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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   void TryExtractArrayAccessAddress(HInstruction* access,
     39                                     HInstruction* array,
     40                                     HInstruction* index,
     41                                     int access_size);
     42   bool TryMergeIntoUsersShifterOperand(HInstruction* instruction);
     43   bool TryMergeIntoShifterOperand(HInstruction* use,
     44                                   HInstruction* bitfield_op,
     45                                   bool do_merge);
     46   bool CanMergeIntoShifterOperand(HInstruction* use, HInstruction* bitfield_op) {
     47     return TryMergeIntoShifterOperand(use, bitfield_op, false);
     48   }
     49   bool MergeIntoShifterOperand(HInstruction* use, HInstruction* bitfield_op) {
     50     DCHECK(CanMergeIntoShifterOperand(use, bitfield_op));
     51     return TryMergeIntoShifterOperand(use, bitfield_op, true);
     52   }
     53 
     54   /**
     55    * This simplifier uses a special-purpose BB visitor.
     56    * (1) No need to visit Phi nodes.
     57    * (2) Since statements can be removed in a "forward" fashion,
     58    *     the visitor should test if each statement is still there.
     59    */
     60   void VisitBasicBlock(HBasicBlock* block) OVERRIDE {
     61     // TODO: fragile iteration, provide more robust iterators?
     62     for (HInstructionIterator it(block->GetInstructions()); !it.Done(); it.Advance()) {
     63       HInstruction* instruction = it.Current();
     64       if (instruction->IsInBlock()) {
     65         instruction->Accept(this);
     66       }
     67     }
     68   }
     69 
     70   // HInstruction visitors, sorted alphabetically.
     71   void VisitAnd(HAnd* instruction) OVERRIDE;
     72   void VisitArrayGet(HArrayGet* instruction) OVERRIDE;
     73   void VisitArraySet(HArraySet* instruction) OVERRIDE;
     74   void VisitMul(HMul* instruction) OVERRIDE;
     75   void VisitOr(HOr* instruction) OVERRIDE;
     76   void VisitShl(HShl* instruction) OVERRIDE;
     77   void VisitShr(HShr* instruction) OVERRIDE;
     78   void VisitTypeConversion(HTypeConversion* instruction) OVERRIDE;
     79   void VisitUShr(HUShr* instruction) OVERRIDE;
     80   void VisitXor(HXor* instruction) OVERRIDE;
     81 
     82   OptimizingCompilerStats* stats_;
     83 };
     84 
     85 
     86 class InstructionSimplifierArm64 : public HOptimization {
     87  public:
     88   InstructionSimplifierArm64(HGraph* graph, OptimizingCompilerStats* stats)
     89     : HOptimization(graph, "instruction_simplifier_arm64", stats) {}
     90 
     91   void Run() OVERRIDE {
     92     InstructionSimplifierArm64Visitor visitor(graph_, stats_);
     93     visitor.VisitReversePostOrder();
     94   }
     95 };
     96 
     97 }  // namespace arm64
     98 }  // namespace art
     99 
    100 #endif  // ART_COMPILER_OPTIMIZING_INSTRUCTION_SIMPLIFIER_ARM64_H_
    101