1 /*
2  * Copyright (C) 2014 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_INSTRUCTION_SIMPLIFIER_H_
18 #define ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_H_
19 
20 #include "nodes.h"
21 #include "optimization.h"
22 #include "optimizing_compiler_stats.h"
23 
24 namespace art {
25 
26 class CodeGenerator;
27 
28 /**
29  * Implements optimizations specific to each instruction.
30  *
31  * Note that graph simplifications producing a constant should be
32  * implemented in art::HConstantFolding, while graph simplifications
33  * not producing constants should be implemented in
34  * art::InstructionSimplifier.  (This convention is a choice that was
35  * made during the development of these parts of the compiler and is
36  * not bound by any technical requirement.)
37  */
38 class InstructionSimplifier : public HOptimization {
39  public:
40   InstructionSimplifier(HGraph* graph,
41                         CodeGenerator* codegen,
42                         OptimizingCompilerStats* stats = nullptr,
43                         const char* name = kInstructionSimplifierPassName,
44                         bool use_all_optimizations = false)
HOptimization(graph,name,stats)45       : HOptimization(graph, name, stats),
46         codegen_(codegen),
47         use_all_optimizations_(use_all_optimizations) {}
48 
49   static constexpr const char* kInstructionSimplifierPassName = "instruction_simplifier";
50 
51   bool Run() override;
52 
53  private:
54   CodeGenerator* codegen_;
55 
56   // Use all optimizations without restrictions.
57   bool use_all_optimizations_;
58 
59   DISALLOW_COPY_AND_ASSIGN(InstructionSimplifier);
60 };
61 
62 }  // namespace art
63 
64 #endif  // ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_H_
65