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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第四十二条 县级以上人民政府部门对本部门所属机构、派出机构行政执法工作的监督检查，实行垂直管理的部门或者实行双重领导并且以上级部门领导为主的部门对所属机构、下级部门行政执法工作的监督检查，参照本条例有关规定执行。