LLVM Clang 12 Merges Support For x86_64 Microarchitecture Levels

[mlau]

Taking product segmentation to the ISA-level would bite them hard and its customers who bought these chips. But I'd argue rightfully so as it was silly to begin with and when the customers were ignorant of this fact, they need to live with the consequences (as there were options on the market which offered these instructions in the low end).

Intel wouldn't care about customers, they'd have a ton of worthless inventory because it couldn't run newest windows any more. But I'm certain that MS wouldn't do that
either, because of the support nightmare caused by Intels ISA segmentation, and there are still surprisingly many people running sandybridge/early bulldozer era machines.