SPIRV-Tools/source/reduce/remove_selection_reduction_opportunity_finder.h

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// Copyright (c) 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_FINDER_H_
#define SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_FINDER_H_
#include "source/reduce/reduction_opportunity_finder.h"
namespace spvtools {
namespace reduce {
// A finder for opportunities for removing a selection construct by simply
// removing the OpSelectionMerge instruction; thus, the selections must have
// already been simplified to a point where they can be trivially removed.
class RemoveSelectionReductionOpportunityFinder
: public ReductionOpportunityFinder {
public:
RemoveSelectionReductionOpportunityFinder() = default;
~RemoveSelectionReductionOpportunityFinder() override = default;
std::string GetName() const final;
std::vector<std::unique_ptr<ReductionOpportunity>> GetAvailableOpportunities(
opt::IRContext* context) const final;
// Returns true if the OpSelectionMerge instruction |merge_instruction| in
// block |header_block| can be removed.
static bool CanOpSelectionMergeBeRemoved(
opt::IRContext* context, const opt::BasicBlock& header_block,
opt::Instruction* merge_instruction,
std::unordered_set<uint32_t> merge_and_continue_blocks_from_loops);
};
} // namespace reduce
} // namespace spvtools
#endif // SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_FINDER_H_