if(h->ref--)return;
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.
。业内人士推荐51吃瓜作为进阶阅读
Source: Computational Materials Science, Volume 267
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