文 | 螺旋实验室，作者丨追命，编辑丨坚果
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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.，这一点在heLLoword翻译官方下载中也有详细论述
The government has pledged to halve "long-term rough sleeping" by 2030 and prevent more households from becoming homeless in the first place.，推荐阅读旺商聊官方下载获取更多信息