[Mlir-commits] [mlir] [mlir][Vector] Add a rewrite pattern for gather over a strided memref (PR #72991)

[Andrzej Warzyński]

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@@ -96,6 +96,87 @@ struct FlattenGather : OpRewritePattern<vector::GatherOp> {
   }
 };
 
+/// Rewrites a vector.gather of a strided MemRef as a gather of a non-strided
+/// MemRef with updated indices that model the strided access.
+///
+/// ```mlir
+/// %subview = memref.subview %M (...) memref<100x3xf32> to memref<100xf32,
+/// strided<[3]>> %gather = vector.gather %subview (...) : memref<100xf32,
+/// strided<[3]>>
+/// ```
+/// ==>
+/// ```mlir
+/// %collapse_shape = memref.collapse_shape %M (...) memref<100x3xf32> into
+/// memref<300xf32> %1 = arith.muli %idxs, %c3 : vector<4xindex> %gather =
+/// vector.gather %collapse_shape (...) : memref<300xf32> (...)
+/// ```
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banach-space wrote:

Argh, that's clang-format, sorry :( Thanks for pointing it out! 🙏🏻 

https://github.com/llvm/llvm-project/pull/72991