Optimize stores to ExternalUint8Array and ExternalUint8ClampedArray in the optimizer.

runtime/vm/flow_graph_optimizer.cc

 // 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.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
@@ skipping 585 matching lines @@
   switch (class_id) {
     case kArrayCid:
     case kGrowableObjectArrayCid:
       if (ArgIsAlwaysSmi(*call->ic_data(), 2)) {
         value_check = call->ic_data()->AsUnaryClassChecksForArgNr(2);
       }
       break;
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
+    case kExternalUint8ArrayCid:
+    case kExternalUint8ClampedArrayCid:
     case kInt16ArrayCid:
     case kUint16ArrayCid:
       // Check that value is always smi.
       value_check = call->ic_data()->AsUnaryClassChecksForArgNr(2);
       if ((value_check.NumberOfChecks() != 1) ||
           (value_check.GetReceiverClassIdAt(0) != kSmiCid)) {
         return false;
       }
       break;
     case kInt32ArrayCid:
@@ skipping 56 matching lines @@
                                type_arguments_field_offset,
                                Type::ZoneHandle());  // No type.
         InsertBefore(call, load_type_args, NULL, Definition::kValue);
         instantiator = array->Copy();
         type_args = new Value(load_type_args);
         break;
       }
       case kInt8ArrayCid:
       case kUint8ArrayCid:
       case kUint8ClampedArrayCid:
+      case kExternalUint8ArrayCid:
+      case kExternalUint8ClampedArrayCid:
       case kInt16ArrayCid:
       case kUint16ArrayCid:
       case kInt32ArrayCid:
       case kUint32ArrayCid:
         ASSERT(value_type.IsIntType());
         // Fall through.
       case kFloat32ArrayCid:
       case kFloat64ArrayCid: {
         instantiator = new Value(flow_graph_->constant_null());
         type_args = new Value(flow_graph_->constant_null());
@@ skipping 668 matching lines @@
   call->ReplaceWith(invoke, current_iterator());
   RemovePushArguments(call);
 }
 
 
 static bool IsSupportedByteArrayCid(intptr_t cid) {
   switch (cid) {
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
+    case kExternalUint8ArrayCid:
+    case kExternalUint8ClampedArrayCid:
     case kInt16ArrayCid:
     case kUint16ArrayCid:
     case kInt32ArrayCid:
     case kUint32ArrayCid:
     case kFloat32ArrayCid:
     case kFloat64ArrayCid:
       return true;
     default:
       return false;
   }
@@ skipping 3306 matching lines @@
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 
 }  // namespace dart