[PATCH] D86056: GlobalISel: Revisit users of other merge opcodes in artifact combiner

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: aemerson, paquette, dsanders, aditya_nandakumar, Petar.Avramovic, foad, mbrkusanin.
Herald added subscribers: kerbowa, rovka, nhaehnle, jvesely.
Herald added a project: LLVM.
arsenm requested review of this revision.
Herald added a subscriber: wdng.

The artifact combiner searches for the uses of G_MERGE_VALUES for
unmerge/trunc that need further combining. This also needs to handle
the vector merge opcodes the same way. This fixes leaving behind some
pairs I expected to be removed, that were if the legalizer is run a
second time.


https://reviews.llvm.org/D86056

Files:
  llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
  llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-build-vector.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-concat-vectors.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-unmerge-values.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fcopysign.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/saddsat.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/ssubsat.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/uaddsat.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/usubsat.ll

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