1 /* Copyright 2022 The TensorFlow Authors. All Rights Reserved. 2 3 Licensed under the Apache License, Version 2.0 (the "License"); 4 you may not use this file except in compliance with the License. 5 You may obtain a copy of the License at 6 7 http://www.apache.org/licenses/LICENSE-2.0 8 9 Unless required by applicable law or agreed to in writing, software 10 distributed under the License is distributed on an "AS IS" BASIS, 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 See the License for the specific language governing permissions and 13 limitations under the License. 14 ==============================================================================*/ 15 16 #include "mlir/Dialect/Func/IR/FuncOps.h" // from @llvm-project 17 #include "mlir/IR/Builders.h" // from @llvm-project 18 #include "mlir/IR/Operation.h" // from @llvm-project 19 #include "mlir/Interfaces/SideEffectInterfaces.h" // from @llvm-project 20 #include "mlir/Support/LogicalResult.h" // from @llvm-project 21 #include "mlir/Transforms/Passes.h" // from @llvm-project 22 #include "tensorflow/dtensor/mlir/dtensor_mlir_passes.h" 23 #include "tensorflow/dtensor/mlir/dtensor_mlir_passes_classes.h" 24 25 namespace tensorflow { 26 namespace dtensor { 27 28 namespace { 29 30 // MLIR pass that removes trivially unused operations in graph. 31 struct DTensorDCE : public DTensorDCEBase<DTensorDCE> { runOnOperationtensorflow::dtensor::__anon96b2e55c0111::DTensorDCE32 void runOnOperation() override { 33 mlir::MLIRContext& context = getContext(); 34 mlir::OpBuilder builder(&context); 35 getOperation().walk([](mlir::Operation* op) { 36 if (mlir::isOpTriviallyDead(op)) op->erase(); 37 }); 38 } 39 }; 40 41 } // namespace 42 CreateDTensorDCE()43std::unique_ptr<mlir::OperationPass<mlir::func::FuncOp>> CreateDTensorDCE() { 44 return std::make_unique<DTensorDCE>(); 45 } 46 47 } // namespace dtensor 48 } // namespace tensorflow 49