1 /* Copyright 2017 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 #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_CPU_CPU_COPY_INSERTION_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_CPU_CPU_COPY_INSERTION_H_ 18 19 #include "tensorflow/compiler/xla/service/hlo_module.h" 20 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 21 22 namespace xla { 23 24 // Besides the modifications made by the generic xla::CopyInsertion, this 25 // CPU-specific copy insertion pass also adds copies to values live out of 26 // computations satisfying certain conditions (defined by constant or parameter, 27 // etc). This is necessary because of deficiencies of buffer 28 // assignment. Specifically, buffer assignment is computation-scoped and does 29 // not recognized aliasing between arguments and outputs of computations. 30 // 31 // TODO(b/62548313): Remove this when buffer assignment is smarter 32 // (module-scoped). 33 class CpuCopyInsertion : public HloModulePass { 34 public: name()35 absl::string_view name() const override { return "copy-insertion"; } 36 37 StatusOr<bool> Run(HloModule* module) override; 38 }; 39 40 } // namespace xla 41 42 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_CPU_CPU_COPY_INSERTION_H_ 43