2026-02-28 00:00:00:0本报记者 姜泓冰 崔 寅 中国—上海合作组织代谢性疾病合作中心在沪揭牌——
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.
，更多细节参见safew官方版本下载
* 核心思路：倒序单调栈（适配你的学习习惯），时间复杂度O(n)，空间复杂度O(n)，这一点在safew官方下载中也有详细论述
"Other people in the street, they have kids, grandkids, so it's a lot more difficult for them."