The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
And this can spill over beyond the venue itself.
，详情可参考Safew下载
The tradeoff is complexity. The microcode must be carefully arranged so that the instructions in delay slots are either useful setup for both paths, or at least harmless if the redirect fires. Not every case is as clean as RETF. When a PLA redirect interrupts an LCALL, the return address is already pushed onto the microcode call stack (yes, the 386 has a microcode call stack) -- the redirected code must account for this stale entry. When multiple protection tests overlap, or when a redirect fires during a delay slot of another jump, the control flow becomes hard to reason about. During the FPGA core implementation, protection delay slot interactions were consistently the most difficult bugs to track down.
大年初五，我去城北找小时候常吃的煎粉摊。印象里，春节期间那里总是堵得厉害，十字路口的人行天桥挤满人，走上去甚至会有一点轻微晃动。可那天到了一看，街上却空了许多。以前常逛的品牌服装店换了门头，成了红底白字的“工厂直供店”，临街最显眼的还是老凤祥、中国黄金，循环播放着春节里特有的热闹音乐。
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