[PATCH] D65441: GlobalISel: Improve widenScalar for G_UNMERGE_VALUES

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, aditya_nandakumar, paquette, dsanders.
Herald added subscribers: Petar.Avramovic, volkan, rovka, nhaehnle, wdng, jvesely.

Create sub-unmerges instead of immediately extending to the requested
size. This avoids very ugly expansions with wide types.


https://reviews.llvm.org/D65441

Files:
  lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  test/CodeGen/AMDGPU/GlobalISel/legalize-unmerge-values.mir

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