--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr30643.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler-not "undefined" } } */
+
+/* Make sure we optimize all calls away.  */
+
+extern void undefined (void);
+struct s { int a, b; };
+void bar (struct s *ps,  int *p, int *__restrict__ rp, int *__restrict__ rq)
+{
+  ps->a = 0;
+  ps->b = 1;
+  if (ps->a != 0)
+    undefined ();
+  p[0] = 0;
+  p[1] = 1;
+  if (p[0] != 0)
+    undefined ();
+  rp[0] = 0;
+  rq[0] = 1;
+  if (rp[0] != 0)
+    undefined ();
+}
+int main (void) {
+  return 0;
+}