[PATCH] D45733: [DAGCombiner] Unfold scalar masked merge if profitable

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

In https://reviews.llvm.org/D45733#1071068, @lebedev.ri wrote:

> I don't think it will be possible to check that until after the instcombine part has landed, so ok, at least for now i will stop unfolding [constant mask] in dagcombine.
>
> While there, any hint re pattern matchers for this code?


Unfortunately, DAG nodes don't have any equivalent match() infrastructure like IR that I know of. The commuted variants are what complicate this? Usually, I think we just std::swap() our way to the answer here in the DAG.


Repository:
  rL LLVM

https://reviews.llvm.org/D45733