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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.，这一点在Line官方版本下载中也有详细论述
结论：在不确定性中构建非对称优势，详情可参考WPS官方版本下载
设备价格下降，是这门生意能够成立的前提。租金区间从早期的“几万一天”回落到几千元一天，使得更多活动方能够接受成本。这种价格带变化，为市场规模打开了空间。