Add the native intrinsic TypedData_setRange to optimize the setRange call when the destination and …

runtime/lib/typeddata.dart

 // 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.
 
 // patch classes for Int8List ..... Float64List and ByteData implementations.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
@@ skipping 307 matching lines @@
   }
 
   int elementAt(int index) {
     return this[index];
   }
 
   bool get isEmpty {
     return this.length == 0;
   }
 
+
   // Method(s) implementing the List interface.
 
   set length(newLength) {
     throw new UnsupportedError(
         "Cannot resize a non-extendable array");
   }
 
   void add(value) {
     throw new UnsupportedError(
         "Cannot add to a non-extendable array");
@@ skipping 97 matching lines @@
   }
 
   List getRange(int start, int length) {
     _rangeCheck(this.length, start, length);
     List result = _createList(length);
     result.setRange(0, length, this, start);
     return result;
   }
 
   void setRange(int start, int length, List from, [int startFrom = 0]) {
-    IterableMixinWorkaround.setRangeList(this, start, length, from, startFrom);
+    if (!_setRange(start, length, from, startFrom)) {
+      IterableMixinWorkaround.setRangeList(this, start,
+                                           length, from, startFrom);
+    }
   }
 
+
   // Method(s) implementing Object interface.
 
   String toString() {
     return Collections.collectionToString(this);
   }
+
+
+  // Internal utility methods.
+
+  bool _setRange(int start, int length, List from, startFrom)
+      native "TypedData_setRange";
 }
 
 
 abstract class _TypedList extends _TypedListBase implements ByteBuffer {
   // Default method implementing parts of the TypedData interface.
   int get offsetInBytes {
     return 0;
   }
 
   int get lengthInBytes {
@@ skipping 2148 matching lines @@
   }
 }
 
 
 int _defaultIfNull(object, value) {
   if (object == null) {
     return value;
   }
   return object;
 }