The 3-delay-slot scheme works when there is useful work to fill those three cycles. But some instructions genuinely need the protection result before they can proceed. LAR (Load Access Rights) and VERR (Verify Read), for example, exist solely to query protection status -- there is no useful setup to overlap with.
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。关于这个话题，safew官方版本下载提供了深入分析
On the third loop iteration, the backing store of size 2 is
branches reported their transactions to "regional centers" for reconciliation