Intel documentation describes the 386's Protection Test Unit as a component that "implements fast testing of complex memory protection functions." It is mostly composed of a PLA (Programmable Logic Array), referred to as Test PLA by Intel, that is physically visible by its regular appearance on the die. This single piece of combinational logic replaces what would otherwise be dozens of multi-cycle conditional branches in the microcode. Instead of testing privilege rules sequentially, the microcode issues a single protection test operation, and the PLA evaluates all applicable rules in parallel, producing a complete decision in one evaluation: continue, fault, or redirect to a gate handler.
▲METR 此前的研究显示 AI 工具对开发人员生产力的影响,导致生产力下降了 20%;但 METR 表示现在这一发现已经过时,生产力提升似乎更有可能|图片来源:https://x.com/METR_Evals/status/2026355544668385373/
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