[Mlir-commits] [mlir] [mlir][linalg] Restrict linalg.pack to not have artificial padding. (PR #149624)

[llvmlistbot at llvm.org]

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@@ -220,6 +243,29 @@ struct FoldPadWithPackOp : public OpRewritePattern<PackOp> {
       if (!isEqualConstantIntOrValue(paddingValue, constantPaddingValue))
         return failure();
 
+    // Folding is not allowed if it introduces artificial padding.
+    RankedTensorType unpackedType = packOp.getSourceType();
+    SmallVector<int64_t> outerShapeWithoutTranspose =
+        getPackedOuterShapeWithoutTransposition(packOp);
+    for (auto [pos, tileSize, high] :
+         llvm::zip_equal(packOp.getInnerDimsPos(), packOp.getStaticInnerTiles(),
+                         padOp.getMixedHighPad())) {
+      if (unpackedType.isDynamicDim(pos))
+        return failure();
+      if (ShapedType::isDynamic(outerShapeWithoutTranspose[pos]))
+        return failure();
+      if (ShapedType::isDynamic(tileSize))
----------------
Max191 wrote:

I think it could be legal to have a dynamic inner_tile size here. For example:
```
%pack = linalg.pack ... inner_tiles = [%tile] : tensor<7xf32> into tensor<2x?xf32>
```
`%tile` can still be dynamically anything in `[4, 7)`.

https://github.com/llvm/llvm-project/pull/149624