[PATCH] D134635: [AMDGPU][GlobalISel] Add Shift/Shufflevector Combine

[Pierre van Houtryve via Phabricator via llvm-commits]

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Folds G_LSHR + G_SHUFFLEVECTOR away when the shift amount
is 1/2 of the destination scalar size, and the mask starts with 1.

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


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134635

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCombine.td
  llvm/lib/Target/AMDGPU/AMDGPURegBankCombiner.cpp
  llvm/test/CodeGen/AMDGPU/GlobalISel/combine-shift-shufflevector.mir

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