[Mlir-commits] [mlir] [mlir][Vector] Reject scalable outer dim in multi_reduction unrolling (PR #224174)

[Cheng-Chieh Liu]

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@@ -356,6 +356,10 @@ struct TwoDimMultiReductionToElementWise
     if (multiReductionOp.isReducedDim(1) || !multiReductionOp.isReducedDim(0))
       return failure();
 
+    if (multiReductionOp.getSourceVectorType().getScalableDims()[0])
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jay87406 wrote:

Added a comment + TODO above both bails explaining why scalable outer dims are rejected (the static size is only the vscale = 1 minimum, so unrolling would drop lanes). Also noted it in the pattern docs in `LoweringPatterns.h`.

https://github.com/llvm/llvm-project/pull/224174