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.
As proposed, a runtime evaluator will need to be “best effort”,
。关于这个话题，夫子提供了深入分析
3014272410http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142724.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142724.html11921 河北在推进京津冀协同发展中彰显新担当
习近平同志真的不着急“点火”。他坚持以调研开路，马不停蹄地下基层，访农家、上海岛、进企业。最终，在履职浙江的第十个月，习近平同志正式亮出他的“顶层设计”——“八八战略”。