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 #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_ASYNC_OP_CANONICALIZER_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_ASYNC_OP_CANONICALIZER_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 // This pass looks at all of the async operations in the module and assigns the 25 // async operations that participate in the same async action a unique async 26 // group id. Async operations in the same group id typically consist of one 27 // async-start operation, one async-done operation, and zero or more 28 // async-update operations. Then, this pass ensures all of the async operations 29 // with the same group id wrap the same computation such that each async 30 // computation is associated with all of the async operations that have the same 31 // group id. 32 class AsyncOpCanonicalizer : public HloModulePass { 33 public: 34 ~AsyncOpCanonicalizer() override = default; name()35 absl::string_view name() const override { return "async-op-canonicalizer"; } 36 using HloPassInterface::Run; 37 StatusOr<bool> Run( 38 HloModule* module, 39 const absl::flat_hash_set<absl::string_view>& execution_threads) override; 40 }; 41 42 } // namespace xla 43 44 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_ASYNC_OP_CANONICALIZER_H_ 45