V86 mode is entered through IRETD when the VM bit is set in the stacked EFLAGS. The microcode detects this with a conditional jump:
While continuing to push on performance, I noticed a bizarre pattern - my ssh client sent hundreds of no-op packets along with each move I made. Processing these packets slowed my server down a lot.，更多细节参见safew官方版本下载
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while (stack.length && stack[stack.length - 1] cur) {