STACK_SLOT_SZ
slot_hi = (-fp_off - 1) / STACK_SLOT_SZ;
slot_hi = (-fp_off - 1) / STACK_SLOT_SZ;
slot_lo = max_t(s32, (-fp_off - access_bytes) / STACK_SLOT_SZ, 0);
slot_hi = (-fp_off) / STACK_SLOT_SZ - 1;
slot_lo = max_t(s32, (-fp_off - access_bytes + STACK_SLOT_SZ - 1) / STACK_SLOT_SZ, 0);
space, frame, spi_off(spi) + (lo ? STACK_SLOT_SZ : 0), "h");