1 /* Copyright 2021 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_ALL_GATHER_BROADCAST_REORDER_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_ALL_GATHER_BROADCAST_REORDER_H_ 18 19 #include "tensorflow/compiler/xla/service/hlo_module.h" 20 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 21 #include "tensorflow/compiler/xla/statusor.h" 22 23 namespace xla { 24 25 // A pass that reorders all-gather(broadcast(x)) -> broadcast(all-gather(x)). 26 // The intent is to reduce the size of all-gather when possible by doing an 27 // all-gather on the (smaller) pre-broadcasted data and then applying the 28 // broadcast. 29 class AllGatherBroadcastReorder : public HloModulePass { 30 public: name()31 absl::string_view name() const override { return "all-gather-bcast-reorder"; } 32 33 using HloPassInterface::Run; 34 StatusOr<bool> Run( 35 HloModule* module, 36 const absl::flat_hash_set<absl::string_view>& execution_threads) override; 37 }; 38 39 } // namespace xla 40 41 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_ALL_GATHER_BROADCAST_REORDER_H_ 42