From 56c828b704cf049c95962d39e715c68907f6a305 Mon Sep 17 00:00:00 2001
From: rasbold <none@none>
Date: Wed, 9 Apr 2008 09:25:45 -0700
Subject: 6684385: Loop unswitching crashes without LoopNode Summary: Without
 LoopNode, exit early from loop unswitching and partial peeling Reviewed-by:
 kvn, never, sgoldman

---
 src/share/vm/opto/loopopts.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/share/vm/opto/loopopts.cpp')

diff --git a/src/share/vm/opto/loopopts.cpp b/src/share/vm/opto/loopopts.cpp
index 6535c5529..52dc89266 100644
--- a/src/share/vm/opto/loopopts.cpp
+++ b/src/share/vm/opto/loopopts.cpp
@@ -2257,6 +2257,9 @@ bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& p
 //
 bool PhaseIdealLoop::partial_peel( IdealLoopTree *loop, Node_List &old_new ) {
 
+  if (!loop->_head->is_Loop()) {
+    return false;  }
+
   LoopNode *head  = loop->_head->as_Loop();
 
   if (head->is_partial_peel_loop() || head->partial_peel_has_failed()) {
-- 
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