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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 ART_COMPILER_OPTIMIZING_CODE_SINKING_H_
#define ART_COMPILER_OPTIMIZING_CODE_SINKING_H_
#include "base/macros.h"
#include "nodes.h"
#include "optimization.h"
namespace art HIDDEN {
/**
* Optimization pass to move instructions into uncommon branches,
* when it is safe to do so.
*/
class CodeSinking : public HOptimization {
public:
CodeSinking(HGraph* graph,
OptimizingCompilerStats* stats,
const char* name = kCodeSinkingPassName)
: HOptimization(graph, name, stats) {}
bool Run() override;
static constexpr const char* kCodeSinkingPassName = "code_sinking";
private:
// Tries to sink code to uncommon branches.
void UncommonBranchSinking();
// Tries to move code only used by `end_block` and all its post-dominated / dominated
// blocks, to these blocks.
void SinkCodeToUncommonBranch(HBasicBlock* end_block);
// Coalesces the Return/ReturnVoid instructions into one, if we have two or more. We do this to
// avoid generating the exit frame code several times.
void ReturnSinking();
DISALLOW_COPY_AND_ASSIGN(CodeSinking);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_CODE_SINKING_H_
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