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comparison src/share/vm/opto/macro.cpp @ 3961:a92cdbac8b9e

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7081933: Use zeroing elimination optimization for large array Summary: Don't zero new typeArray during runtime call if the allocation is followed by arraycopy into it. Reviewed-by: twisti
author kvn
date Mon, 26 Sep 2011 10:24:05 -0700
parents 1af104d6cf99
children 1bd45abaa507
comparison
equal deleted inserted replaced
3960:f08d439fab8c 3961:a92cdbac8b9e
1683 OptoRuntime::new_instance_Java()); 1683 OptoRuntime::new_instance_Java());
1684 } 1684 }
1685 1685
1686 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) { 1686 void PhaseMacroExpand::expand_allocate_array(AllocateArrayNode *alloc) {
1687 Node* length = alloc->in(AllocateNode::ALength); 1687 Node* length = alloc->in(AllocateNode::ALength);
1688 InitializeNode* init = alloc->initialization();
1689 Node* klass_node = alloc->in(AllocateNode::KlassNode);
1690 ciKlass* k = _igvn.type(klass_node)->is_klassptr()->klass();
1691 address slow_call_address; // Address of slow call
1692 if (init != NULL && init->is_complete_with_arraycopy() &&
1693 k->is_type_array_klass()) {
1694 // Don't zero type array during slow allocation in VM since
1695 // it will be initialized later by arraycopy in compiled code.
1696 slow_call_address = OptoRuntime::new_array_nozero_Java();
1697 } else {
1698 slow_call_address = OptoRuntime::new_array_Java();
1699 }
1688 expand_allocate_common(alloc, length, 1700 expand_allocate_common(alloc, length,
1689 OptoRuntime::new_array_Type(), 1701 OptoRuntime::new_array_Type(),
1690 OptoRuntime::new_array_Java()); 1702 slow_call_address);
1691 } 1703 }
1692 1704
1693 //-----------------------mark_eliminated_locking_nodes----------------------- 1705 //-----------------------mark_eliminated_locking_nodes-----------------------
1694 // During EA obj may point to several objects but after few ideal graph 1706 // During EA obj may point to several objects but after few ideal graph
1695 // transformations (CCP) it may point to only one non escaping object 1707 // transformations (CCP) it may point to only one non escaping object