[PATCH] D99230: [GlobalISel] Combine G_SEXT_INREG + right shift -> G_SBFX

[Jessica Paquette via Phabricator via llvm-commits]

paquette updated this revision to Diff 333128.
paquette added a comment.

I made this AArch64-specific for now.

Since G_UBFX/G_SBFX requires custom legalization, the legalization hooks in the CombinerHelper won't work for AArch64. Not sure what the best way to go about fixing that is.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D99230/new/

https://reviews.llvm.org/D99230

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/lib/Target/AArch64/AArch64Combine.td
  llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerCombiner.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/form-bitfield-extract-from-sextinreg.mir

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