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9d1b572884
This adds the --eliminate-dead-input-components pass which currently removes trailing unused components from input arrays. Fixes #4532
60 lines
2.1 KiB
C++
60 lines
2.1 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() {}
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const char* name() const override { return "reduce-load-size"; }
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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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};
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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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