Eliminate bounds checks on fixed-length registers array.

runtime/vm/constant_propagator.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/constant_propagator.h"
 
 #include "vm/bit_vector.h"
 #include "vm/flow_graph_builder.h"
 #include "vm/flow_graph_compiler.h"
 #include "vm/flow_graph_range_analysis.h"
@@ skipping 785 matching lines @@
       if (constant->value().IsString()) {
         SetValue(instr, Smi::ZoneHandle(I,
             Smi::New(String::Cast(constant->value()).Length())));
         return;
       }
       if (constant->value().IsArray()) {
         SetValue(instr, Smi::ZoneHandle(I,
             Smi::New(Array::Cast(constant->value()).Length())));
         return;
       }
+      if (constant->value().IsTypedData()) {
+        SetValue(instr, Smi::ZoneHandle(I,
+            Smi::New(TypedData::Cast(constant->value()).Length())));
+        return;
+      }
     }
   }
   SetValue(instr, non_constant_);
 }
 
 
 void ConstantPropagator::VisitInstantiateType(InstantiateTypeInstr* instr) {
   const Object& object =
       instr->instantiator()->definition()->constant_value();
   if (IsNonConstant(object)) {
@@ skipping 813 matching lines @@
   graph_->ComputeDominators(&dominance_frontier);
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 }  // namespace dart