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8076188: Optimize arraycopy out for non escaping destination

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If the destination of an arraycopy is non escaping, the arraycopy may be optimized out

Reviewed-by: kvn, vlivanov
This commit is contained in:
Roland Westrelin 2015-05-12 10:27:50 +02:00
parent 3dc9461bc8
commit a9cdbd0407
17 changed files with 1224 additions and 486 deletions
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18
hotspot/src/share/vm/opto/macroArrayCopy.cpp
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@ -1097,8 +1097,15 @@ void PhaseMacroExpand::expand_arraycopy_node(ArrayCopyNode *ac) {
assert(alloc != NULL, "expect alloc");
}
const TypePtr* adr_type = _igvn.type(dest)->is_oopptr()->add_offset(Type::OffsetBot);
if (ac->_dest_type != TypeOopPtr::BOTTOM) {
adr_type = ac->_dest_type->add_offset(Type::OffsetBot)->is_ptr();
}
if (ac->_src_type != ac->_dest_type) {
adr_type = TypeRawPtr::BOTTOM;
}
generate_arraycopy(ac, alloc, &ctrl, merge_mem, &io,
TypeAryPtr::OOPS, T_OBJECT,
adr_type, T_OBJECT,
src, src_offset, dest, dest_offset, length,
true, !ac->is_copyofrange());
@ -1152,7 +1159,7 @@ void PhaseMacroExpand::expand_arraycopy_node(ArrayCopyNode *ac) {
}
// (2) src and dest arrays must have elements of the same BasicType
// Figure out the size and type of the elements we will be copying.
BasicType src_elem = top_src->klass()->as_array_klass()->element_type()->basic_type();
BasicType src_elem = top_src->klass()->as_array_klass()->element_type()->basic_type();
BasicType dest_elem = top_dest->klass()->as_array_klass()->element_type()->basic_type();
if (src_elem == T_ARRAY) src_elem = T_OBJECT;
if (dest_elem == T_ARRAY) dest_elem = T_OBJECT;
@ -1232,6 +1239,13 @@ void PhaseMacroExpand::expand_arraycopy_node(ArrayCopyNode *ac) {
}
// This is where the memory effects are placed:
const TypePtr* adr_type = TypeAryPtr::get_array_body_type(dest_elem);
if (ac->_dest_type != TypeOopPtr::BOTTOM) {
adr_type = ac->_dest_type->add_offset(Type::OffsetBot)->is_ptr();
}
if (ac->_src_type != ac->_dest_type) {
adr_type = TypeRawPtr::BOTTOM;
}
generate_arraycopy(ac, alloc, &ctrl, merge_mem, &io,
adr_type, dest_elem,
src, src_offset, dest, dest_offset, length,