[PATCH] D134953: [AMDGPU][GISel] Add Identity BUILD_VECTOR Combines

[Pierre van Houtryve via Phabricator via llvm-commits]

Pierre-vh created this revision.
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Folds-away BUILD_VECTOR-related noops in the post-legalizer combiner.

Depends on D134433 <https://reviews.llvm.org/D134433>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134953

Files:
  llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
  llvm/lib/Target/AMDGPU/AMDGPUCombine.td
  llvm/lib/Target/AMDGPU/AMDGPUPostLegalizerCombiner.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-ext-mul.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-add-mul.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.load.1d.d16.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/postlegalizer-combiner-buildvector-identities.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/postlegalizer-combiner-trunc-bitcast-buildvector.mir

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