Initial steps towards cleaning up integer arithmetic IR.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 5127 matching lines @@
   }
   virtual bool Equals(const Instance& other) const;
 
   virtual RawObject* HashCode() const { return raw(); }
 
   virtual bool IsZero() const;
   virtual bool IsNegative() const;
 
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
+  virtual int64_t AsTruncatedInt64Value() const {
+    return AsInt64Value();
+  }
   virtual uint32_t AsTruncatedUint32Value() const;
 
   virtual bool FitsIntoSmi() const;
 
   // Returns 0, -1 or 1.
   virtual int CompareWith(const Integer& other) const;
 
   // Return the most compact presentation of an integer.
   RawInteger* AsValidInteger() const;
 
@@ skipping 145 matching lines @@
 
 
 class Bigint : public Integer {
  public:
   virtual bool IsZero() const { return Used() == 0;}
   virtual bool IsNegative() const { return Neg(); }
   virtual bool Equals(const Instance& other) const;
 
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
+  virtual int64_t AsTruncatedInt64Value() const;
   virtual uint32_t AsTruncatedUint32Value() const;
 
   virtual int CompareWith(const Integer& other) const;
 
   virtual bool CheckAndCanonicalizeFields(const char** error_str) const;
 
   virtual bool FitsIntoSmi() const;
   bool FitsIntoInt64() const;
   bool FitsIntoUint64() const;
   uint64_t AsUint64Value() const;
@@ skipping 2129 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_