[PATCH] D135850: [AArch64][3/4]Enhance 'isBitfieldPositioningOp' to find pattern (shl(and(val,mask), N)

[Dave Green via Phabricator via llvm-commits]

dmgreen added reviewers: t.p.northover, efriedma.
dmgreen added a comment.

This seems similar to a demand bits fold. Can it check that `AndMask` is a superset of `AllOnes >> Shift`?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D135850/new/

https://reviews.llvm.org/D135850