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diff src/share/vm/runtime/arguments.cpp @ 642:660978a2a31a

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6791178: Specialize for zero as the compressed oop vm heap base Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb. Reviewed-by: never, twisti, jcoomes, coleenp
author kvn
date Thu, 12 Mar 2009 10:37:46 -0700
parents dca06e7f503d
children bd441136a5ce
line wrap: on
line diff
--- a/src/share/vm/runtime/arguments.cpp	Wed Mar 11 14:16:13 2009 -0700
+++ b/src/share/vm/runtime/arguments.cpp	Thu Mar 12 10:37:46 2009 -0700
@@ -1211,7 +1211,9 @@
     if (UseLargePages && UseCompressedOops) {
       // Cannot allocate guard pages for implicit checks in indexed addressing
       // mode, when large pages are specified on windows.
-      FLAG_SET_DEFAULT(UseImplicitNullCheckForNarrowOop, false);
+      // This flag could be switched ON if narrow oop base address is set to 0,
+      // see code in Universe::initialize_heap().
+      Universe::set_narrow_oop_use_implicit_null_checks(false);
     }
 #endif //  _WIN64
   } else {