change print format

Author: chencha3

mlir/include/mlir/Dialect/XeGPU/IR/XeGPUAttrs.td

@@ -64,6 +64,12 @@ def XeGPU_BlockTensorDescAttr: XeGPU_TensorDescAttr<"BlockTensorDesc", "block_td
     )>
   ];
 
+  let extraClassDeclaration = [{
+    // return true if all fields of the BlockTensorDescAttr are set with
+    // default values.
+    bool hasDefaultsOnly();
+  }];
+
 }
 
 def XeGPU_ScatterTensorDescAttr: XeGPU_TensorDescAttr<"ScatterTensorDesc", "scatter_tdesc_attr"> {

mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp

@@ -112,6 +112,11 @@ BlockTensorDescAttr BlockTensorDescAttr::get(mlir::MLIRContext *context,
   return Base::get(context, scopeAttr, lengthAttr, boundaryAttr);
 }
 
+bool BlockTensorDescAttr::hasDefaultsOnly() {
+  return getMemorySpace().getValue() == xegpu::MemorySpace::Global &&
+         getArrayLength().getInt() == 1 && getBoundaryCheck().getValue();
+}
+
 //===----------------------------------------------------------------------===//
 // XeGPU_ScatterTensorDescAttr
 //===----------------------------------------------------------------------===//
@@ -253,10 +258,11 @@ mlir::Type TensorDescType::parse(::mlir::AsmParser &parser) {
   if (parser.parseGreater())
     return {};
 
+  MLIRContext *ctxt = parser.getContext();
   return TensorDescType::getChecked(
-      [&]() { return parser.emitError(parser.getNameLoc()); },
-      parser.getContext(), shape, elementType,
-      encoding.value_or(mlir::Attribute()), layout.value_or(mlir::Attribute()));
+      [&]() { return parser.emitError(parser.getNameLoc()); }, ctxt, shape,
+      elementType, encoding.value_or(BlockTensorDescAttr::get(ctxt)),
+      layout.value_or(mlir::Attribute()));
 }
 
 void TensorDescType::print(::mlir::AsmPrinter &printer) const {
@@ -273,7 +279,9 @@ void TensorDescType::print(::mlir::AsmPrinter &printer) const {
 
   printer << getElementType();
 
-  if (auto encoding = getEncoding())
+  auto encoding = getEncoding();
+  auto blockAttr = llvm::dyn_cast_if_present<BlockTensorDescAttr>(encoding);
+  if (encoding && (!blockAttr || !blockAttr.hasDefaultsOnly()))
     printer << ", " << encoding;
 
   if (auto layout = getLayout())