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https://github.com/KhronosGroup/SPIRV-Tools
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525bc38062
This pass eliminates components of output variables that are not stored to. Currently this just eliminates trailing components of arrays and structs, all of which are dead. WARNING: This pass is not designed to be a standalone pass as it can cause interface incompatibiliies with the following shader in the pipeline. See the comment in optimizer.hpp for best usage. This pass is currently available only through the API; it is not available in the CLI. This commit also fixes a bug in CreateDecoration() which is part of the system of generating SPIR-V from the Type manager.
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
// Copyright (c) 2022 The Khronos Group Inc.
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// Copyright (c) 2022 LunarG Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_H_
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#define SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_H_
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#include <unordered_map>
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#include "source/opt/ir_context.h"
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#include "source/opt/module.h"
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#include "source/opt/pass.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class EliminateDeadInputComponentsPass : public Pass {
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public:
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explicit EliminateDeadInputComponentsPass(bool output_instead = false)
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: output_instead_(output_instead) {}
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const char* name() const override {
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return "eliminate-dead-input-components";
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}
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Status Process() override;
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// Return the mask of preserved Analyses.
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisDefUse |
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IRContext::kAnalysisInstrToBlockMapping |
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IRContext::kAnalysisCombinators | IRContext::kAnalysisCFG |
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IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |
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IRContext::kAnalysisConstants | IRContext::kAnalysisTypes;
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}
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private:
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// Find the max constant used to index the variable declared by |var|
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// through OpAccessChain or OpInBoundsAccessChain. If any non-constant
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// indices or non-Op*AccessChain use of |var|, return |original_max|.
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unsigned FindMaxIndex(Instruction& var, unsigned original_max);
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// Change the length of the array |inst| to |length|
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void ChangeArrayLength(Instruction& inst, unsigned length);
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// Change the length of the struct |struct_var| to |length|
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void ChangeStructLength(Instruction& struct_var, unsigned length);
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// Process output variables instead
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bool output_instead_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_H_
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