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