# HG changeset patch
# User kvn
# Date 1207013856 25200
# Node ID 5734cddd944b6ad50df624ddd5d84ad78ef4e8f7
# Parent  717d75d80a30be2a9a8807bcb5c9ce77907e60aa
6682236: C2 hits ideal nodes limit during IGVN optimization with EA
Summary: missing check in LoadNode::Ideal() causes infinite generation of a value Phi.
Reviewed-by: jrose, never

diff -r 717d75d80a30 -r 5734cddd944b hotspot/src/share/vm/opto/memnode.cpp
--- a/hotspot/src/share/vm/opto/memnode.cpp	Mon Mar 31 16:22:52 2008 -0700
+++ b/hotspot/src/share/vm/opto/memnode.cpp	Mon Mar 31 18:37:36 2008 -0700
@@ -1122,6 +1122,12 @@
         }
         // Split through Phi (see original code in loopopts.cpp).
         assert(phase->C->have_alias_type(addr_t), "instance should have alias type");
+
+        // Do nothing here if Identity will find a value
+        // (to avoid infinite chain of value phis generation).
+        if ( !phase->eqv(this, this->Identity(phase)) )
+          return NULL;
+
         const Type* this_type = this->bottom_type();
         int this_index  = phase->C->get_alias_index(addr_t);
         int this_offset = addr_t->offset();