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.
[1] K. Lemström, J. Tarhio & T. Takala: “Color Dithering with n-Best Algorithm” (1996). ↑
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"The crew's doing great," Steve Stich, manager, Nasa's Commercial Crew Program, said at a news conference.
昨晚，苹果 CEO Tim Cook 在社交媒体官宣：