[PATCH] D76135: [MachineLICM] Don't treat cross copies as cheap

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D76135#1921963 <https://reviews.llvm.org/D76135#1921963>, @dmgreen wrote:

> Thanks for the suggestion.
>
> I made it call shouldRewriteCopySrc, which allows the target to modify things if it wishes. The AMDGPU/idiv-licm.ll test changed ever so slightly. Let me know if I should change things around to instead call shareSameRegisterFile more directly.


If DetectDeadLanes also has the same code, then they should probably be merged and directly exposed


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