--- a/hotspot/src/share/vm/opto/superword.cpp Wed Sep 16 15:54:32 2015 -0700
+++ b/hotspot/src/share/vm/opto/superword.cpp Thu Sep 17 08:08:47 2015 +0200
@@ -2690,15 +2690,25 @@
//----------------------------get_pre_loop_end---------------------------
// Find pre loop end from main loop. Returns null if none.
-CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) {
- Node *ctrl = cl->in(LoopNode::EntryControl);
+CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode* cl) {
+ Node* ctrl = cl->in(LoopNode::EntryControl);
if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL;
- Node *iffm = ctrl->in(0);
+ Node* iffm = ctrl->in(0);
if (!iffm->is_If()) return NULL;
- Node *p_f = iffm->in(0);
+ Node* bolzm = iffm->in(1);
+ if (!bolzm->is_Bool()) return NULL;
+ Node* cmpzm = bolzm->in(1);
+ if (!cmpzm->is_Cmp()) return NULL;
+ Node* opqzm = cmpzm->in(2);
+ // Can not optimize a loop if zero-trip Opaque1 node is optimized
+ // away and then another round of loop opts attempted.
+ if (opqzm->Opcode() != Op_Opaque1) {
+ return NULL;
+ }
+ Node* p_f = iffm->in(0);
if (!p_f->is_IfFalse()) return NULL;
if (!p_f->in(0)->is_CountedLoopEnd()) return NULL;
- CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd();
+ CountedLoopEndNode* pre_end = p_f->in(0)->as_CountedLoopEnd();
CountedLoopNode* loop_node = pre_end->loopnode();
if (loop_node == NULL || !loop_node->is_pre_loop()) return NULL;
return pre_end;