Avoid one repeated property lookup when computing load ICs.

src/x64/stub-cache-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/arguments.h"
 #include "src/codegen.h"
@@ skipping 1162 matching lines @@
   }
   __ ret(0);
 }
 
 
 #undef __
 #define __ ACCESS_MASM(masm())
 
 
 Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
-    Handle<PropertyCell> cell, Handle<Name> name, bool is_dont_delete) {
+    Handle<PropertyCell> cell, Handle<Name> name, bool is_configurable) {
   Label miss;
   FrontendHeader(receiver(), name, &miss);
 
   // Get the value from the cell.
   Register result = StoreIC::ValueRegister();
   __ Move(result, cell);
   __ movp(result, FieldOperand(result, PropertyCell::kValueOffset));
 
   // Check for deleted property if property can actually be deleted.
-  if (!is_dont_delete) {
+  if (is_configurable) {
     __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
     __ j(equal, &miss);
   } else if (FLAG_debug_code) {
     __ CompareRoot(result, Heap::kTheHoleValueRootIndex);
     __ Check(not_equal, kDontDeleteCellsCannotContainTheHole);
   }
 
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->named_load_global_stub(), 1);
   __ ret(0);
@@ skipping 107 matching lines @@
   // -----------------------------------
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_Miss);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64