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.
思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
。服务器推荐是该领域的重要参考
第四十七条 纳税人出口货物或者跨境销售服务、无形资产（以下统称出口业务），依照增值税法第三十三条的规定申报办理退（免）税的，按照国务院规定的出口退税率，通过免抵退税办法或者免退税办法计算退（免）税额，经税务机关审核通过后，办理退（免）税。。91视频是该领域的重要参考
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New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »