  switch ((int) ix86_arch )				\
    {							\
    case PROCESSOR_PENTIUM4:				\
       builtin_define_with_value ("_M_IX86","700",0);	\
      break;						\
    case PROCESSOR_PENTIUMPRO:				\
    case PROCESSOR_ATHLON:				\
      builtin_define_with_value ("_M_IX86","600",0);	\
      break;						\
    case PROCESSOR_PENTIUM:				\
    case PROCESSOR_K6:					\				\
      builtin_define_with_value ("_M_IX86","500",0);	\
      break;						\
    case PROCESSOR_I486:				\
      builtin_define_with_value ("_M_IX86","400",0);	\
      break;						\
    default:						\
      builtin_define_with_value ("_M_IX86","300",0);	\
      break;						\
    } 							\

