62 строки
2.6 KiB
C++
62 строки
2.6 KiB
C++
// Copyright (c) 2018 Google LLC
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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_REDUCE_REMOVE_UNREFERENCED_INSTRUCTION_REDUCTION_OPPORTUNITY_FINDER_H_
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#define SOURCE_REDUCE_REMOVE_UNREFERENCED_INSTRUCTION_REDUCTION_OPPORTUNITY_FINDER_H_
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#include "source/reduce/reduction_opportunity_finder.h"
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namespace spvtools {
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namespace reduce {
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// A finder for opportunities to remove non-control-flow instructions in blocks
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// in cases where the instruction's id is either not referenced at all, or
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// referenced only in a trivial manner (for example, we regard a struct type as
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// unused if it is referenced only by struct layout decorations). As well as
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// making the module smaller, removing an instruction that references particular
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// ids may create opportunities for subsequently removing the instructions that
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// generated those ids.
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class RemoveUnusedInstructionReductionOpportunityFinder
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: public ReductionOpportunityFinder {
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public:
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explicit RemoveUnusedInstructionReductionOpportunityFinder(
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bool remove_constants_and_undefs);
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~RemoveUnusedInstructionReductionOpportunityFinder() override = default;
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std::string GetName() const final;
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std::vector<std::unique_ptr<ReductionOpportunity>> GetAvailableOpportunities(
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opt::IRContext* context, uint32_t target_function) const final;
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private:
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// Returns true if and only if the only uses of |inst| are by decorations that
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// relate intimately to the instruction (as opposed to decorations that could
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// be removed independently), or by interface ids in OpEntryPoint.
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bool OnlyReferencedByIntimateDecorationOrEntryPointInterface(
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opt::IRContext* context, const opt::Instruction& inst) const;
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// Returns true if and only if |inst| is a decoration instruction that can
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// legitimately be removed on its own (rather than one that has to be removed
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// simultaneously with other instructions).
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bool IsIndependentlyRemovableDecoration(const opt::Instruction& inst) const;
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bool remove_constants_and_undefs_;
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};
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} // namespace reduce
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} // namespace spvtools
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#endif // SOURCE_REDUCE_REMOVE_UNREFERENCED_INSTRUCTION_REDUCTION_OPPORTUNITY_FINDER_H_
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