n1_reg = arch_get_irn_register(arch_env, n1);
if (!arch_reg_is_allocatable(arch_env, n1, -1, n1_reg)) {
DBG((dbg, 0, "Register %s assigned to %+F is not allowed\n", n1_reg->name, n1));
n1_reg = arch_get_irn_register(arch_env, n1);
if (!arch_reg_is_allocatable(arch_env, n1, -1, n1_reg)) {
DBG((dbg, 0, "Register %s assigned to %+F is not allowed\n", n1_reg->name, n1));