| // Copyright (c) 2022 The Khronos Group Inc. |
| // Copyright (c) 2022 LunarG 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. |
| |
| #ifndef SOURCE_OPT_ELIMINATE_DEAD_OUTPUT_STORES_H_ |
| #define SOURCE_OPT_ELIMINATE_DEAD_OUTPUT_STORES_H_ |
| |
| #include <unordered_set> |
| |
| #include "source/opt/ir_context.h" |
| #include "source/opt/module.h" |
| #include "source/opt/pass.h" |
| |
| namespace spvtools { |
| namespace opt { |
| |
| // See optimizer.hpp for documentation. |
| class EliminateDeadOutputStoresPass : public Pass { |
| public: |
| explicit EliminateDeadOutputStoresPass( |
| std::unordered_set<uint32_t>* live_locs, |
| std::unordered_set<uint32_t>* live_builtins) |
| : live_locs_(live_locs), live_builtins_(live_builtins) {} |
| |
| const char* name() const override { return "eliminate-dead-output-stores"; } |
| Status Process() override; |
| |
| // Return the mask of preserved Analyses. |
| IRContext::Analysis GetPreservedAnalyses() override { |
| return IRContext::kAnalysisDefUse | |
| IRContext::kAnalysisInstrToBlockMapping | |
| IRContext::kAnalysisCombinators | IRContext::kAnalysisCFG | |
| IRContext::kAnalysisDominatorAnalysis | |
| IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap | |
| IRContext::kAnalysisConstants | IRContext::kAnalysisTypes; |
| } |
| |
| private: |
| // Initialize elimination |
| void InitializeElimination(); |
| |
| // Do dead output store analysis |
| Status DoDeadOutputStoreElimination(); |
| |
| // Kill all stores resulting from |ref|. |
| void KillAllStoresOfRef(Instruction* ref); |
| |
| // Kill all dead stores resulting from |user| of loc-based |var|. |
| void KillAllDeadStoresOfLocRef(Instruction* user, Instruction* var); |
| |
| // Kill all dead stores resulting from |user| of builtin |var|. |
| void KillAllDeadStoresOfBuiltinRef(Instruction* user, Instruction* var); |
| |
| // Return true if any of |count| locations starting at location |start| are |
| // live. |
| bool AnyLocsAreLive(uint32_t start, uint32_t count); |
| |
| // Return true if builtin |bi| is live. |
| bool IsLiveBuiltin(uint32_t bi); |
| |
| std::unordered_set<uint32_t>* live_locs_; |
| std::unordered_set<uint32_t>* live_builtins_; |
| |
| std::vector<Instruction*> kill_list_; |
| }; |
| |
| } // namespace opt |
| } // namespace spvtools |
| |
| #endif // SOURCE_OPT_ELIMINATE_DEAD_OUTPUT_STORES_H_ |