[Mlir-commits] [mlir] [flang][mlir] Add support for translating task_reduction to LLVMIR (PR #120957)

[Kareem Ergawy]

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@@ -1787,16 +1779,264 @@ convertOmpTaskOp(omp::TaskOp taskOp, llvm::IRBuilderBase &builder,
   return success();
 }
 
+template <typename OP>
+llvm::Value *createTaskReductionFunction(
+    llvm::IRBuilderBase &builder, const std::string &name, llvm::Type *redTy,
+    LLVM::ModuleTranslation &moduleTranslation,
+    SmallVectorImpl<omp::DeclareReductionOp> &reductionDecls, Region &region,
+    OP &op, unsigned Cnt, llvm::ArrayRef<bool> &isByRef,
+    SmallVectorImpl<llvm::Value *> &privateReductionVariables,
+    DenseMap<Value, llvm::Value *> &reductionVariableMap) {
+  llvm::LLVMContext &Context = builder.getContext();
+  llvm::Type *OpaquePtrTy = llvm::PointerType::get(Context, 0);
+  if (region.empty()) {
+    return llvm::Constant::getNullValue(OpaquePtrTy);
+  }
+  llvm::FunctionType *funcType = nullptr;
+  if (isByRef[Cnt])
+    funcType = llvm::FunctionType::get(builder.getVoidTy(),
+                                       {OpaquePtrTy, OpaquePtrTy}, false);
+  else
+    funcType =
+        llvm::FunctionType::get(OpaquePtrTy, {OpaquePtrTy, OpaquePtrTy}, false);
+  llvm::Function *function =
+      llvm::Function::Create(funcType, llvm::Function::ExternalLinkage, name,
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ergawy wrote:

For the name of the generated function, I think it would nice for debuggability to either prefix or suffix the symbol name of the `DeclareReductionOp` op.

https://github.com/llvm/llvm-project/pull/120957