Pattern match prefetcher with supplemental program-counter-based learning

Abstract

Disclosed techniques relate to supplemental PC-based learning for a pattern-based prefetcher. In some embodiments, prefetch circuitry is configured to store access map data based on address information corresponding to memory accesses and generate, based on the access map data and stored access patterns, one or more prefetch requests to prefetch data to a cache. In some embodiments, supplemental access tracking circuitry is configured to store initial access tracking information for offsets corresponding to a first access map evicted from the prefetch circuitry, store program counter information associated with an initial memory access that touched the first access map, update the access tracking information, based on one or more additional access maps evicted from the prefetch circuitry that match the stored program counter information, and generate, in response to a hit and based on the updated access tracking information, a starting access map for allocation in the prefetch circuitry.