Do not issue Mint/Smi code sequence if we have only Smi/Smi comnbination.

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 1512 matching lines @@
   const LocalVariable& exception_var_;
   const LocalVariable& stacktrace_var_;
 
   DISALLOW_COPY_AND_ASSIGN(CatchEntryComp);
 };
 
 
 class BinaryOpComp : public TemplateComputation<2> {
  public:
   enum OperandsType {
+    kIllegalOperands,

[regis, 2012/06/22 20:50:12]

Would kUnrecognizedOperands or kDynamicOperands be a better name?

[srdjan, 2012/06/22 20:54:26]

kDynamicOperands

     kSmiOperands,
     kMintOperands,
     kDoubleOperands
   };
 
   BinaryOpComp(Token::Kind op_kind,
                OperandsType operands_type,
                InstanceCallComp* instance_call,
                Value* left,
                Value* right)
@@ skipping 886 matching lines @@
   const GrowableArray<BlockEntryInstr*>& block_order_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_