1 /* { dg-do compile } */ 2 /* { dg-options "-O2 -fdump-tree-optimized -w" } */ 3 4 struct ehci_regs { 5 char x; 6 unsigned int port_status[0]; 7 } __attribute__ ((packed)); 8 9 struct ehci_hcd { 10 struct ehci_regs *regs; 11 }; 12 ehci_hub_control(struct ehci_hcd * ehci,int wIndex)13int ehci_hub_control (struct ehci_hcd *ehci, int wIndex) 14 { 15 unsigned int *status_reg = &ehci->regs->port_status[wIndex]; 16 return *(volatile unsigned int *)status_reg; 17 } 18 19 /* { dg-final { scan-tree-dump "={v}" "optimized" } } */ 20