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.
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。关于这个话题，Line官方版本下载提供了深入分析
这场新旧交替的博弈，库克没有做选择题，他全都要。
But have no fear; some aspects of the company are doing quite well. Take, for example, nepotism. The future is looking bright indeed for a rising company star who is now co-CEO of Vantage Studios. That title belongs to Charlie Guillemot, the son of Ubisoft CEO Yves Guillemot.