[PATCH] D138067: GlobalISel: Try to fold G_SEXT_INREG to G_AND with mask

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: paquette, aemerson, Pierre-vh, foad, dsanders, Petar.Avramovic.
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Copies the same transform from the DAG. Helps eliminate some codegen
diffs to allowed shared checks in a future change.

      

Not sure if apply supports anything better than C++ fragments for
the result. It's also not really reasonable that every combine has
to set the default insertion point.


https://reviews.llvm.org/D138067

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/test/CodeGen/AMDGPU/GlobalISel/postlegalizercombiner-sext_inreg-to-and.mir

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