The answer is essentially hardware-level dependency injection. Before calling LD_DESCRIPTOR, the caller saves its desired test constant into a hardware latch using a micro-op called PTSAV (Protection Save). Within LD_DESCRIPTOR, another micro-op called PTOVRR (Protection Override) retrieves and fires the saved test.
其实消费者的核心诉求只有两条：一是好吃便宜（“好吃”虽无统一标准，但消费者有自己的判断）；二是产品选择多、性价比高、自传播能力强。那些个性鲜明的品牌，之所以能快速崛起，正是因为满足了这些需求。
。heLLoword翻译官方下载对此有专业解读
We wanted a scenario where, say, 5 well-placed border points could efficiently represent an area with 5,000 internal points and 10,000 road edges. This would reduce those 10,000 edges to just 5*4/2 = 10 shortcuts for routing through that cluster at a high level – an incredible 1:1000 point ratio and a 30x reduction in edges to consider for the high-level path!
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