[PATCH] D65473: GlobalISel: Avoid widening unmerge with matching source type

[Matt Arsenault via Phabricator via llvm-commits]

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

If the target result type matches the original source, don't widen the
source register.

      

Also continue converging AMDGPU merge/unmerge legality rules towards
what they should be.


https://reviews.llvm.org/D65473

Files:
  lib/CodeGen/GlobalISel/LegalizerHelper.cpp
  lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-unmerge-values.mir
  test/CodeGen/AMDGPU/GlobalISel/legalize-merge-values.mir
  test/CodeGen/AMDGPU/GlobalISel/legalize-unmerge-values.mir

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