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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The Doncaster-born singer won for his live rendition of Black Sabbath's Changes, recorded during Ozzy Osbourne's farewell concert in Birmingham last year.
无独有偶！我的一位媒体朋友、作家褚朝新，也收到了秭归果农的恳求，年富力强的他，毫不犹豫地从湖南长沙，踏上了赴湖北秭归的征程。