--- a/hotspot/src/share/vm/opto/callnode.cpp Mon Dec 21 16:58:29 2015 +0000
+++ b/hotspot/src/share/vm/opto/callnode.cpp Sun Dec 27 05:15:14 2015 -0800
@@ -1333,6 +1333,7 @@
init_flags(Flag_is_macro);
_is_scalar_replaceable = false;
_is_non_escaping = false;
+ _is_allocation_MemBar_redundant = false;
Node *topnode = C->top();
init_req( TypeFunc::Control , ctrl );
@@ -1347,6 +1348,23 @@
C->add_macro_node(this);
}
+void AllocateNode::compute_MemBar_redundancy(ciMethod* initializer)
+{
+ assert(initializer != NULL &&
+ initializer->is_initializer() &&
+ !initializer->is_static(),
+ "unexpected initializer method");
+ BCEscapeAnalyzer* analyzer = initializer->get_bcea();
+ if (analyzer == NULL) {
+ return;
+ }
+
+ // Allocation node is first parameter in its initializer
+ if (analyzer->is_arg_stack(0) || analyzer->is_arg_local(0)) {
+ _is_allocation_MemBar_redundant = true;
+ }
+}
+
//=============================================================================
Node* AllocateArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) {
if (remove_dead_region(phase, can_reshape)) return this;