+
−/* { dg-do compile } */
+
−/* { dg-options "-O2 -fdump-tree-optimized -w" } */
+
−
+
−struct ehci_regs {
+
−    char x;
+
−    unsigned int port_status[0];
+
−} __attribute__ ((packed));
+
−
+
−struct ehci_hcd {
+
−    struct ehci_regs *regs;
+
−};
+
−
+
−int ehci_hub_control (struct ehci_hcd *ehci, int wIndex)
+
−{
+
−  unsigned int *status_reg = &ehci->regs->port_status[wIndex];
+
−  return *(volatile unsigned int *)status_reg;
+
−}
+
−
+
−/* { dg-final { scan-tree-dump "={v}" "optimized" } } */