srishti-pm marked an inline comment as done.
srishti-pm added inline comments.


================
Comment at: mlir/lib/Transforms/Utils/CommutativityUtils.cpp:110
+  /// operand at a particular point in time.
+  DenseSet<Operation *> visitedAncestors;
+
----------------
Mogball wrote:
> Since this is a set of pointers expected to be small, you can use 
> `SmallPtrSet` for a big efficiency boost (linear scan instead of hashing when 
> small).
This set isn't expected to be small, right? There can be many ancestors. The 
only thing that is small in this context is the number of operands, right?


Repository:
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CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124750/new/

https://reviews.llvm.org/D124750

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