1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_COMPILER_OPTIMIZING_CODE_SINKING_H_
18 #define ART_COMPILER_OPTIMIZING_CODE_SINKING_H_
19 
20 #include "nodes.h"
21 #include "optimization.h"
22 
23 namespace art {
24 
25 /**
26  * Optimization pass to move instructions into uncommon branches,
27  * when it is safe to do so.
28  */
29 class CodeSinking : public HOptimization {
30  public:
CodeSinking(HGraph * graph,OptimizingCompilerStats * stats)31   CodeSinking(HGraph* graph, OptimizingCompilerStats* stats)
32       : HOptimization(graph, kCodeSinkingPassName, stats) {}
33 
34   void Run() OVERRIDE;
35 
36   static constexpr const char* kCodeSinkingPassName = "code_sinking";
37 
38  private:
39   // Try to move code only used by `end_block` and all its post-dominated / dominated
40   // blocks, to these blocks.
41   void SinkCodeToUncommonBranch(HBasicBlock* end_block);
42 
43   DISALLOW_COPY_AND_ASSIGN(CodeSinking);
44 };
45 
46 }  // namespace art
47 
48 #endif  // ART_COMPILER_OPTIMIZING_CODE_SINKING_H_
49