[Mlir-commits] [mlir] [MLIR][SCF] Fold dim ops of iter_args to respective init_args (PR #109973)

[Mehdi Amini]

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@@ -1478,6 +1478,45 @@ struct DimOfForallOp : public OpRewritePattern<tensor::DimOp> {
   }
 };
 
+/// Fold dim ops of iter_args to dim ops of their respective init args. E.g.:
+///
+/// ```
+/// %0 = ... : tensor<?x?xf32>
+/// scf.forall ... shared_outs(%arg0 = %0) -> (tensor<?x?xf32>) {
+///   %1 = tensor.dim %arg0, %c0 : tensor<?x?xf32>
+///   ...
+/// }
+/// ```
+///
+/// is folded to:
+///
+/// ```
+/// %0 = ... : tensor<?x?xf32>
+/// scf.forall ... shared_outs(%arg0 = %0) -> (tensor<?x?xf32>) {
+///   %1 = tensor.dim %0, %c0 : tensor<?x?xf32>
+///   ...
+/// }
+/// ```
+struct DimOfForallIterArg : public OpRewritePattern<tensor::DimOp> {
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joker-eph wrote:

Seems like more a canonicalization on the DimOp itself, which could look into LoopLikeOpInterface?

https://github.com/llvm/llvm-project/pull/109973