Use -O9, tune for nocoma, assume at least a Pentium when generating code.

src/objects.cc

Index: src/objects.cc
===================================================================
--- src/objects.cc	(revision 384)
+++ src/objects.cc	(working copy)
@@ -1691,7 +1691,7 @@
 PropertyAttributes JSObject::GetPropertyAttributeWithReceiver(
       JSObject* receiver,
       String* key) {
-  uint32_t index;
+  uint32_t index = 0;

[bak, 2008/09/26 12:21:59]

Please add a comment why this assignment is necessary.

   if (key->AsArrayIndex(&index)) {
     if (HasElementWithReceiver(receiver, index)) return NONE;
     return ABSENT;
@@ -1738,7 +1738,7 @@
 
 PropertyAttributes JSObject::GetLocalPropertyAttribute(String* name) {
   // Check whether the name is an array index.
-  uint32_t index;
+  uint32_t index = 0;

[bak, 2008/09/26 12:21:59]

Please move the assignment into AsArrayIndex in objects-inl.h.

   if (name->AsArrayIndex(&index)) {
     if (HasLocalElement(index)) return NONE;
     return ABSENT;
@@ -2010,7 +2010,7 @@
   // ECMA-262, 3rd, 8.6.2.5
   ASSERT(name->IsString());
 
-  uint32_t index;
+  uint32_t index = 0;
   if (name->AsArrayIndex(&index)) {
     return DeleteElement(index);
   } else {