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      1 /*
      2  * Copyright (C) 2015 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_ARM64_H_
     18 #define ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_ARM64_H_
     19 
     20 #include "nodes.h"
     21 #include "optimization.h"
     22 
     23 namespace art {
     24 namespace arm64 {
     25 
     26 class InstructionSimplifierArm64Visitor : public HGraphVisitor {
     27  public:
     28   InstructionSimplifierArm64Visitor(HGraph* graph, OptimizingCompilerStats* stats)
     29       : HGraphVisitor(graph), stats_(stats) {}
     30 
     31  private:
     32   void RecordSimplification() {
     33     if (stats_ != nullptr) {
     34       stats_->RecordStat(kInstructionSimplificationsArch);
     35     }
     36   }
     37 
     38   bool TryMergeIntoUsersShifterOperand(HInstruction* instruction);
     39   bool TryMergeIntoShifterOperand(HInstruction* use,
     40                                   HInstruction* bitfield_op,
     41                                   bool do_merge);
     42   bool CanMergeIntoShifterOperand(HInstruction* use, HInstruction* bitfield_op) {
     43     return TryMergeIntoShifterOperand(use, bitfield_op, /* do_merge */ false);
     44   }
     45   bool MergeIntoShifterOperand(HInstruction* use, HInstruction* bitfield_op) {
     46     DCHECK(CanMergeIntoShifterOperand(use, bitfield_op));
     47     return TryMergeIntoShifterOperand(use, bitfield_op, /* do_merge */ true);
     48   }
     49 
     50   /**
     51    * This simplifier uses a special-purpose BB visitor.
     52    * (1) No need to visit Phi nodes.
     53    * (2) Since statements can be removed in a "forward" fashion,
     54    *     the visitor should test if each statement is still there.
     55    */
     56   void VisitBasicBlock(HBasicBlock* block) OVERRIDE {
     57     // TODO: fragile iteration, provide more robust iterators?
     58     for (HInstructionIterator it(block->GetInstructions()); !it.Done(); it.Advance()) {
     59       HInstruction* instruction = it.Current();
     60       if (instruction->IsInBlock()) {
     61         instruction->Accept(this);
     62       }
     63     }
     64   }
     65 
     66   // HInstruction visitors, sorted alphabetically.
     67   void VisitAnd(HAnd* instruction) OVERRIDE;
     68   void VisitArrayGet(HArrayGet* instruction) OVERRIDE;
     69   void VisitArraySet(HArraySet* instruction) OVERRIDE;
     70   void VisitMul(HMul* instruction) OVERRIDE;
     71   void VisitOr(HOr* instruction) OVERRIDE;
     72   void VisitShl(HShl* instruction) OVERRIDE;
     73   void VisitShr(HShr* instruction) OVERRIDE;
     74   void VisitTypeConversion(HTypeConversion* instruction) OVERRIDE;
     75   void VisitUShr(HUShr* instruction) OVERRIDE;
     76   void VisitXor(HXor* instruction) OVERRIDE;
     77   void VisitVecMul(HVecMul* instruction) OVERRIDE;
     78 
     79   OptimizingCompilerStats* stats_;
     80 };
     81 
     82 
     83 class InstructionSimplifierArm64 : public HOptimization {
     84  public:
     85   InstructionSimplifierArm64(HGraph* graph, OptimizingCompilerStats* stats)
     86       : HOptimization(graph, kInstructionSimplifierArm64PassName, stats) {}
     87 
     88   static constexpr const char* kInstructionSimplifierArm64PassName = "instruction_simplifier_arm64";
     89 
     90   void Run() OVERRIDE {
     91     InstructionSimplifierArm64Visitor visitor(graph_, stats_);
     92     visitor.VisitReversePostOrder();
     93   }
     94 };
     95 
     96 }  // namespace arm64
     97 }  // namespace art
     98 
     99 #endif  // ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_ARM64_H_
    100