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7081933: Use zeroing elimination optimization for large array

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Don't zero new typeArray during runtime call if the allocation is followed by arraycopy into it.

Reviewed-by: twisti
This commit is contained in:
Vladimir Kozlov 2011-09-26 10:24:05 -07:00
parent 95c56a472b
commit 47e357e16f
13 changed files with 97 additions and 11 deletions
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9
hotspot/src/share/vm/memory/oopFactory.cpp
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@ -77,7 +77,14 @@ typeArrayOop oopFactory::new_permanent_intArray(int length, TRAPS) {
typeArrayOop oopFactory::new_typeArray(BasicType type, int length, TRAPS) {
klassOop type_asKlassOop = Universe::typeArrayKlassObj(type);
typeArrayKlass* type_asArrayKlass = typeArrayKlass::cast(type_asKlassOop);
typeArrayOop result = type_asArrayKlass->allocate(length, THREAD);
typeArrayOop result = type_asArrayKlass->allocate_common(length, true, THREAD);
return result;
}
typeArrayOop oopFactory::new_typeArray_nozero(BasicType type, int length, TRAPS) {
klassOop type_asKlassOop = Universe::typeArrayKlassObj(type);
typeArrayKlass* type_asArrayKlass = typeArrayKlass::cast(type_asKlassOop);
typeArrayOop result = type_asArrayKlass->allocate_common(length, false, THREAD);
return result;
}