| /* 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_WHILE_LOOP_SIMPLIFIER_H_ |
| #define TENSORFLOW_COMPILER_XLA_SERVICE_WHILE_LOOP_SIMPLIFIER_H_ |
| |
| #include "tensorflow/compiler/xla/service/hlo_module.h" |
| #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" |
| #include "tensorflow/compiler/xla/statusor.h" |
| |
| namespace xla { |
| |
| // HLO pass that makes the following transformations on while loops: |
| // |
| // - A while loop with static trip count of 0 is deleted. |
| // - A while loop with static trip count of 1 is replaced by its body (sans |
| // loop). |
| // - Elements of a while loop's tuple that the loop doesn't use are removed |
| // from the tuple. |
| // |
| class WhileLoopSimplifier : public HloModulePass { |
| public: |
| ~WhileLoopSimplifier() override {} |
| absl::string_view name() const override { return "simplify-while-loops"; } |
| StatusOr<bool> Run(HloModule* module) override; |
| }; |
| |
| } // namespace xla |
| |
| #endif // TENSORFLOW_COMPILER_XLA_SERVICE_WHILE_LOOP_SIMPLIFIER_H_ |