tltao wrote:

> I'm not sure I follow what you mean here; does this mean that if you have a 
> register asm variable, it might not end up in that register? That seems like 
> a regression for existing code.

Ah, good point. I was thinking more in line of mismatching register classes, 
but you're right, with our current TargetLowering logic, it's not possible to 
combine register asm with any other constraints.

https://github.com/llvm/llvm-project/pull/85846
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