[PATCH] D116115: AMDGPU/GlobalISel: Rework legalization for extract/insert vector elt

[Petar Avramovic via Phabricator via llvm-commits]

Petar.Avramovic created this revision.
Petar.Avramovic added reviewers: arsenm, foad.
Herald added subscribers: kerbowa, hiraditya, t-tye, tpr, dstuttard, rovka, yaxunl, nhaehnle, jvesely, kzhuravl.
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Use G_MERGE_VALUES and G_UNMERGE_VALUES on vector elements instead of
G_EXTRACT and G_INSERT when doing custom legalization for
G_EXTRACT_VECTOR_ELT and  G_INSERT_VECTOR_ELT.
With this approach legalization artifact combiner gets simple access
to all vector elements.


https://reviews.llvm.org/D116115

Files:
  llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/bug-legalization-artifact-combiner-dead-def.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.large.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-extract-vector-elt.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-insert-vector-elt.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-shuffle-vector.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-shuffle-vector.s16.mir

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