Vector-ICs: Implement slot sharing for global loads.

src/ast-numbering.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/scopes.h"
 
 namespace v8 {
 namespace internal {
 
 
 class AstNumberingVisitor FINAL : public AstVisitor {
  public:
   explicit AstNumberingVisitor(Isolate* isolate, Zone* zone)
       : AstVisitor(),
         next_id_(BailoutId::FirstUsable().ToInt()),
+        ic_slot_cache_(FLAG_vector_ics ? 4 : 0),
         dont_optimize_reason_(kNoReason) {
     InitializeAstVisitor(isolate, zone);
   }
 
   bool Renumber(FunctionLiteral* node);
 
  private:
 // AST node visitor interface.
 #define DEFINE_VISIT(type) virtual void Visit##type(type* node) OVERRIDE;
   AST_NODE_LIST(DEFINE_VISIT)
@@ skipping 22 matching lines @@
   }
   void DisableCaching(BailoutReason reason) {
     dont_optimize_reason_ = reason;
     DisableSelfOptimization();
     properties_.flags()->Add(kDontCache);
   }
 
   template <typename Node>
   void ReserveFeedbackSlots(Node* node) {
     FeedbackVectorRequirements reqs =
-        node->ComputeFeedbackRequirements(isolate());
+        node->ComputeFeedbackRequirements(isolate(), &ic_slot_cache_);
     if (reqs.slots() > 0) {
       node->SetFirstFeedbackSlot(FeedbackVectorSlot(properties_.slots()));
       properties_.increase_slots(reqs.slots());
     }
     if (reqs.ic_slots() > 0) {
       int ic_slots = properties_.ic_slots();
-      node->SetFirstFeedbackICSlot(FeedbackVectorICSlot(ic_slots));
+      node->SetFirstFeedbackICSlot(FeedbackVectorICSlot(ic_slots),
+                                   &ic_slot_cache_);
       properties_.increase_ic_slots(reqs.ic_slots());
       if (FLAG_vector_ics) {
         for (int i = 0; i < reqs.ic_slots(); i++) {
           properties_.SetKind(ic_slots + i, node->FeedbackICSlotKind(i));
         }
       }
     }
   }
 
   BailoutReason dont_optimize_reason() const { return dont_optimize_reason_; }
 
   int next_id_;
   AstProperties properties_;
+  // The slot cache allows us to reuse certain vector IC slots. It's only used
+  // if FLAG_vector_ics is true.
+  ICSlotCache ic_slot_cache_;
   BailoutReason dont_optimize_reason_;
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
   DISALLOW_COPY_AND_ASSIGN(AstNumberingVisitor);
 };
 
 
 void AstNumberingVisitor::VisitVariableDeclaration(VariableDeclaration* node) {
   IncrementNodeCount();
   VisitVariableProxy(node->proxy());
@@ skipping 457 matching lines @@
 }
 
 
 bool AstNumbering::Renumber(Isolate* isolate, Zone* zone,
                             FunctionLiteral* function) {
   AstNumberingVisitor visitor(isolate, zone);
   return visitor.Renumber(function);
 }
 }
 }  // namespace v8::internal