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changeset 108:a761c2d3b76a

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6684385: Loop unswitching crashes without LoopNode Summary: Without LoopNode, exit early from loop unswitching and partial peeling Reviewed-by: kvn, never, sgoldman
author rasbold
date Wed, 09 Apr 2008 09:25:45 -0700
parents 93b6525e3b82
children 9f4457a14b58
files src/share/vm/opto/loopUnswitch.cpp src/share/vm/opto/loopopts.cpp
diffstat 2 files changed, 6 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/opto/loopUnswitch.cpp	Tue Apr 08 12:23:15 2008 -0400
+++ b/src/share/vm/opto/loopUnswitch.cpp	Wed Apr 09 09:25:45 2008 -0700
@@ -51,6 +51,9 @@
   if( !LoopUnswitching ) {
     return false;
   }
+  if (!_head->is_Loop()) {
+    return false;
+  }
   uint nodes_left = MaxNodeLimit - phase->C->unique();
   if (2 * _body.size() > nodes_left) {
     return false; // Too speculative if running low on nodes.
--- a/src/share/vm/opto/loopopts.cpp	Tue Apr 08 12:23:15 2008 -0400
+++ b/src/share/vm/opto/loopopts.cpp	Wed Apr 09 09:25:45 2008 -0700
@@ -2257,6 +2257,9 @@
 //
 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()) {