优点： 输出均值更接近 0，梯度更稳定。
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.
。关于这个话题，safew官方版本下载提供了深入分析
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System descriptor (S=0)