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.
A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.
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截至2024年底，中国60周岁及以上人口已突破3.1亿，占总人口比重达22% [37]。进入2026年，这一数字将持续攀升，推动银发经济规模迈向12万亿元人民币的大关 [37]。这一领域不仅是国家政策支持的“国补”重点，更是普通人创业与择业的高确定性赛道 [37, 38]。