[PATCH] D132483: [AMDGPU][GlobalISel] Improve BFI Pattern Matching

[Pierre van Houtryve via Phabricator via llvm-commits]

Pierre-vh created this revision.
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- Introduce a simple "Copy Hoisting" post RegBankAssign combine to prevent stray COP¨Y instructions from interfering with pattern matching.
- Prevent introduction of useless UNMERGE_VALUEs  when splitting i64 values that also interfere with pattern matching.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132483

Files:
  llvm/lib/Target/AMDGPU/AMDGPUCombine.td
  llvm/lib/Target/AMDGPU/AMDGPURegBankCombiner.cpp
  llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
  llvm/lib/Target/AMDGPU/SIInstructions.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/fshl.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/fshr.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.i16.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.i8.ll
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankcombiner-clamp-minmax-const.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankcombiner-fmed3-minmax-const.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankcombiner-smed3.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankcombiner-umed3.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-and.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-or.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-xor.mir
  llvm/test/CodeGen/AMDGPU/GlobalISel/xnor.ll
  llvm/test/CodeGen/AMDGPU/bfi_int.ll
  llvm/test/CodeGen/AMDGPU/cttz_zero_undef.ll

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