MODE_MF_AFEX
SET_FLAGS(flags, MODE_MF_AFEX);
DbgBreakIf(!AT_MOST_SINGLE_SET(GET_FLAGS(flags,MODE_MF_SD|MODE_MF_SI|MODE_MF_AFEX)));
DbgBreakIf(GET_FLAGS(flags, MODE_MF)&& !(GET_FLAGS(flags,MODE_MF_SD|MODE_MF_SI|MODE_MF_AFEX) ));