mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
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// Copyright (c) 2019 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_BLOCK_REDUCTION_OPPORTUNITY_FINDER_H_
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#define SOURCE_REDUCE_REMOVE_BLOCK_REDUCTION_OPPORTUNITY_FINDER_H_
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#include "source/opt/function.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 of opportunities to remove a block. The optimizer can remove dead
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// code. However, the reducer needs to be able to remove at a fine-grained
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// level.
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class RemoveBlockReductionOpportunityFinder
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: public ReductionOpportunityFinder {
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public:
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RemoveBlockReductionOpportunityFinder() = default;
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~RemoveBlockReductionOpportunityFinder() 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) const final;
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private:
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// Returns true if the block |bi| in function |function| is a valid
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// opportunity according to various restrictions.
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static bool IsBlockValidOpportunity(opt::IRContext* context,
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opt::Function& function,
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opt::Function::iterator& bi);
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// Returns true if the instructions (definitions) in block |bi| have no
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// references, except for references from inside the block itself.
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static bool BlockInstructionsHaveNoOutsideReferences(
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opt::IRContext* context, const opt::Function::iterator& bi);
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};
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} // namespace reduce
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} // namespace spvtools
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#endif // SOURCE_REDUCE_REMOVE_BLOCK_REDUCTION_OPPORTUNITY_FINDER_H_
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