#[cfg(target_pointer_width = "32")]
macro_rules! limbs {
( $($limb:expr),+ ) => {
[ $($limb),+ ]
};
}
#[cfg(target_pointer_width = "64")]
macro_rules! limbs {
( $($limb_lo:expr, $limb_hi:expr),+) => {
[ $((($limb_hi | 0u64) << 32) | $limb_lo),+ ]
};
}