diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5d89dbb8e5e..20c5d584a73 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2016-08-18  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/77282
+	* tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
+	When doing auto-parallelizing also prevent use of PHIs that
+	carry dependences across loop backedges.
+
 2016-08-18  Tamar Christina  <tamar.christina@arm.com>
 	    Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
 
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 5d21c80493a..b1e869b8a4c 100644
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -4270,7 +4270,7 @@ eliminate_dom_walker::before_dom_children (basic_block b)
 	  if (sprime
 	      && TREE_CODE (sprime) == SSA_NAME
 	      && do_pre
-	      && flag_tree_loop_vectorize
+	      && (flag_tree_loop_vectorize || flag_tree_parallelize_loops)
 	      && loop_outer (b->loop_father)
 	      && has_zero_uses (sprime)
 	      && bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (sprime))