diff -r 387d76b1e981 -r 10936f3a2ba3 src/BytecodeCompiler.cpp
--- a/src/BytecodeCompiler.cpp	Sat Sep 15 17:39:45 2012 -0700
+++ b/src/BytecodeCompiler.cpp	Sat Sep 15 18:25:54 2012 -0700
@@ -783,10 +783,17 @@
     if (type->isArray()) {
         Local<ArrayMap> map(zone_, ArrayMap::Attach(zone_, type));
         __ note_position(node->pos());
+
+        Opcode op;
+        if (type->isFixedLength())
+            op = OP_NEWFIXED;
+        else
+            op = OP_NEWEMPTY;
+
         if (var->scope()->kind() == Scope::GLOBAL)
-            __ newarray(map, Heap::Tenure_Old);
+            __ newarray(op, map, Heap::Tenure_Old);
         else
-            __ newarray(map, Heap::Tenure_Default);
+            __ newarray(op, map, Heap::Tenure_Default);
 
         if (node->initialization()) {
             node->initialization()->accept(this);
@@ -929,9 +936,9 @@
                 // Natives cannot escape array references, so we can allocate
                 // them on the LIFO stack.
                 if (funType->isNative())
-                    __ newarray(map, Heap::Tenure_Stack);
+                    __ newarray(OP_NEWFIXED, map, Heap::Tenure_Stack);
                 else
-                    __ newarray(map, Heap::Tenure_Default);
+                    __ newarray(OP_NEWFIXED, map, Heap::Tenure_Default);
                 __ dup();
                 __ object(array);
                 __ copyarray();