[llvm] [LV] Peek through bitcasts when performing CSE (PR #146856)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> I'm not really sure about the consequences of the legacy CSE to VPlan-based CSE refactoring. I think @artagnon is more knowledgeable on that matter.

I think @fhahn is right, and it might be very difficult (or impossible) to get this bitcasting functionality present in the legacy cse in the VPlan-based one, although the same might be the case for several shuffles/extractelements. I have some hope for the VPlan-based cse, but I think it is still in early stages: perhaps @fhahn is right, and we need to re-evaluate whether we need the cse-bitcast functionality.

https://github.com/llvm/llvm-project/pull/146856