Manually inline fixed-size list's forEach, to make it possible for the VM to optimize.

runtime/vm/method_recognizer.h

 // Copyright (c) 2014, 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_METHOD_RECOGNIZER_H_
 #define VM_METHOD_RECOGNIZER_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
@@ skipping 272 matching lines @@
   PROFILER_LIB_INTRINSIC_LIST(V)
 
 #define RECOGNIZED_LIST(V)                                                     \
   OTHER_RECOGNIZED_LIST(V)                                                     \
   ALL_INTRINSICS_LIST(V)
 
 // A list of core function that should always be inlined.
 #define INLINE_WHITE_LIST(V)                                                   \
   V(Object, ==, ObjectEquals, 1068471689)                                      \
   V(_List, get:length, ObjectArrayLength, 1181352729)                          \
   V(_ImmutableList, get:length, ImmutableArrayLength, 274917727)               \

[Vyacheslav Egorov (Google), 2014/08/28 14:35:23]

Which iterator is used for _ImmutableList?

Maybe we should white list / duplicate something there as well.

[Anders Johnsen, 2014/08/28 14:45:57]

Same iterator (_FixedSizeArrayIterator). Added _ImmutableList forEach/iterator
as well.

   V(_TypedList, get:length, TypedDataLength, 522565357)                        \
   V(_GrowableList, get:length, GrowableArrayLength, 778505107)                 \
   V(_StringBase, get:length, StringBaseLength, 784399628)                      \
   V(ListIterator, moveNext, ListIteratorMoveNext, 210829138)                   \
+  V(_FixedSizeArrayIterator, moveNext, FixedListIteratorMoveNext, 1147271335)  \
   V(_GrowableList, get:iterator, GrowableArrayIterator, 1812933946)            \
   V(_GrowableList, forEach, GrowableArrayForEach, 2085943947)                  \
   V(_List, ., ObjectArrayAllocate, 1595327584)                                 \
   V(_List, [], ObjectArrayGetIndexed, 795612476)                               \
   V(_List, []=, ObjectArraySetIndexed, 1288827575)                             \
   V(_List, get:isEmpty, ObjectArrayIsEmpty, 2130247737)                        \
+  V(_List, get:iterator, ObjectArrayIterator, 458612415)                       \
+  V(_List, forEach, ObjectArrayForEach, 592525445)                             \
   V(_ImmutableList, [], ImmutableArrayGetIndexed, 1990177341)                  \
   V(_GrowableList, [], GrowableArrayGetIndexed, 919108233)                     \
   V(_GrowableList, []=, GrowableArraySetIndexed, 1218649853)                   \
   V(_Float32Array, [], Float32ArrayGetIndexed, 856653338)                      \
   V(_Float32Array, []=, Float32ArraySetIndexed, 2086166464)                    \
   V(_Float64Array, [], Float64ArrayGetIndexed, 1779054297)                     \
   V(_Float64Array, []=, Float64ArraySetIndexed, 243929230)                     \
   V(_Int8Array, [], Int8ArrayGetIndexed, 321230586)                            \
   V(_Int8Array, []=, Int8ArraySetIndexed, 2050598685)                          \
   V(_Uint8Array, [], Uint8ArrayGetIndexed, 16125140)                           \
@@ skipping 70 matching lines @@
   static Kind RecognizeKind(const Function& function);
   static bool AlwaysInline(const Function& function);
   static bool PolymorphicTarget(const Function& function);
   static const char* KindToCString(Kind kind);
   static void InitializeState();
 };
 
 }  // namespace dart
 
 #endif  // VM_METHOD_RECOGNIZER_H_