diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 14fb81a6de3..06abb6b6c87 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2019-06-21  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/90930
+	* tree-ssa-reassoc.c (rewrite_expr_tree_parallel): Set visited
+	flag on new stmts to avoid re-processing them.
+
 2019-06-21  Matthew Beliveau  <mbelivea@redhat.com>
 
 	PR c++/90875 - added -Wswitch-outside-range option
diff --git a/gcc/tree-ssa-reassoc.c b/gcc/tree-ssa-reassoc.c
index 32bff979416..7161c4c36c3 100644
--- a/gcc/tree-ssa-reassoc.c
+++ b/gcc/tree-ssa-reassoc.c
@@ -4812,6 +4812,7 @@ rewrite_expr_tree_parallel (gassign *stmt, int width,
       else
 	{
 	  stmts[i] = build_and_add_sum (TREE_TYPE (last_rhs1), op1, op2, opcode);
+	  gimple_set_visited (stmts[i], true);
 	}
       if (dump_file && (dump_flags & TDF_DETAILS))
 	{