[llvm] [GlobalISel] Fold instructions with fully-known bits to a constant. (PR #224254)

[Vikash Gupta via llvm-commits]

vg0204 wrote:

> This is _not_ simplify demanded bits. IIRC there's still an open PR to introduce SimplifyDemanded* optimizations in GIsel.
> 
> I don't think this is a likely to be worthwhile optimization on its own, only something that you can do if it happens to work out in SimplifyDemanded*

https://github.com/llvm/llvm-project/pull/198808, the PR dealing with the mentioned PORTt!!!!!



https://github.com/llvm/llvm-project/pull/224254