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// Copyright (c) 2018 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_OPT_LOOP_UNSWITCH_PASS_H_
#define SOURCE_OPT_LOOP_UNSWITCH_PASS_H_
#include "source/opt/loop_descriptor.h"
#include "source/opt/pass.h"
namespace spvtools {
namespace opt {
// Implements the loop unswitch optimization.
// The loop unswitch hoists invariant "if" statements if the conditions are
// constant within the loop and clones the loop for each branch.
class LoopUnswitchPass : public Pass {
public:
const char* name() const override { return "loop-unswitch"; }
// Processes the given |module|. Returns Status::Failure if errors occur when
// processing. Returns the corresponding Status::Success if processing is
// successful to indicate whether changes have been made to the module.
Pass::Status Process() override;
private:
bool ProcessFunction(Function* f);
};
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_LOOP_UNSWITCH_PASS_H_
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