Fetching a cache line before a demand access requires it, to overlap transfer latency with useful work. A software prefetch is one way to request this; unnecessary requests can cause cache pollution.
A program-directed hint to fetch a cache line early. A useful nonblocking hint produces no destination processor register value and allows execution to continue before the transfer completes. Fault and dropping behavior depend on the specified instruction contract.

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  1. Cache hierarchy
  2. Cache (computing)
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