add a comment

Signed-off-by: hanhanW <[email protected]>

Author: hanhanW

mlir/lib/Dialect/Linalg/Transforms/TilingInterfaceImpl.cpp

@@ -911,7 +911,9 @@ struct PackOpTiling
 
         // If a dimension is not tiled, it is always valid to fuse the pack op,
         // even if the op has padding semantics. Because it always generates a
-        // full slice along the dimension.
+        // full slice along the dimension. The tile sizes are for unpacked
+        // domain, i.e., `srcDimSize`, so `tileSize < srcDimSize` means no
+        // tiling at all.
         // TODO: It could be untiled if the `srcDimSize` is dynamic. It is a
         // hard check to determine if a dimension is tiled or not.
         int64_t srcDimSize = packOp.getSourceType().getDimSize(dim);