/* initialize data structure for given irn in given phase */
static void *irn_phi_class_init(ir_phase *ph, ir_node *irn, void *data) {
irn_phi_class_t *ipc = data ? data : phase_alloc(ph, sizeof(ipc[0]));
+ (void) irn;
memset(ipc, 0, sizeof(ipc[0]));
return ipc;
}