[Mlir-commits] [mlir] [MLIR][XeGPU] Support order attribute and add pattern for vector.transpose in WgToSg Pass (PR #165307)

[Nishant Patel]

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@@ -273,26 +273,76 @@ LayoutAttr::verify(llvm::function_ref<mlir::InFlightDiagnostic()> emitError,
 FailureOr<SmallVector<Value>>
 LayoutAttr::delinearizeSubgroupId(OpBuilder &builder, Location loc,
                                   Value linearId) {
-  // delinearizeSubgroupId is only available for
-  // workgroup-level layout attribute
   if (!isForWorkgroup())
     return failure();
 
-  // TODO: handle order attribute
-  auto hasDefaultOrder = [&]() {
-    DenseI32ArrayAttr order = getOrder();
-    return !order || isIdentityPermutation(llvm::to_vector_of<int64_t>(
-                         llvm::reverse(order.asArrayRef())));
-  };
-  if (!hasDefaultOrder())
-    return mlir::emitError(loc, "order attribute is currently not supported.");
+  SmallVector<int64_t> sgLayoutInt = getEffectiveSgLayoutAsInt();
+  DenseI32ArrayAttr orderAttr = getOrder();
 
-  auto dims =
-      llvm::map_to_vector(getEffectiveSgLayoutAsInt(), [&](int64_t d) -> Value {
-        return builder.createOrFold<arith::ConstantIndexOp>(loc, d);
-      });
+  // Handle order attribute
+  SmallVector<int64_t> order;
+  if (orderAttr && !orderAttr.empty()) {
+    order = llvm::to_vector(
+        llvm::map_range(orderAttr.asArrayRef(),
+                        [](int32_t idx) { return static_cast<int64_t>(idx); }));
+  } else {
+    // Default order: [1, 0] for 2D (row-major), [2, 1, 0] for 3D, etc.
+    order = llvm::to_vector(
+        llvm::reverse(llvm::seq<int64_t>(0, sgLayoutInt.size())));
+  }
 
-  return affine::delinearizeIndex(builder, loc, linearId, dims);
+  if (order.size() != sgLayoutInt.size()) {
+    return failure();
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nbpatel wrote:

we don't have handle for op here, everywhere we just return failure in this file

https://github.com/llvm/llvm-project/pull/165307