[PATCH] D159140: [GlobalISel] LegalizationArtifactCombiner: Elide redundant G_AND

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


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Comment at: llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h:143
+      // Elide AND if it is proven redundant (e.g between boolean uses and defs)
+      if (KB && (KB->getKnownZeroes(AndSrc) | ExtMaskVal).isAllOnes()) {
+        replaceRegOrBuildCopy(DstReg, AndSrc, MRI, Builder, UpdatedDefs,
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How much of the benefit is there from only handling the constant case?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D159140/new/

https://reviews.llvm.org/D159140