From 5c265cf7676c80ffd4df8dc15ac67fd7c752b54e Mon Sep 17 00:00:00 2001
From: kvn <unknown>
Date: Fri, 5 Sep 2008 13:33:55 -0700
Subject: [PATCH] 6676462: JVM sometimes would suddenly consume significant
 amount of memory Summary: Add asserts with dead loop checks in
 AddNode::Ideal(). Reviewed-by: never

---
 src/share/vm/opto/addnode.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/share/vm/opto/addnode.cpp b/src/share/vm/opto/addnode.cpp
index 066ec6d71..e207e65ea 100644
--- a/src/share/vm/opto/addnode.cpp
+++ b/src/share/vm/opto/addnode.cpp
@@ -157,6 +157,7 @@ Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) {
     Node *a12 = add1->in(2);
     const Type *t12 = phase->type( a12 );
     if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) ) {
+      assert(add1->in(1) != this, "dead loop in AddNode::Ideal");
       add2 = add1->clone();
       add2->set_req(2, in(2));
       add2 = phase->transform(add2);
@@ -173,6 +174,7 @@ Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) {
     Node *a22 = add2->in(2);
     const Type *t22 = phase->type( a22 );
     if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) ) {
+      assert(add2->in(1) != this, "dead loop in AddNode::Ideal");
       Node *addx = add2->clone();
       addx->set_req(1, in(1));
       addx->set_req(2, add2->in(1));
-- 
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