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https://github.com/KhronosGroup/SPIRV-Tools
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c2013e248b
Currently it is impossible to invalidate the constnat and type manager. However, the compact ids pass changes the ids for the types and constants, which makes them invalid. This change will make them analyses that have to been explicitly marked as preserved by passes. This will allow compact ids to invalidate them. Fixes #2220.
91 lines
3.3 KiB
C++
91 lines
3.3 KiB
C++
// Copyright (c) 2018 The Khronos Group Inc.
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// Copyright (c) 2018 Valve Corporation
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// Copyright (c) 2018 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_DEAD_INSERT_ELIM_PASS_H_
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#define SOURCE_OPT_DEAD_INSERT_ELIM_PASS_H_
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#include <algorithm>
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#include <map>
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#include <unordered_map>
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#include <unordered_set>
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#include <utility>
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#include <vector>
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#include "source/opt/basic_block.h"
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#include "source/opt/def_use_manager.h"
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#include "source/opt/ir_context.h"
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#include "source/opt/mem_pass.h"
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#include "source/opt/module.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 DeadInsertElimPass : public MemPass {
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public:
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DeadInsertElimPass() = default;
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const char* name() const override { return "eliminate-dead-inserts"; }
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Status Process() override;
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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::kAnalysisDecorations | IRContext::kAnalysisCombinators |
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IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisNameMap | IRContext::kAnalysisConstants |
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IRContext::kAnalysisTypes;
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}
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private:
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// Return the number of subcomponents in the composite type |typeId|.
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// Return 0 if not a composite type or number of components is not a
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// 32-bit constant.
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uint32_t NumComponents(Instruction* typeInst);
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// Mark all inserts in instruction chain ending at |insertChain| with
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// indices that intersect with extract indices |extIndices| starting with
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// index at |extOffset|. Chains are composed solely of Inserts and Phis.
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// Mark all inserts in chain if |extIndices| is nullptr.
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void MarkInsertChain(Instruction* insertChain,
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std::vector<uint32_t>* extIndices, uint32_t extOffset,
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std::unordered_set<uint32_t>* visited_phis);
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// Perform EliminateDeadInsertsOnePass(|func|) until no modification is
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// made. Return true if modified.
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bool EliminateDeadInserts(Function* func);
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// DCE all dead struct, matrix and vector inserts in |func|. An insert is
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// dead if the value it inserts is never used. Replace any reference to the
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// insert with its original composite. Return true if modified. Dead inserts
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// in dependence cycles are not currently eliminated. Dead inserts into
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// arrays are not currently eliminated.
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bool EliminateDeadInsertsOnePass(Function* func);
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// Return true if all extensions in this module are allowed by this pass.
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bool AllExtensionsSupported() const;
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// Live inserts
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std::unordered_set<uint32_t> liveInserts_;
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// Visited phis as insert chain is traversed; used to avoid infinite loop
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std::unordered_map<uint32_t, bool> visitedPhis_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_DEAD_INSERT_ELIM_PASS_H_
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