[mlir][spirv] Make CooperativeMatrixType a ShapedType (#142784)

This is to enable `CooperativeMatrixType` to be used with
`DenseElementsAttr`, so that a `spirv.Constant` can be easily built from
`OpConstantComposite`. For example:

```mlir
%cst = spirv.Constant dense<0.000000e+00> : !spirv.coopmatrix<1x1xf32, Subgroup, MatrixAcc>
```

Constraints of arithmetic operations are changed, as
`SameOperandsAndResultType` can no longer fully verify CoopMatrices.
This is because for shaped types the verifier only checks element type
and shapes, whereas for any other arbitrary type it looks for an exact
match.

This patch does not enable the actual deserialization. This will be
done in a subsequent PR.

mlir/include/mlir/Dialect/SPIRV/IR/SPIRVArithmeticOps.td

@@ -23,7 +23,7 @@ class SPIRV_ArithmeticBinaryOp<string mnemonic, Type type,
       // Operands type same as result type.
       SPIRV_BinaryOp<mnemonic, type, type,
                    !listconcat(traits,
-                               [Pure, SameOperandsAndResultType])> {
+                               [Pure, AllTypesMatch<["operand1", "operand2", "result"]>])> {
   // In addition to normal types arithmetic instructions can support cooperative
   // matrix.
   let arguments = (ins
@@ -42,7 +42,7 @@ class SPIRV_ArithmeticUnaryOp<string mnemonic, Type type,
       // Operand type same as result type.
       SPIRV_UnaryOp<mnemonic, type, type,
                    !listconcat(traits,
-                               [Pure, SameOperandsAndResultType])> {
+                               [Pure, AllTypesMatch<["operand", "result"]>])> {
   // In addition to normal types arithmetic instructions can support cooperative
   // matrix.
   let arguments = (ins

mlir/include/mlir/Dialect/SPIRV/IR/SPIRVTypes.h

@@ -394,7 +394,8 @@ hash_value(const StructType::MemberDecorationInfo &memberDecorationInfo);
 // SPIR-V KHR cooperative matrix type
 class CooperativeMatrixType
     : public Type::TypeBase<CooperativeMatrixType, CompositeType,
-                            detail::CooperativeMatrixTypeStorage> {
+                            detail::CooperativeMatrixTypeStorage,
+                            ShapedType::Trait> {
 public:
   using Base::Base;
 
@@ -418,6 +419,22 @@ public:
                      std::optional<StorageClass> storage = std::nullopt);
   void getCapabilities(SPIRVType::CapabilityArrayRefVector &capabilities,
                        std::optional<StorageClass> storage = std::nullopt);
+
+  operator ShapedType() const { return llvm::cast<ShapedType>(*this); }
+
+  ArrayRef<int64_t> getShape() const;
+
+  bool hasRank() const { return true; }
+
+  CooperativeMatrixType cloneWith(std::optional<ArrayRef<int64_t>> shape,
+                                  Type elementType) const {
+    if (!shape)
+      return get(elementType, getRows(), getColumns(), getScope(), getUse());
+
+    assert(shape.value().size() == 2);
+    return get(elementType, shape.value()[0], shape.value()[1], getScope(),
+               getUse());
+  }
 };
 
 // SPIR-V matrix type

mlir/lib/Dialect/SPIRV/IR/SPIRVTypes.cpp

@@ -194,8 +194,21 @@ std::optional<int64_t> CompositeType::getSizeInBytes() {
 //===----------------------------------------------------------------------===//
 
 struct spirv::detail::CooperativeMatrixTypeStorage final : TypeStorage {
+  // In the specification dimensions of the Cooperative Matrix are 32-bit
+  // integers --- the initial implementation kept those values as such. However,
+  // the `ShapedType` expects the shape to be `int64_t`. We could keep the shape
+  // as 32-bits and expose it as int64_t through `getShape`, however, this
+  // method returns an `ArrayRef`, so returning `ArrayRef<int64_t>` having two
+  // 32-bits integers would require an extra logic and storage. So, we diverge
+  // from the spec and internally represent the dimensions as 64-bit integers,
+  // so we can easily return an `ArrayRef` from `getShape` without any extra
+  // logic. Alternatively, we could store both rows and columns (both 32-bits)
+  // and shape (64-bits), assigning rows and columns to shape whenever
+  // `getShape` is called. This would be at the cost of extra logic and storage.
+  // Note: Because `ArrayRef` is returned we cannot construct an object in
+  // `getShape` on the fly.
   using KeyTy =
-      std::tuple<Type, uint32_t, uint32_t, Scope, CooperativeMatrixUseKHR>;
+      std::tuple<Type, int64_t, int64_t, Scope, CooperativeMatrixUseKHR>;
 
