XFS_BLF_SHIFT
first_bit = first >> XFS_BLF_SHIFT;
last_bit = last >> XFS_BLF_SHIFT;
((uint)bit << XFS_BLF_SHIFT) + (nbits << XFS_BLF_SHIFT));
if (item->ri_buf[i].iov_len < (nbits << XFS_BLF_SHIFT))
nbits = item->ri_buf[i].iov_len >> XFS_BLF_SHIFT;
(uint)bit << XFS_BLF_SHIFT), /* dest */
nbits<<XFS_BLF_SHIFT); /* length */
reg_buf_offset = bit << XFS_BLF_SHIFT;
reg_buf_bytes = nbits << XFS_BLF_SHIFT;