| /* Copyright 2017 The TensorFlow Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==============================================================================*/ |
| |
| #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_HLO_CSE_H_ |
| #define TENSORFLOW_COMPILER_XLA_SERVICE_HLO_CSE_H_ |
| |
| #include "tensorflow/compiler/xla/service/hlo_module.h" |
| #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" |
| |
| namespace xla { |
| |
| // A pass which performs common-subexpression elimination. Identical constants |
| // and identical instructions with the same operands are commoned. The pass |
| // iterates over the instructions in topological order which enables the pass to |
| // find arbitrarily large common expressions. |
| class HloCSE : public HloModulePass { |
| public: |
| // If is_layout_sensitive is true, then the simplifier preserves layout during |
| // transformation. Otherwise, layout is ignored. |
| explicit HloCSE(bool is_layout_sensitive, |
| bool only_fusion_computations = false) |
| : is_layout_sensitive_(is_layout_sensitive), |
| only_fusion_computations_(only_fusion_computations) {} |
| ~HloCSE() override = default; |
| absl::string_view name() const override { return "cse"; } |
| |
| // Run CSE on the given module. Returns whether the module was changed (common |
| // subexpressions were found and eliminated). |
| StatusOr<bool> Run(HloModule* module) override; |
| |
| private: |
| const bool is_layout_sensitive_; |
| const bool only_fusion_computations_; |
| }; |
| |
| } // namespace xla |
| |
| #endif // TENSORFLOW_COMPILER_XLA_SERVICE_HLO_CSE_H_ |