   static CooperativeMatrixTypeStorage *
   construct(TypeStorageAllocator &allocator, const KeyTy &key) {
@@ -204,17 +217,17 @@ struct spirv::detail::CooperativeMatrixTypeStorage final : TypeStorage {
   }
 
   bool operator==(const KeyTy &key) const {
-    return key == KeyTy(elementType, rows, columns, scope, use);
+    return key == KeyTy(elementType, shape[0], shape[1], scope, use);
   }
 
   CooperativeMatrixTypeStorage(const KeyTy &key)
-      : elementType(std::get<0>(key)), rows(std::get<1>(key)),
-        columns(std::get<2>(key)), scope(std::get<3>(key)),
+      : elementType(std::get<0>(key)),
+        shape({std::get<1>(key), std::get<2>(key)}), scope(std::get<3>(key)),
         use(std::get<4>(key)) {}
 
   Type elementType;
-  uint32_t rows;
-  uint32_t columns;
+  // [#rows, #columns]
+  std::array<int64_t, 2> shape;
   Scope scope;
   CooperativeMatrixUseKHR use;
 };
@@ -231,10 +244,18 @@ Type CooperativeMatrixType::getElementType() const {
   return getImpl()->elementType;
 }
 
-uint32_t CooperativeMatrixType::getRows() const { return getImpl()->rows; }
+uint32_t CooperativeMatrixType::getRows() const {
+  assert(getImpl()->shape[0] != ShapedType::kDynamic);
+  return static_cast<uint32_t>(getImpl()->shape[0]);
+}
 
 uint32_t CooperativeMatrixType::getColumns() const {
-  return getImpl()->columns;
+  assert(getImpl()->shape[1] != ShapedType::kDynamic);
+  return static_cast<uint32_t>(getImpl()->shape[1]);
+}
+
+ArrayRef<int64_t> CooperativeMatrixType::getShape() const {
+  return getImpl()->shape;
 }
 
 Scope CooperativeMatrixType::getScope() const { return getImpl()->scope; }

mlir/test/Dialect/SPIRV/IR/khr-cooperative-matrix-ops.mlir

@@ -524,7 +524,7 @@ spirv.func @matrix_times_scalar(%a: !matA_f32, %b: f32) "None" {
 
 spirv.func @iadd(%a: !spirv.coopmatrix<2x2xi32, Subgroup, MatrixA>,
                  %b: !spirv.coopmatrix<2x2xi32, Subgroup, MatrixB>) "None" {
-  // expected-error @+1 {{op requires the same type for all operands and results}}
+  // expected-error @+1 {{failed to verify that all of {operand1, operand2, result} have same type}}
   %q = "spirv.IAdd"(%a, %b) :
     (!spirv.coopmatrix<2x2xi32, Subgroup, MatrixA>, !spirv.coopmatrix<2x2xi32, Subgroup, MatrixB>)
     -> !spirv.coopmatrix<2x2xi32, Subgroup, MatrixA>
@@ -535,7 +535,7 @@ spirv.func @iadd(%a: !spirv.coopmatrix<2x2xi32, Subgroup, MatrixA>,
 
 spirv.func @fadd(%a: !spirv.coopmatrix<2x2xf32, Subgroup, MatrixA>,
                  %b: !spirv.coopmatrix<2x2xf32, Subgroup, MatrixAcc>) "None" {
-  // expected-error @+1 {{op requires the same type for all operands and results}}
+  // expected-error @+1 {{failed to verify that all of {operand1, operand2, result} have same type}}
   %q = "spirv.FAdd"(%a, %b) :
     (!spirv.coopmatrix<2x2xf32, Subgroup, MatrixA>, !spirv.coopmatrix<2x2xf32, Subgroup, MatrixAcc>)
     -> !spirv.coopmatrix<2x2xf32, Subgroup, MatrixAcc>