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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"He is the prime minister. He has two working parents with education and access to all the information in the world and nothing that untoward might happen to his individual children. That's not the experience of children at large."