[PATCH] D46492: [DAGCombiner] Masked merge: don't touch "not" xor's.

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
lebedev.ri added reviewers: spatel, craig.topper.
Herald added a reviewer: javed.absar.

Split off form https://reviews.llvm.org/D46031.

It seems we don't want to transform the pattern if the `xor`'s are actually `not`'s.
In vector case, this breaks `andnpd` / `vandnps` patterns.

That being said, we may want to re-visit this `not` handling, maybe in https://reviews.llvm.org/D46073.


Repository:
  rL LLVM

https://reviews.llvm.org/D46492

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/unfold-masked-merge-scalar-variablemask.ll
  test/CodeGen/X86/unfold-masked-merge-scalar-variablemask.ll

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