[Mlir-commits] [mlir] [mlir][ArmSME] Support 2-way widening outer products (PR #78975)

[Benjamin Maxwell]

================
@@ -814,6 +814,295 @@ let arguments = (ins
   }];
 }
 
+class OuterProductWideningBase<string mnemonic,
+                               list<Type> allowedInputVectorTypes,
+                               list<Type> allowedResultVectorTypes,
+                               int numOuterProducts> :
+  ArmSME_Op<mnemonic, [
+    ArmSMETileOpInterface,
+    AttrSizedOperandSegments,
+    AllTypesMatch<["lhs", "rhs"]>,
+    HasMatchingMaskTypeConstraint<"lhs", "lhsMask">,
+    HasMatchingMaskTypeConstraint<"rhs", "rhsMask">,
+    PredOpTrait<
+      "both `lhsMask` and `rhsMask` should be provided or neither",
+      CPred<"bool(getLhsMask()) == bool(getRhsMask())">
+    >,
+    OptionalTypesMatchWith<"result and acc have the same type",
+                           "result", "acc", "::llvm::cast<Type>($_self)">,
+    // this trait ensures the input type match the correct output type for ops
+    // that takes multiple inputs and outputs (i.e., 4-way).
----------------
MacDue wrote:

```suggestion
    // This trait ensures the input types match the correct output type for ops
    // that takes multiple inputs and outputs (i.e., 4-way).
```

https://github.com/llvm/llvm-project/pull/78975