The V86 return path is one of the longest microcode sequences in the 386. It pops nine DWORDs from the stack -- EIP, CS, EFLAGS, ESP, SS, ES, DS, FS, GS -- compared to three for a normal IRET. The microcode then sets up fixed access rights for every segment register:
Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
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One 2025 estimate is that food crime costs the global economy around £81bn ($110bn) a year.
int4 — 最大程度的压缩，文件大小减少约 4 倍。质量损失更明显（约 2~10%，具体取决于模型），但通常可以接受，尤其对于函数调用而言。