| // Copyright (c) 2018 Google Inc. |
| // |
| // 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/remove_unreferenced_instruction_reduction_opportunity_finder.h" |
| |
| #include "source/opcode.h" |
| #include "source/opt/instruction.h" |
| #include "source/reduce/remove_instruction_reduction_opportunity.h" |
| |
| namespace spvtools { |
| namespace reduce { |
| |
| using opt::IRContext; |
| |
| std::vector<std::unique_ptr<ReductionOpportunity>> |
| RemoveUnreferencedInstructionReductionOpportunityFinder:: |
| GetAvailableOpportunities(IRContext* context) const { |
| std::vector<std::unique_ptr<ReductionOpportunity>> result; |
| |
| for (auto& function : *context->module()) { |
| for (auto& block : function) { |
| for (auto& inst : block) { |
| if (context->get_def_use_mgr()->NumUses(&inst) > 0) { |
| continue; |
| } |
| if (spvOpcodeIsBlockTerminator(inst.opcode()) || |
| inst.opcode() == SpvOpSelectionMerge || |
| inst.opcode() == SpvOpLoopMerge) { |
| // In this reduction pass we do not want to affect static control |
| // flow. |
| continue; |
| } |
| // Given that we're in a block, we should only get here if the |
| // instruction is not directly related to control flow; i.e., it's |
| // some straightforward instruction with an unused result, like an |
| // arithmetic operation or function call. |
| result.push_back( |
| MakeUnique<RemoveInstructionReductionOpportunity>(&inst)); |
| } |
| } |
| } |
| return result; |
| } |
| |
| std::string RemoveUnreferencedInstructionReductionOpportunityFinder::GetName() |
| const { |
| return "RemoveUnreferencedInstructionReductionOpportunityFinder"; |
| } |
| |
| } // namespace reduce |
| } // namespace spvtools |