1 /* Copyright 2019 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 #ifndef TENSORFLOW_COMPILER_XLA_SERVICE_GPU_REDUCTION_DIMENSION_GROUPER_H_ 16 #define TENSORFLOW_COMPILER_XLA_SERVICE_GPU_REDUCTION_DIMENSION_GROUPER_H_ 17 18 #include "absl/types/optional.h" 19 #include "tensorflow/compiler/xla/service/hlo_instructions.h" 20 #include "tensorflow/compiler/xla/service/hlo_module.h" 21 #include "tensorflow/compiler/xla/service/hlo_pass_interface.h" 22 23 namespace xla { 24 namespace gpu { 25 26 // Groups adjacent (logically and physically) reduced dimensions in reduction 27 // input. 28 // 29 // Precondition: ReductionLayoutNormalizer has been run (physical proximity and 30 // logical proximity become the same). 31 // 32 // For example, 33 // 34 // f[] out = reduce(f[10,20,30] input, dimensions={0,1,2}) 35 // 36 // becomes: 37 // 38 // f[600] tmp = f[600] bitcast(f[10,20,30] input) 39 // f[] out = reduce(f[600] tmp, dimensions={0}) 40 // 41 // TODO(cheshire): handle variadic reduction 42 class ReductionDimensionGrouper : public HloModulePass { 43 public: name()44 absl::string_view name() const override { 45 return "reduction-dimension-grouper"; 46 } 47 48 StatusOr<bool> Run(HloModule* module) override; 49 }; 50 51 } // namespace gpu 52 } // namespace xla 53 54 #endif // TENSORFLOW_COMPILER_XLA_SERVICE_GPU_REDUCTION_DIMENSION_GROUPER_H_ 55