[Mlir-commits] [mlir] [mlir][LLVMIR] Support memory model relaxation annotations (MMRA) (PR #157770)

[Krzysztof Drewniak]

================
@@ -1232,6 +1232,47 @@ def LLVM_TBAATagArrayAttr
   let constBuilderCall = ?;
 }
 
+//===----------------------------------------------------------------------===//
+// Memory Model Relaxation Annations (mmra) Attributes
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// MMRATagAttr - single MMRA tag
+//===----------------------------------------------------------------------===//
+
+def LLVM_MMRATagAttr : LLVM_Attr<"MMRATag", "mmra_tag"> {
+  let parameters = (ins
+    StringRefParameter<>:$prefix,
+    StringRefParameter<>:$suffix
+  );
+
+  let summary = "MLIR wrapper around a prefix:suffix MMRA tag";
+
+  let description = [{
+    Defines a single memory model relaxation annotation (MMRA) entry
+    with prefix `$prefix` and suffix `$suffix`. This corresponds directly
+    to a LLVM `!{prefix, suffix}` metadata tuple, which is often written
+    `prefix:shuffix` as shorthand.
+
+    Example:
+    ```mlir
+    #mmra_tag = #llvm.mmmra_tag<"amdgpu-synchronize-as":"local">
+    #mmra_tag1 = #llvm.mmra_tag<"foo":"bar">
+    ```
+
+    See the following link for more details:
+    https://llvm.org/docs/MemoryModelRelaxationAnnotations.html
+  }];
+
+  let assemblyFormat = "`<` $prefix `` `:` `` $suffix `>`";
+
+  let genMnemonicAlias = 1;
+}
+
+def LLVM_MMRATagArrayAttr : TypedArrayAttrBase<
----------------
krzysz00 wrote:

No, good point ( you can't isa<> on this sort of thing because it isn't real)

https://github.com/llvm/llvm-project/pull/157770