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

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

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.


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