Mercurial > hg > truffle
diff src/share/vm/runtime/arguments.cpp @ 642:660978a2a31a
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 |
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--- 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 {