[PATCH] D64452: GlobalISel: Fold out unmerge to scalars from concat_vector

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, aditya_nandakumar, paquette.
Herald added subscribers: Petar.Avramovic, rovka, nhaehnle, wdng, jvesely.
arsenm added a parent revision: D64436: GlobalISel: Combine unmerge of merge with intermediate cast     .

Removes illegal intermediate vectors if an operation was lowering to
concat_vectors, and the next operation is scalarized.


https://reviews.llvm.org/D64452

Files:
  include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
  test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-unmerge-values.mir
  test/CodeGen/AMDGPU/GlobalISel/legalize-phi.mir

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