Elide hole checks on KeyedLoads of holey double arrays.

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 400 matching lines @@
 Handle<Code> FastCloneShallowObjectStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 template <>
 HValue* CodeStubGraphBuilder<KeyedLoadFastElementStub>::BuildCodeStub() {
   HInstruction* load = BuildUncheckedMonomorphicElementAccess(
       GetParameter(0), GetParameter(1), NULL, NULL,
       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
-      false, STANDARD_STORE, Representation::Tagged());
+      false, NEVER_RETURN_HOLE, STANDARD_STORE, Representation::Tagged());
   return load;
 }
 
 
 Handle<Code> KeyedLoadFastElementStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 template<>
@@ skipping 24 matching lines @@
 Handle<Code> KeyedLoadFieldStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 template <>
 HValue* CodeStubGraphBuilder<KeyedStoreFastElementStub>::BuildCodeStub() {
   BuildUncheckedMonomorphicElementAccess(
       GetParameter(0), GetParameter(1), GetParameter(2), NULL,
       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
-      true, casted_stub()->store_mode(), Representation::Tagged());
+      true, NEVER_RETURN_HOLE, casted_stub()->store_mode(),
+      Representation::Tagged());
 
   return GetParameter(2);
 }
 
 
 Handle<Code> KeyedStoreFastElementStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
@@ skipping 216 matching lines @@
       ? graph()->GetConstantSmi1()
       : graph()->GetConstantUndefined();
 }
 
 
 Handle<Code> CompareNilICStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 } }  // namespace v8::internal