LOWEST_SET_BIT
#define MASK_TO_SHIFT2(m) (GTEQ_POWER(LOWEST_SET_BIT((m)), 1) ? 1 : 0)
(GTEQ_POWER(LOWEST_SET_BIT((m)), 2) \
(GTEQ_POWER(LOWEST_SET_BIT((m)), 4) \
(GTEQ_POWER(LOWEST_SET_BIT((m)), 8) \
(GTEQ_POWER(LOWEST_SET_BIT((m)), 16) \