Unbox phis that were proven to be of type Double.

runtime/vm/flow_graph_optimizer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_FLOW_GRAPH_OPTIMIZER_H_
 #define VM_FLOW_GRAPH_OPTIMIZER_H_
 
 #include "vm/intermediate_language.h"
 #include "vm/flow_graph.h"
 
 namespace dart {
 
 template <typename T> class GrowableArray;
 template <typename T> class DirectChainedHashMap;
 
 class FlowGraphOptimizer : public FlowGraphVisitor {
  public:
   explicit FlowGraphOptimizer(FlowGraph* flow_graph)
       : FlowGraphVisitor(flow_graph->reverse_postorder()),
         flow_graph_(flow_graph) { }
   virtual ~FlowGraphOptimizer() {}
 
   void ApplyICData();
 
   void OptimizeComputations();
 
+  void EliminateDeadPhis();
+
+  void SelectRepresentations();
+
   virtual void VisitStaticCall(StaticCallComp* comp, BindInstr* instr);
   virtual void VisitInstanceCall(InstanceCallComp* comp, BindInstr* instr);
   virtual void VisitRelationalOp(RelationalOpComp* comp, BindInstr* instr);
   virtual void VisitEqualityCompare(EqualityCompareComp* comp,
                                     BindInstr* instr);
   virtual void VisitBind(BindInstr* instr);
   virtual void VisitBranch(BranchInstr* instr);
 
  private:
   bool TryReplaceWithArrayOp(BindInstr* instr,
@@ skipping 17 matching lines @@
   BindInstr* InsertBefore(Instruction* instr,
                           Computation* comp,
                           Environment* env,
                           BindInstr::UseKind use_kind);
 
   BindInstr* InsertAfter(Instruction* instr,
                          Computation* comp,
                          Environment* env,
                          BindInstr::UseKind use_kind);
 
+  void InsertConversionsFor(Definition* def);
+
   FlowGraph* flow_graph_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphOptimizer);
 };
 
 
 // Analyze the generated flow graph. Currently only if it is a leaf
 // method, i.e., does not contain any calls to runtime or other Dart code.
 class FlowGraphAnalyzer : public ValueObject {
  public:
@@ skipping 56 matching lines @@
  private:
   static void OptimizeRecursive(
       BlockEntryInstr* entry,
       DirectChainedHashMap<BindInstr*>* map);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_OPTIMIZER_H_