[Mlir-commits] [mlir] [mlir][Vector] Add `vector.shuffle` tree transformation (PR #145740)

[James Newling]

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@@ -297,6 +297,13 @@ void populateVectorBitCastLoweringPatterns(RewritePatternSet &patterns,
 /// n > 1.
 void populateVectorRankReducingFMAPattern(RewritePatternSet &patterns);
 
+/// Populate patterns to rewrite sequences of `vector.to_elements` +
+/// `vector.from_elements` operations into a tree of `vector.shuffle`
+/// operations.
+void populateVectorToFromElementsToShuffleTreePatterns(
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newling wrote:

Do you envisage this being used more directly as a pattern, or as the pass `lower-vector-to-from-elements-to-shuffle-tree`? I suppose that if it were to be used only as a pass, it would be more efficient if implemented directly as a walk over all ops (just a thought, not a request for change). 

https://github.com/llvm/llvm-project/pull/145740