[clang] [clang-tools-extra] [llvm] [mlir] [mlir][TilingInterface] Early return cloned ops if tile sizes are zeros. (PR #75410)

[Han-Chung Wang via cfe-commits]

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@@ -362,14 +362,20 @@ mlir::scf::tileUsingSCFForOp(RewriterBase &rewriter, TilingInterface op,
   auto clonedOp = cast<TilingInterface>(
       cloneOpAndUpdateDestinationArgs(rewriter, op, clonedOpDestination));
 
-  // 5b. Tile the cloned operation.
+  // 5b. Early return cloned op if tiling is not happening.
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hanhanW wrote:

I just tested it locally, and think it makes sense to return the cloned op. The suggestion will lead to `rewriter.replace(op, op->getResults())` and get the crash. Returning the cloned op instead of `op` itself or `failure` makes more sense in this case. I will add some comments to it.

https://github.com/llvm/llvm-project/pull/75410