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6791178: Specialize for zero as the compressed oop vm heap base

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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
This commit is contained in:
Vladimir Kozlov 2009-03-12 10:37:46 -07:00
parent 66cecec230
commit 69f9ddee90
45 changed files with 1072 additions and 220 deletions
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4
hotspot/src/share/vm/runtime/arguments.cpp
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@ -1211,7 +1211,9 @@ void Arguments::set_ergonomics_flags() {
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 {