[OpenACC] Add reduction recipe helper to ACC Dialect (llvm#154566)

Similar to how we did for private/firstprivate, these helper functions
should make generating the recipes for the Clang FE easier.

Author: erichkeane

mlir/include/mlir/Dialect/OpenACC/OpenACCOps.td

@@ -1540,6 +1540,11 @@ def OpenACC_ParallelOp : OpenACC_Op<"parallel",
     /// recipe.
     void addFirstPrivatization(MLIRContext *, mlir::acc::FirstprivateOp op,
                                mlir::acc::FirstprivateRecipeOp recipe);
+
+    /// Adds a reduction clause variable to this operation, including its
+    /// recipe.
+    void addReduction(MLIRContext *, mlir::acc::ReductionOp op,
+                      mlir::acc::ReductionRecipeOp recipe);
   }];
 
   let assemblyFormat = [{
@@ -1689,6 +1694,10 @@ def OpenACC_SerialOp : OpenACC_Op<"serial",
     /// recipe.
     void addFirstPrivatization(MLIRContext *, mlir::acc::FirstprivateOp op,
                                mlir::acc::FirstprivateRecipeOp recipe);
+    /// Adds a reduction clause variable to this operation, including its
+    /// recipe.
+    void addReduction(MLIRContext *, mlir::acc::ReductionOp op,
+                      mlir::acc::ReductionRecipeOp recipe);
   }];
 
   let assemblyFormat = [{
@@ -2415,6 +2424,10 @@ def OpenACC_LoopOp : OpenACC_Op<"loop",
     /// Adds a private clause variable to this operation, including its recipe.
     void addPrivatization(MLIRContext *, mlir::acc::PrivateOp op,
                           mlir::acc::PrivateRecipeOp recipe);
+    /// Adds a reduction clause variable to this operation, including its
+    /// recipe.
+    void addReduction(MLIRContext *, mlir::acc::ReductionOp op,
+                      mlir::acc::ReductionRecipeOp recipe);
   }];
 
   let hasCustomAssemblyFormat = 1;

mlir/lib/Dialect/OpenACC/IR/OpenACC.cpp

@@ -1404,6 +1404,22 @@ void acc::ParallelOp::addFirstPrivatization(
       mlir::SymbolRefAttr::get(context, recipe.getSymName().str()));
   setFirstprivatizationRecipesAttr(mlir::ArrayAttr::get(context, recipes));
 }
+
+void acc::ParallelOp::addReduction(MLIRContext *context,
+                                   mlir::acc::ReductionOp op,
+                                   mlir::acc::ReductionRecipeOp recipe) {
+  getReductionOperandsMutable().append(op.getResult());
+
+  llvm::SmallVector<mlir::Attribute> recipes;
+
+  if (getReductionRecipesAttr())
+    llvm::copy(getReductionRecipesAttr(), std::back_inserter(recipes));
+
+  recipes.push_back(
+      mlir::SymbolRefAttr::get(context, recipe.getSymName().str()));
+  setReductionRecipesAttr(mlir::ArrayAttr::get(context, recipes));
+}
+
 static ParseResult parseNumGangs(
     mlir::OpAsmParser &parser,
     llvm::SmallVectorImpl<mlir::OpAsmParser::UnresolvedOperand> &operands,
@@ -2070,6 +2086,21 @@ void acc::SerialOp::addFirstPrivatization(
   setFirstprivatizationRecipesAttr(mlir::ArrayAttr::get(context, recipes));
 }
 
+void acc::SerialOp::addReduction(MLIRContext *context,
+                                 mlir::acc::ReductionOp op,
+                                 mlir::acc::ReductionRecipeOp recipe) {
+  getReductionOperandsMutable().append(op.getResult());
+
+  llvm::SmallVector<mlir::Attribute> recipes;
+
+  if (getReductionRecipesAttr())
+    llvm::copy(getReductionRecipesAttr(), std::back_inserter(recipes));
+
+  recipes.push_back(
+      mlir::SymbolRefAttr::get(context, recipe.getSymName().str()));
+  setReductionRecipesAttr(mlir::ArrayAttr::get(context, recipes));
+}
+
 //===----------------------------------------------------------------------===//
 // KernelsOp
 //===----------------------------------------------------------------------===//
@@ -3088,6 +3119,20 @@ void acc::LoopOp::addPrivatization(MLIRContext *context,
   setPrivatizationRecipesAttr(mlir::ArrayAttr::get(context, recipes));
 }
 
+void acc::LoopOp::addReduction(MLIRContext *context, mlir::acc::ReductionOp op,
+                               mlir::acc::ReductionRecipeOp recipe) {
+  getReductionOperandsMutable().append(op.getResult());
+
+  llvm::SmallVector<mlir::Attribute> recipes;
+
+  if (getReductionRecipesAttr())
+    llvm::copy(getReductionRecipesAttr(), std::back_inserter(recipes));
+
+  recipes.push_back(
+      mlir::SymbolRefAttr::get(context, recipe.getSymName().str()));
+  setReductionRecipesAttr(mlir::ArrayAttr::get(context, recipes));
+}
+
 //===----------------------------------------------------------------------===//
 // DataOp
 //===----------------------------------------------------------------------===//