[PATCH] D76601: [GlobalISel] combine trunc(trunc) pattern

[Dominik Montada via Phabricator via llvm-commits]

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

Legalization can introduce the trunc(trunc) pattern. This can cause
problems if one of these intermediate truncs is not legal.
Combine truncs of this pattern, if the resulting trunc is legal.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D76601

Files:
  llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
  llvm/test/CodeGen/AArch64/GlobalISel/legalize-load-trunc.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/artifact-combiner-trunc.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-bitcast.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-extract.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-inttoptr.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-trunc.mir

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