🌏 Part 4. 落地场景延伸：从 Tool 到 Partner
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6. Regulatory concerns，更多细节参见谷歌浏览器【最新下载地址】
The TLB lookup is combinational -- it evaluates in the same half-cycle as the limit check, requiring no additional clock. The common case (TLB hit, no page boundary crossing) adds zero overhead to a memory access. This is why the Segment Descriptor Cache and Page Cache (TLB) together occupy such substantial die area -- they are the fast path that makes protected mode competitive with real mode.