Reverse engineering the 386 processor's prefetch queue circuitry

· Ken Shirriff · May 10, 2025, 4:01 p.m.
Summary
This blog post delves into the intricate details of the 386 processor's prefetch queue circuitry, discussing its design, function, and the technologies employed to enhance performance. It explains how the prefetch unit works to retrieve instructions ahead of their execution and elaborates on the complexities involved in the incrementer, alignment network, and sign extension processes. Despite the lack of groundbreaking discoveries, the content provides valuable insights into low-level processor design and could interest those keen on computer architecture.
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