--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/torture/pr81790.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,28 @@
+/* { dg-do compile } */
+/* { dg-additional-options "--param sccvn-max-scc-size=10" } */
+
+typedef int a __attribute__ ((__vector_size__ (16)));
+typedef struct
+{
+  a b;
+} c;
+
+int d, e;
+
+void foo (c *ptr);
+
+void bar ()
+{
+  double b = 1842.9028;
+  c g, h;
+  if (d)
+    b = 77.7998;
+  for (; e;)
+    {
+      g.b = g.b = g.b + g.b;
+      h.b = (a){b};
+      h.b = h.b + h.b;
+    }
+  foo (&g);
+  foo (&h);
+}