APPARATUS AND METHOD FOR CONSOLIDATING MEMORY ACCESS PREDICTION INFORMATION TO PREFETCH CACHE MEMORY DATA

摘要

An apparatus is connected to a main memory, includes a cache memory holding data and a memory storing prediction information in plural areas thereof. The prediction information is referenced to determine whether to execute prefetch, which holds data from the main memory to the cache memory, in a case where a plurality of unrolled instructions produced by unrolling a target instruction included in a loop sentence are executed individually, and corresponds to individual memory accesses executed at certain address intervals in accordance with the respective unrolled instructions. The apparatus executes memory access to the main memory, and executes the prefetch. When the plurality of unrolled instructions are executed individually, the apparatus consolidates a plurality of pieces of prediction information respectively stored in the plural areas of the memory into one based on the number-of-unrolling information, and stores the consolidated prediction information into any one of the plural areas.