[Mlir-commits] [mlir] [mlir][vector] Fix invalid IR in `ContractionOpLowering` (PR #78130)

[Han-Chung Wang]

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@@ -458,49 +450,70 @@ struct UnrolledOuterProductGenerator
     return res;
   }
 
+  std::optional<int64_t> getReductionSize(VectorType vecType,
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hanhanW wrote:

Can you add a doc to the method? Otherwise, people need to look at implementation to understand when `std::nullopt` will be returned.

https://github.com/llvm/llvm-project/pull/78130