| // 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_INPUT_COMPONENTS_H_ |
| #define SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_H_ |
| |
| #include <unordered_map> |
| |
| #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 EliminateDeadInputComponentsPass : public Pass { |
| public: |
| explicit EliminateDeadInputComponentsPass(bool output_instead = false, |
| bool vertex_shader_only = true) |
| : output_instead_(output_instead), |
| vertex_shader_only_(vertex_shader_only) {} |
| |
| const char* name() const override { |
| return "eliminate-dead-input-components"; |
| } |
| 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: |
| // Find the max constant used to index the variable declared by |var| |
| // through OpAccessChain or OpInBoundsAccessChain. If any non-constant |
| // indices or non-Op*AccessChain use of |var|, return |original_max|. |
| unsigned FindMaxIndex(Instruction& var, unsigned original_max); |
| |
| // Change the length of the array |inst| to |length| |
| void ChangeArrayLength(Instruction& inst, unsigned length); |
| |
| // Change the length of the struct |struct_var| to |length| |
| void ChangeStructLength(Instruction& struct_var, unsigned length); |
| |
| // Process output variables instead |
| bool output_instead_; |
| |
| // Only process vertex shaders |
| bool vertex_shader_only_; |
| }; |
| |
| } // namespace opt |
| } // namespace spvtools |
| |
| #endif // SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_H_ |