Equality can be converted to a strict equality with checks. If the number of checks exceeds the thr…

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, 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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 2812 matching lines @@
 
 class EqualityCompareInstr : public ComparisonInstr {
  public:
   EqualityCompareInstr(intptr_t token_pos,
                        Token::Kind kind,
                        Value* left,
                        Value* right,
                        const Array& ic_data_array)
       : ComparisonInstr(token_pos, kind, left, right),
         ic_data_(GetICData(ic_data_array)),
+        unary_ic_data_(NULL),
         receiver_class_id_(kIllegalCid) {
     ASSERT((kind == Token::kEQ) || (kind == Token::kNE));
+    if (HasICData()) {
+      unary_ic_data_ = &ICData::ZoneHandle(ic_data_->AsUnaryClassChecks());
+    }
   }
 
   DECLARE_INSTRUCTION(EqualityCompare)
   virtual CompileType ComputeType() const;
   virtual bool RecomputeType();
 
   const ICData* ic_data() const { return ic_data_; }
   bool HasICData() const {
     return (ic_data() != NULL) && !ic_data()->IsNull();
   }
   void set_ic_data(const ICData* value) { ic_data_ = value; }
 
   // Receiver class id is computed from collected ICData.
   void set_receiver_class_id(intptr_t value) { receiver_class_id_ = value; }
   intptr_t receiver_class_id() const { return receiver_class_id_; }
 
   bool IsInlinedNumericComparison() const {
     return (receiver_class_id() == kDoubleCid)
         || (receiver_class_id() == kMintCid)
         || (receiver_class_id() == kSmiCid);
   }
 
-  bool is_checked_strict_equal() const {
-    return HasICData() && ic_data()->AllTargetsHaveSameOwner(kInstanceCid);
-  }
+  bool IsCheckedStrictEqual() const;
 
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
   virtual bool CanDeoptimize() const {
     return !IsInlinedNumericComparison();
   }
 
   virtual void EmitBranchCode(FlowGraphCompiler* compiler,
                               BranchInstr* branch);
 
   virtual intptr_t DeoptimizationTarget() const {
     return GetDeoptId();
   }
 
   virtual Representation RequiredInputRepresentation(intptr_t idx) const {
     ASSERT((idx == 0) || (idx == 1));
     if (receiver_class_id() == kDoubleCid) return kUnboxedDouble;
     if (receiver_class_id() == kMintCid) return kUnboxedMint;
     return kTagged;
   }
 
   bool IsPolymorphic() const;
 
   virtual EffectSet Effects() const {
     return IsInlinedNumericComparison() ? EffectSet::None() : EffectSet::All();
   }
 
   virtual bool MayThrow() const {
-    return !IsInlinedNumericComparison() && !is_checked_strict_equal();
+    return !IsInlinedNumericComparison() && !IsCheckedStrictEqual();
   }
 
  private:
   const ICData* ic_data_;
+  ICData* unary_ic_data_;
   intptr_t receiver_class_id_;  // Set by optimizer.
 
   DISALLOW_COPY_AND_ASSIGN(EqualityCompareInstr);
 };
 
 
 class RelationalOpInstr : public ComparisonInstr {
  public:
   RelationalOpInstr(intptr_t token_pos,
                     Token::Kind kind,
@@ skipping 3561 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_