Optimize equality for case when all targets are Object.equals.

runtime/vm/intermediate_language.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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 668 matching lines @@
 class EqualityCompareComp : public ComparisonComp {
  public:
   EqualityCompareComp(intptr_t token_pos,
                       intptr_t try_index,
                       Token::Kind kind,
                       Value* left,
                       Value* right)
       : ComparisonComp(kind, left, right),
         token_pos_(token_pos),
         try_index_(try_index),
-        receiver_class_id_(kObjectCid) {
+        receiver_class_id_(kIllegalCid) {
     ASSERT((kind == Token::kEQ) || (kind == Token::kNE));
   }
 
   DECLARE_COMPUTATION(EqualityCompare)
 
   intptr_t token_pos() const { return token_pos_; }
   intptr_t try_index() const { return try_index_; }
 
+  // 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_; }
+
   virtual void PrintOperandsTo(BufferFormatter* f) const;
 
   virtual bool CanDeoptimize() const { return true; }
 
  private:
   const intptr_t token_pos_;
   const intptr_t try_index_;
   intptr_t receiver_class_id_;  // Set by optimizer.
 
   DISALLOW_COPY_AND_ASSIGN(EqualityCompareComp);
 };
 
 
 class RelationalOpComp : public ComparisonComp {
  public:
   RelationalOpComp(intptr_t token_pos,
                    intptr_t try_index,
                    Token::Kind kind,
                    Value* left,
                    Value* right)
       : ComparisonComp(kind, left, right),
         token_pos_(token_pos),
         try_index_(try_index),
-        operands_class_id_(kObjectCid) {
+        operands_class_id_(kIllegalCid) {
     ASSERT(Token::IsRelationalOperator(kind));
   }
 
   DECLARE_COMPUTATION(RelationalOp)
 
   intptr_t token_pos() const { return token_pos_; }
   intptr_t try_index() const { return try_index_; }
 
   // TODO(srdjan): instead of class-id pass an enum that can differentiate
   // between boxed and unboxed doubles and integers.
@@ skipping 2171 matching lines @@
   const GrowableArray<BlockEntryInstr*>& block_order_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_