[PATCH] D79567: [GlobalISel] Combine scalar unmerge(trunc)

[Dominik Montada via Phabricator via llvm-commits]

gargaroff created this revision.
gargaroff added reviewers: arsenm, aditya_nandakumar, volkan.
Herald added subscribers: llvm-commits, kerbowa, rovka, nhaehnle, wdng, jvesely.
Herald added a project: LLVM.

Combine unmerge(trunc) to enable other merge combines.
Without this combine, the scalar unmerge(trunc(merge))
pattern cannot be combined and easily lead to
hard-to-legalize merge/unmerge artifacts.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79567

Files:
  llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-unmerge-values.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-unmerge-values.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-bitcast.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-freeze.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-merge-values.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-unmerge-values.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/zextload.ll

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