The Test PLA extends this idea further. It operates asynchronously with respect to the sequencer. After a protection test fires, the PLA needs time to evaluate and produce its redirect address. Instead of stalling, the 386 allows the next three micro-instructions to execute before the redirect takes effect -- and the microcode is carefully written to use these delay slots productively. This is tremendously confusing when reading the microcode for the first time (huge credit to the disassembly work by reenigne). But Intel did it for performance.
We did of course have a countdown first, because people love countdowns, because cricket is basically one unceasing countdown, an endless pencil stub ticking off names and numbers. There were 99 members of the supporting cast to be ushered to their spots, the non-Shanes of history, meat in the Ashes room.
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// 易错点2：判断条件必须是<=，而非<（相等元素也无法作为「更大值」，需弹出）