--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/20040609-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,73 @@
+/* PRs target/15569, rtl-optimization/15681 */
+/* { dg-do compile } */
+/* { dg-options "-Os -frename-registers" } */
+/* { dg-options "-mconstant-gp -Os -frename-registers" { target ia64-*-* } } */
+
+struct S { struct S *a, *b; };
+struct T { struct S e; unsigned long a; int b, c; void *d; } f;
+
+unsigned long f1 (unsigned long);
+void f2 (int, struct T *);
+void *f3 (void *);
+unsigned long volatile g;
+
+static void
+f4 (struct T *p)
+{
+  f1 (f1 (((unsigned long) g - p->a) >> 20));
+}
+
+static struct T *
+f5 (void)
+{
+  struct T *g, *p;
+  struct T *q = 0;
+  for (g = p = &f; (g = p = (struct T *) (g->e.a)) != &f;)
+    if (p->b)
+      {
+	f4 (p);
+	if (p->c & 0x80000)
+	  return p;
+      }
+  return q;
+}
+
+static void
+f6 (struct T *p)
+{
+  f2 (9, p);
+}
+
+static inline void *
+f7 (struct T *t)
+{
+  void *d;
+  d = t->d;
+  if (d)
+    d = f3 (d);
+  return d;
+}
+
+static void *
+f8 (struct T *p)
+{
+  void *d = f7 (p);
+  if (!d)
+    return 0;
+  f6 (p);
+  return d;
+}
+
+static void
+f9 (void)
+{
+  struct T *p;
+  p = f5 ();
+  f8 (p);
+}
+
+void
+test (void)
+{
+  f9 ();
+}