--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/tree-ssa/pr86062.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,23 @@
+// { dg-do compile }
+// { dg-require-effective-target c++14 }
+// { dg-options "-O2 -ffinite-math-only -fdump-tree-fre1" }
+
+#include <array>
+
+struct I { double i,s; I(double d):i(d),s(d){} };
+typedef std::array<double,3> P;
+typedef std::array<I,3> AP;
+
+static AP c(P const&p){
+      return {p[0],p[1],p[2]};
+}
+template<class T> auto const& ac(T const&p, int n){return p[n];}
+static double g(P const&p, int n)
+{
+    I res = ac(c(p),n);
+      return res.s-res.i;
+}
+
+__attribute__((flatten)) double fff(P p){ return g(p,1); }
+
+// { dg-final { scan-tree-dump "return 0.0;" "fre1" } }