8210853: JIT: C2 doesn't skip post barrier for new allocated objects
Skip copy Region node when look for last allocation
Reviewed-by: thartmann, kvn
diff --git a/src/hotspot/share/opto/graphKit.cpp b/src/hotspot/share/opto/graphKit.cpp
index 715aa84..79f3695 100644
--- a/src/hotspot/share/opto/graphKit.cpp
+++ b/src/hotspot/share/opto/graphKit.cpp
@@ -2116,8 +2116,17 @@
// We use this to determine if an object is so "fresh" that
// it does not require card marks.
Node* GraphKit::just_allocated_object(Node* current_control) {
- if (C->recent_alloc_ctl() == current_control)
- return C->recent_alloc_obj();
+ Node* ctrl = current_control;
+ // Object::<init> is invoked after allocation, most of invoke nodes
+ // will be reduced, but a region node is kept in parse time, we check
+ // the pattern and skip the region node if it degraded to a copy.
+ if (ctrl != NULL && ctrl->is_Region() && ctrl->req() == 2 &&
+ ctrl->as_Region()->is_copy()) {
+ ctrl = ctrl->as_Region()->is_copy();
+ }
+ if (C->recent_alloc_ctl() == ctrl) {
+ return C->recent_alloc_obj();
+ }
return NULL;
}
