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use crate::{Concat, ConcatMixed, Limb, Uint};
impl<T> Concat for T
where
T: ConcatMixed<T>,
{
type Output = Self::MixedOutput;
}
/// Concatenate the two values, with `lo` as least significant and `hi`
/// as the most significant.
#[inline]
pub(crate) const fn concat_mixed<const L: usize, const H: usize, const O: usize>(
lo: &Uint<L>,
hi: &Uint<H>,
) -> Uint<O> {
let top = L + H;
let top = if top < O { top } else { O };
let mut limbs = [Limb::ZERO; O];
let mut i = 0;
while i < top {
if i < L {
limbs[i] = lo.limbs[i];
} else {
limbs[i] = hi.limbs[i - L];
}
i += 1;
}
Uint { limbs }
}
#[cfg(test)]
mod tests {
use crate::{ConcatMixed, U128, U192, U64};
#[test]
fn concat() {
let hi = U64::from_u64(0x0011223344556677);
let lo = U64::from_u64(0x8899aabbccddeeff);
assert_eq!(
hi.concat(&lo),
U128::from_be_hex("00112233445566778899aabbccddeeff")
);
}
#[test]
fn concat_mixed() {
let a = U64::from_u64(0x0011223344556677);
let b = U128::from_u128(0x8899aabbccddeeff_8899aabbccddeeff);
assert_eq!(
a.concat_mixed(&b),
U192::from_be_hex("00112233445566778899aabbccddeeff8899aabbccddeeff")
);
assert_eq!(
b.concat_mixed(&a),
U192::from_be_hex("8899aabbccddeeff8899aabbccddeeff0011223344556677")
);
}
#[test]
fn convert() {
let res: U128 = U64::ONE.mul_wide(&U64::ONE).into();
assert_eq!(res, U128::ONE);
let res: U128 = U64::ONE.square_wide().into();
assert_eq!(res, U128::ONE);
}
}
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