[PATCH] D135380: [GlobalISel] Combine (X op Y) == X --> Y == 0

[Jessica Paquette via Phabricator via llvm-commits]

paquette created this revision.
paquette added reviewers: aemerson, arsenm.
Herald added subscribers: hiraditya, rovka.
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paquette requested review of this revision.
Herald added a subscriber: wdng.
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This matches patterns of the form

  (X op Y) == X

And transforms them to

  Y == 0

where appropriate.

Example: https://godbolt.org/z/hfW811c7W


https://reviews.llvm.org/D135380

Files:
  llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
  llvm/include/llvm/Target/GlobalISel/Combine.td
  llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/combine-icmp-of-binop-to-icmp-of-0.mir

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