| // Copyright (c) 2019 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "source/reduce/simple_conditional_branch_to_branch_opportunity_finder.h" |
| |
| #include "source/reduce/reduction_util.h" |
| #include "source/reduce/simple_conditional_branch_to_branch_reduction_opportunity.h" |
| |
| namespace spvtools { |
| namespace reduce { |
| |
| std::vector<std::unique_ptr<ReductionOpportunity>> |
| SimpleConditionalBranchToBranchOpportunityFinder::GetAvailableOpportunities( |
| opt::IRContext* context, uint32_t target_function) const { |
| std::vector<std::unique_ptr<ReductionOpportunity>> result; |
| |
| // Consider every function. |
| for (auto* function : GetTargetFunctions(context, target_function)) { |
| // Consider every block in the function. |
| for (auto& block : *function) { |
| // The terminator must be SpvOpBranchConditional. |
| opt::Instruction* terminator = block.terminator(); |
| if (terminator->opcode() != SpvOpBranchConditional) { |
| continue; |
| } |
| // It must not be a selection header, as these cannot be followed by |
| // OpBranch. |
| if (block.GetMergeInst() && |
| block.GetMergeInst()->opcode() == SpvOpSelectionMerge) { |
| continue; |
| } |
| // The conditional branch must be simplified. |
| if (terminator->GetSingleWordInOperand(kTrueBranchOperandIndex) != |
| terminator->GetSingleWordInOperand(kFalseBranchOperandIndex)) { |
| continue; |
| } |
| |
| result.push_back( |
| MakeUnique<SimpleConditionalBranchToBranchReductionOpportunity>( |
| block.terminator())); |
| } |
| } |
| return result; |
| } |
| |
| std::string SimpleConditionalBranchToBranchOpportunityFinder::GetName() const { |
| return "SimpleConditionalBranchToBranchOpportunityFinder"; |
| } |
| |
| } // namespace reduce |
| } // namespace spvtools |