Three microcode cycles for the writeback alone. That's acceptable because segment loads are already expensive multi-cycle operations, and the designers likely expected them to be infrequent -- most programs load their segments once at startup and never touch them again. Page translations happen on every memory access, so the same approach would be ruinous. Hence the fully autonomous hardware walker.
「我未曾深入研究，也不認為這是我的職責範圍。」
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Hinkley Point C
当越来越多「Agent」能够被像软件一样使用，AI 对工作方式的影响，才会真正开始外溢。
In microcode, the privilege check reduces to a single conditional jump: