[PATCH] D139685: [DAGCombine]Expand usage of CreateBuildVecShuffle to make full use of vector ops

[Phoebe Wang via Phabricator via llvm-commits]

pengfei added a comment.

In D139685#4010658 <https://reviews.llvm.org/D139685#4010658>, @lebedev.ri wrote:

> FWIW, i've recently looked at this method, and, irrespectively of this particular patch,
> indeed it misses a quite big number of opportunities, but it also has a very high impact
> on the produced DAG, so coming up with the right preconditions is not easy. Alternatively,
> we need a significant amount of yak shawing to deal with the new patterns.

It would be great if we can figure out with meticulous patterns. But I think it's still fine to land this as a small step forward.


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