frasercrmck added a comment.

In D93298#3014160 <https://reviews.llvm.org/D93298#3014160>, @jrtc27 wrote:

> The amount of duplication here really depresses me and is only going to get 
> worse once codegen is added, but TableGen isn't able to have operands that 
> use different register classes based on even HwMode, that I know of, and 
> whilst you could make use of multi classes to generate both versions of the 
> instructions you can't easily do that for patterns, so I don't know what the 
> right answer is.

Do we know if it's possible to teach TableGen how to do that? This extension 
seems like a good reason to implement such a feature as the duplication really 
is unfortunate.

I thought that `MCOperandInfo` may be an issue but there's already dynamic 
lookup there to support `isLookupPtrRegClass`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D93298/new/

https://reviews.llvm.org/D93298

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