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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，这一点在heLLoword翻译官方下载中也有详细论述
res[i] = stack.length ? stack.at(-1) - i : 0;，更多细节参见旺商聊官方下载
This bond can seem like love, she says, and leads to people magnetically drawn into unhealthy dynamics because they are familiar, not because they are the perfect match.，更多细节参见同城约会
Starring: Carmen Maura and Daniel Hendler