1 /* Copyright 2018 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_GATHER_EXPANDER_H_ 17 #define TENSORFLOW_COMPILER_XLA_SERVICE_GATHER_EXPANDER_H_ 18 19 #include "tensorflow/compiler/xla/service/op_expander_pass.h" 20 21 namespace xla { 22 23 // This pass rewrites gather operations into (roughly) while loops of dynamic 24 // slices. This lets backends that don't support gather directly to 25 // nevertheless have a minimum level of support. 26 class GatherExpander : public OpExpanderPass { 27 public: name()28 absl::string_view name() const override { return "gather_expander"; } 29 30 protected: 31 bool InstructionMatchesPattern(HloInstruction* instruction) override; 32 33 StatusOr<HloInstruction*> ExpandInstruction( 34 HloInstruction* gather_inst) override; 35 }; 36 37 } // namespace xla 38 39 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_GATHER_EXPANDER_H_ 40