SPIRV-Tools/source/reduce/remove_selection_reduction_opportunity.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_H_
#define SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_H_
#include "source/opt/basic_block.h"
#include "source/reduce/reduction_opportunity.h"
namespace spvtools {
namespace reduce {
// An opportunity for removing a selection construct by simply removing the
// OpSelectionMerge instruction; thus, the selection must have already been
// simplified to a point where the instruction can be trivially removed.
class RemoveSelectionReductionOpportunity : public ReductionOpportunity {
public:
// Constructs a reduction opportunity from the selection header |block| in
// |function|.
RemoveSelectionReductionOpportunity(opt::BasicBlock* header_block)
: header_block_(header_block) {}
bool PreconditionHolds() override;
protected:
void Apply() override;
private:
// The header block of the selection.
opt::BasicBlock* header_block_;
};
} // namespace reduce
} // namespace spvtools
#endif // SOURCE_REDUCE_REMOVE_SELECTION_REDUCTION_OPPORTUNITY_H_