mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
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// 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_OUTPUT_STORES_H_
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#define SOURCE_OPT_ELIMINATE_DEAD_OUTPUT_STORES_H_
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#include <unordered_set>
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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 EliminateDeadOutputStoresPass : public Pass {
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public:
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explicit EliminateDeadOutputStoresPass(
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std::unordered_set<uint32_t>* live_locs,
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std::unordered_set<uint32_t>* live_builtins)
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: live_locs_(live_locs), live_builtins_(live_builtins) {}
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const char* name() const override { return "eliminate-dead-output-stores"; }
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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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// Initialize elimination
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void InitializeElimination();
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// Do dead output store analysis
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Status DoDeadOutputStoreElimination();
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// Kill all stores resulting from |ref|.
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void KillAllStoresOfRef(Instruction* ref);
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// Kill all dead stores resulting from |user| of loc-based |var|.
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void KillAllDeadStoresOfLocRef(Instruction* user, Instruction* var);
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// Kill all dead stores resulting from |user| of builtin |var|.
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void KillAllDeadStoresOfBuiltinRef(Instruction* user, Instruction* var);
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// Return true if any of |count| locations starting at location |start| are
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// live.
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bool AnyLocsAreLive(uint32_t start, uint32_t count);
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// Return true if builtin |bi| is live.
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bool IsLiveBuiltin(uint32_t bi);
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std::unordered_set<uint32_t>* live_locs_;
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std::unordered_set<uint32_t>* live_builtins_;
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std::vector<Instruction*> kill_list_;
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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_OUTPUT_STORES_H_
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