所述CPU所请求的地址以及来自主存储器的过去预取的数据的地址的历史来确定要从主存储器预先预取的数据的地址; 以及地址发生器,用于从主存储器生成要预取的数据的地址。 利用这种布置,无论访问地址变化的方向如何,都可以提高预取缓冲器的命中率。