| 摘要 |
In a computer system having a number of page partitioned and virtually addressed address spaces, a physically addressed data storage structure and its complementary selection data storage structure is provided with a complementary memory page crossing prediction storage structure, a latch, and a comparator. The memory page crossing prediction storage structure is used to store a number of memory page crossing predictive annotations corresponding to the contents of the data and selection data storage structures. Each memory page crossing predictive annotation predicts whether the current access crosses into a new memory page. The latch is used to successively record a first portion of each accessing physical address translated from a corresponding portion of each accessing virtual address. The recorded first portion of the physical address of the immediately preceding access is used to select data currently being read out of the storage structures, if the memory page crossing predictive annotation currently being read out predicts no memory page crossing. The comparator is used to determine whether the first portions of the physical addresses of the current and immediately preceding accesses are equal, if the first portion of the physical address of the immediately preceding access is used to select data for the current access. Remedial actions including invalidating the selected data and correcting the incorrect memory page crossing predictive annotation are taken, if the two physical address portions are determined to be unequal. As a result, most of the data retrievals are made without having to wait for the first portions of the accessing physical addresses to be translated, thereby improving the performance of retrieving data from the physically addressed data storage structure. <IMAGE> |
