SPL_SHIFT
#define SPL_TABLE_SIZE (1U << SPL_SHIFT)
((uintptr_t)(pp) >> (PP_SHIFT + SPL_SHIFT)) ^ \
((uintptr_t)(pp) >> (PP_SHIFT + SPL_SHIFT * 2)) ^ \
((uintptr_t)(pp) >> (PP_SHIFT + SPL_SHIFT * 3))) & \