# HG changeset patch
# User vlivanov
# Date 1495803931 -10800
#      Fri May 26 16:05:31 2017 +0300
# Node ID 624b7889534d5cd536f4a9de66860a9680d705b8
# Parent  d53171650a2cc6c6f699c966c533b914ca9c0602
[mq]: 8179882.cast

diff --git a/src/share/vm/opto/loopnode.cpp b/src/share/vm/opto/loopnode.cpp
--- a/src/share/vm/opto/loopnode.cpp
+++ b/src/share/vm/opto/loopnode.cpp
@@ -1860,6 +1860,9 @@
   if (_required_safept != NULL && _required_safept->size() > 0) {
     tty->print(" req={"); _required_safept->dump_simple(); tty->print(" }");
   }
+  if (Verbose) {
+    tty->print(" body={"); _body.dump_simple(); tty->print(" }");
+  }
   tty->cr();
 }
 
diff --git a/src/share/vm/opto/loopopts.cpp b/src/share/vm/opto/loopopts.cpp
--- a/src/share/vm/opto/loopopts.cpp
+++ b/src/share/vm/opto/loopopts.cpp
@@ -913,7 +913,10 @@
 
   if (n->is_ConstraintCast()) {
     Node* dom_cast = n->as_ConstraintCast()->dominating_cast(this);
-    if (dom_cast != NULL) {
+    // ConstraintCastNode::dominating_cast() uses node control input to determine dominance.
+    // It doesn't necessarily agree with loop control info (due to transformations happened in between),
+    // thus additional dominance check is needed to keep loop info valid.
+    if (dom_cast != NULL && is_dominator(get_ctrl(dom_cast), get_ctrl(n))) {
       _igvn.replace_node(n, dom_cast);
       return dom_cast;
     }