The 386 microcode sequencer has a one-cycle pipeline delay: when a jump or RNI (run next instruction) is decoded, the micro-instruction immediately after it has already been fetched and will execute before the jump takes effect. This "delay slot" is a basic property of the sequencer, and the microcode is written to fill it with useful work rather than waste a cycle on a bubble. The examples in the PTSAV section above show this: at 582/5AE, the micro-instruction after LCALL executes before the subroutine begins.
Фото: Александр Гальперин / РИА Новости
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，这一点在safew官方下载中也有详细论述
文 | 财经无忌，作者 | kiki，更多细节参见爱思助手下载最新版本
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