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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_SIMPLIFY_CONDITIONAL_BRANCH_REDUCTION_OPPORTUNITY_H_
#define SOURCE_REDUCE_SIMPLIFY_CONDITIONAL_BRANCH_REDUCTION_OPPORTUNITY_H_
#include "source/opt/basic_block.h"
#include "source/reduce/reduction_opportunity.h"
namespace spvtools {
namespace reduce {
// An opportunity to simplify a conditional branch to a simple conditional
// branch (a conditional branch with one target).
class ConditionalBranchToSimpleConditionalBranchReductionOpportunity
: public ReductionOpportunity {
public:
// Constructs an opportunity to simplify |conditional_branch_instruction|. If
// |redirect_to_true| is true, the false target will be changed to also point
// to the true target; otherwise, the true target will be changed to also
// point to the false target.
explicit ConditionalBranchToSimpleConditionalBranchReductionOpportunity(
opt::IRContext* context, opt::Instruction* conditional_branch_instruction,
bool redirect_to_true);
bool PreconditionHolds() override;
protected:
void Apply() override;
private:
opt::IRContext* context_;
opt::Instruction* conditional_branch_instruction_;
// If true, the false target will be changed to point to the true target;
// otherwise, the true target will be changed to point to the false target.
bool redirect_to_true_;
};
} // namespace reduce
} // namespace spvtools
#endif // SOURCE_REDUCE_SIMPLIFY_CONDITIONAL_BRANCH_REDUCTION_OPPORTUNITY_H_
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