Prefetching to retrieve content from a memory system

A method comprising:

• retrieving content from a memory system;
• storing a plurality of entries in history storage circuitry, each of the plurality of entries identifying a basic block of memory addresses, wherein the basic block of memory addresses is a contiguous range of memory addresses from which content has been requested to be retrieved from the memory system, wherein the plurality of entries has an entry order corresponding to a basic block order in which corresponding basic blocks have been requested to be retrieved from the memory system;
• associating an entry-order-older basic block with an entry-order-younger basic block for which respective entries are stored in the history storage circuitry, wherein the entry-order-older basic block and the entry-order-younger basic block are separated by at least a defined minimum number of entries in entry order in the history storage circuitry;
• monitoring a sequence of request addresses from which content is requested to be retrieved from the memory system;
• and
• in response to a requested address in the sequence of request addresses corresponding to the entry-order-older basic block to causing the retrieval of content from the memory system corresponding to the entry-order-younger basic block.

A non-transitory computer-readable medium storing computer-readable code for fabrication of an apparatus comprising:

• prefetch circuitry configured to retrieve content from a memory system;
• history storage circuitry configured to store a plurality of entries, each of the plurality of entries identifying a basic block of memory addresses, wherein the basic block of memory addresses is a contiguous range of memory addresses from which content has been requested to be retrieved from the memory system, wherein the plurality of entries has an entry order corresponding to a basic block order in which corresponding basic blocks have been requested to be retrieved from the memory system;
• and
• control circuitry configured to:
• associate an entry-order-older basic block with an entry-order-younger basic block for which respective entries are stored in the history storage circuitry, wherein the entry-order-older basic block and the entry-order-younger basic block are separated by at least a defined minimum number of entries in entry order in the history storage circuitry,
• monitor a sequence of request addresses from which content is requested to be retrieved from the memory system,
• and in response to a requested address in the sequence of request addresses corresponding to the entry-order-older basic block to cause the prefetch circuitry to retrieve content from the memory system corresponding to the entry-order-younger basic block.