[Mlir-commits] [mlir] [MLIR][LLVM] Add ProfileSummary module flag support (PR #138070)

[Tobias Gysi]

================
@@ -554,13 +554,277 @@ static Attribute convertCGProfileModuleFlagValue(ModuleOp mlirModule,
   return ArrayAttr::get(mlirModule->getContext(), cgProfile);
 }
 
+static llvm::MDTuple *getTwoElementMDTuple(ModuleOp mlirModule,
+                                           const llvm::Module *llvmModule,
+                                           const llvm::MDOperand &md) {
+  auto *tupleEntry = dyn_cast_or_null<llvm::MDTuple>(md);
+  if (!tupleEntry || tupleEntry->getNumOperands() != 2)
+    emitWarning(mlirModule.getLoc())
+        << "expected 2-element tuple metadata: " << diagMD(md, llvmModule);
+  return tupleEntry;
+}
+
+static llvm::ConstantAsMetadata *getConstantMDFromKeyValueTuple(
+    ModuleOp mlirModule, const llvm::Module *llvmModule,
+    const llvm::MDOperand &md, StringRef matchKey, bool optional = false) {
+  llvm::MDTuple *tupleEntry = getTwoElementMDTuple(mlirModule, llvmModule, md);
+  if (!tupleEntry)
+    return nullptr;
+  llvm::MDString *keyMD = dyn_cast<llvm::MDString>(tupleEntry->getOperand(0));
----------------
gysit wrote:

```suggestion
  auto *keyMD = dyn_cast<llvm::MDString>(tupleEntry->getOperand(0));
```
ultra nit: auto would be ok here.

https://github.com/llvm/llvm-project/pull/138070