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_OPERAND_TO_CONST_REDUCTION_PASS_H_ 16 #define SOURCE_REDUCE_OPERAND_TO_CONST_REDUCTION_PASS_H_ 17 18 #include "reduction_pass.h" 19 20 namespace spvtools { 21 namespace reduce { 22 23 // A reduction pass for turning id operands of instructions into ids of 24 // constants. This reduces the extent to which ids of non-constants are used, 25 // paving the way for instructions that generate them to be eliminated by other 26 // passes. 27 class OperandToConstReductionPass : public ReductionPass { 28 public: 29 // Creates the reduction pass in the context of the given target environment 30 // |target_env| OperandToConstReductionPass(const spv_target_env target_env)31 explicit OperandToConstReductionPass(const spv_target_env target_env) 32 : ReductionPass(target_env) {} 33 34 ~OperandToConstReductionPass() override = default; 35 36 // The name of this pass. 37 std::string GetName() const final; 38 39 protected: 40 // Finds all opportunities for replacing an operand with a constant in the 41 // given module. 42 std::vector<std::unique_ptr<ReductionOpportunity>> GetAvailableOpportunities( 43 opt::IRContext* context) const final; 44 45 private: 46 }; 47 48 } // namespace reduce 49 } // namespace spvtools 50 51 #endif // SOURCE_REDUCE_OPERAND_TO_CONST_REDUCTION_PASS_H_ 52