1 // Copyright (c) 2019 Google LLC 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 SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_H_ 16 #define SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_H_ 17 18 #include "source/opt/basic_block.h" 19 #include "source/reduce/reduction_opportunity.h" 20 21 namespace spvtools { 22 namespace reduce { 23 24 // An opportunity for removing a selection construct by simply removing the 25 // OpSelectionMerge instruction; thus, the selection must have already been 26 // simplified to a point where the instruction can be trivially removed. 27 class RemoveSelectionReductionOpportunity : public ReductionOpportunity { 28 public: 29 // Constructs a reduction opportunity from the selection header |block| in 30 // |function|. RemoveSelectionReductionOpportunity(opt::BasicBlock * header_block)31 RemoveSelectionReductionOpportunity(opt::BasicBlock* header_block) 32 : header_block_(header_block) {} 33 34 bool PreconditionHolds() override; 35 36 protected: 37 void Apply() override; 38 39 private: 40 // The header block of the selection. 41 opt::BasicBlock* header_block_; 42 }; 43 44 } // namespace reduce 45 } // namespace spvtools 46 47 #endif // SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_H_ 48