1 // Copyright (c) 2018 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_UNREFERENCED_INSTRUCTION_REDUCTION_PASS_H_ 16 #define SOURCE_REDUCE_REMOVE_UNREFERENCED_INSTRUCTION_REDUCTION_PASS_H_ 17 18 #include "reduction_pass.h" 19 20 namespace spvtools { 21 namespace reduce { 22 23 // A reduction pass for removing non-control-flow instructions in blocks in 24 // cases where the instruction's id is not referenced. As well as making the 25 // module smaller, removing an instruction that referenced particular ids may 26 // create opportunities for subsequently removing the instructions that 27 // generated those ids. 28 class RemoveUnreferencedInstructionReductionPass : public ReductionPass { 29 public: 30 // Creates the reduction pass in the context of the given target environment 31 // |target_env| RemoveUnreferencedInstructionReductionPass(const spv_target_env target_env)32 explicit RemoveUnreferencedInstructionReductionPass( 33 const spv_target_env target_env) 34 : ReductionPass(target_env) {} 35 36 ~RemoveUnreferencedInstructionReductionPass() override = default; 37 38 // The name of this pass. 39 std::string GetName() const final; 40 41 protected: 42 // Finds all opportunities for removing unreferenced instructions in the 43 // given module. 44 std::vector<std::unique_ptr<ReductionOpportunity>> GetAvailableOpportunities( 45 opt::IRContext* context) const final; 46 47 private: 48 }; 49 50 } // namespace reduce 51 } // namespace spvtools 52 53 #endif // SOURCE_REDUCE_REMOVE_UNREFERENCED_INSTRUCTION_REDUCTION_PASS_H_ 54