# HG changeset patch
# User neliasso
# Date 1552486948 -3600
# Node ID 195309a6c7d558eb587c4281366c086d0c714291
# Parent  1a6a5a0260a745b9e1325a28478c860efa3cf5d9
8219517: assert(false) failed: infinite loop in PhaseIterGVN::optimize
Reviewed-by: kvn, thartmann

diff -r 1a6a5a0260a7 -r 195309a6c7d5 src/hotspot/share/opto/memnode.cpp
--- a/src/hotspot/share/opto/memnode.cpp	Wed Mar 13 07:16:57 2019 -0700
+++ b/src/hotspot/share/opto/memnode.cpp	Wed Mar 13 15:22:28 2019 +0100
@@ -1394,6 +1394,14 @@
         Node* in = mem->in(i);
         Node*  m = optimize_memory_chain(in, t_oop, this, phase);
         if (m == mem) {
+          if (i == 1) {
+            // if the first edge was a loop, check second edge too.
+            // If both are replaceable - we are in an infinite loop
+            Node *n = optimize_memory_chain(mem->in(2), t_oop, this, phase);
+            if (n == mem) {
+              break;
+            }
+          }
           set_req(Memory, mem->in(cnt - i));
           return this; // made change
         }