Optimize _getIndexed on byte arrays.

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 1372 matching lines @@
 
 
 // Inline only simple, frequently called core library methods.
 bool FlowGraphOptimizer::TryInlineInstanceMethod(InstanceCallInstr* call) {
   ASSERT(call->HasICData());
   const ICData& ic_data = *call->ic_data();
   if ((ic_data.NumberOfChecks() == 0) || !ic_data.HasOneTarget()) {
     // No type feedback collected or multiple targets found.
     return false;
   }
+
   Function& target = Function::Handle();
   GrowableArray<intptr_t> class_ids;
   ic_data.GetCheckAt(0, &class_ids, &target);
   MethodRecognizer::Kind recognized_kind =
       MethodRecognizer::RecognizeKind(target);
+
+  // Byte array access.
+  switch (recognized_kind) {
+    case MethodRecognizer::kFloat32ArrayGetIndexed:
+    case MethodRecognizer::kFloat64ArrayGetIndexed:
+    case MethodRecognizer::kInt8ArrayGetIndexed:
+    case MethodRecognizer::kUint8ArrayGetIndexed:
+    case MethodRecognizer::kUint8ClampedArrayGetIndexed:
+    case MethodRecognizer::kExternalUint8ArrayGetIndexed:
+    case MethodRecognizer::kExternalUint8ClampedArrayGetIndexed:
+    case MethodRecognizer::kInt16ArrayGetIndexed:
+    case MethodRecognizer::kUint16ArrayGetIndexed:
+    case MethodRecognizer::kInt32ArrayGetIndexed:
+    case MethodRecognizer::kUint32ArrayGetIndexed:
+      return TryReplaceWithLoadIndexed(call);
+    default:
+      break;
+  }
+
   if ((recognized_kind == MethodRecognizer::kStringBaseCharCodeAt) &&
       (ic_data.NumberOfChecks() == 1) &&
       ((class_ids[0] == kOneByteStringCid) ||
        (class_ids[0] == kTwoByteStringCid))) {
     LoadIndexedInstr* instr = BuildStringCharCodeAt(call, class_ids[0]);
     call->ReplaceWith(instr, current_iterator());
     RemovePushArguments(call);
     return true;
   }
   if ((recognized_kind == MethodRecognizer::kStringBaseCharAt) &&
@@ skipping 2847 matching lines @@
 
   if (FLAG_trace_constant_propagation) {
     OS::Print("\n==== After constant propagation ====\n");
     FlowGraphPrinter printer(*graph_);
     printer.PrintBlocks();
   }
 }
 
 
 }  // namespace dart