/rust/registry/src/index.crates.io-1949cf8c6b5b557f/crypto-bigint-0.5.5/src/uint/split.rs

Source
use crate::{Limb, Uint};

/// Split this number in half, returning its high and low components
/// respectively.
#[inline]
pub(crate) const fn split_mixed<const L: usize, const H: usize, const O: usize>(
    n: &Uint<O>,
) -> (Uint<H>, Uint<L>) {
    let top = L + H;
    let top = if top < O { top } else { O };
    let mut lo = [Limb::ZERO; L];
    let mut hi = [Limb::ZERO; H];
    let mut i = 0;

    while i < top {
        if i < L {
            lo[i] = n.limbs[i];
        } else {
            hi[i - L] = n.limbs[i];
        }
        i += 1;
    }

    (Uint { limbs: hi }, Uint { limbs: lo })
}

#[cfg(test)]
mod tests {
    use crate::{U128, U64};

    #[test]
    fn split() {
        let (hi, lo) = U128::from_be_hex("00112233445566778899aabbccddeeff").split();
        assert_eq!(hi, U64::from_u64(0x0011223344556677));
        assert_eq!(lo, U64::from_u64(0x8899aabbccddeeff));
    }
}

Coverage Report

Created: 2026-01-13 06:57

Line	Count	Source
1		use crate::{Limb, Uint};
2
3		/// Split this number in half, returning its high and low components
4		/// respectively.
5		#[inline]
6	0	pub(crate) const fn split_mixed<const L: usize, const H: usize, const O: usize>(
7	0	n: &Uint<O>,
8	0	) -> (Uint<H>, Uint<L>) {
9	0	let top = L + H;
10	0	let top = if top < O { top } else { O };
11	0	let mut lo = [Limb::ZERO; L];
12	0	let mut hi = [Limb::ZERO; H];
13	0	let mut i = 0;
14
15	0	while i < top {
16	0	if i < L {
17	0	lo[i] = n.limbs[i];
18	0	} else {
19	0	hi[i - L] = n.limbs[i];
20	0	}
21	0	i += 1;
22		}
23
24	0	(Uint { limbs: hi }, Uint { limbs: lo })
25	0	} Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<16, 16, 32> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<24, 24, 48> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 1, 2> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 2, 3> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 3, 4> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 4, 5> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 5, 6> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 6, 7> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 7, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 8, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 9, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 10, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 11, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 12, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 13, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 14, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<1, 15, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<28, 28, 56> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<32, 32, 64> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<33, 33, 66> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<34, 34, 68> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 2, 4> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 1, 3> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 3, 5> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 4, 6> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 5, 7> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 6, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 7, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 8, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 9, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 10, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 11, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 12, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 13, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<2, 14, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<48, 48, 96> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 3, 6> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 1, 4> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 2, 5> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 4, 7> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 5, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 6, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 7, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 8, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 9, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 10, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 11, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 12, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<3, 13, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<64, 64, 128> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 4, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 1, 5> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 2, 6> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 3, 7> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 5, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 6, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 7, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 8, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 9, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 10, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 11, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<4, 12, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 5, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 1, 6> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 2, 7> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 3, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 4, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 6, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 7, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 8, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 9, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 10, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<5, 11, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 6, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 1, 7> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 2, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 3, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 4, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 5, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 7, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 8, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 9, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<6, 10, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 7, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 1, 8> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 2, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 3, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 4, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 5, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 6, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 8, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<7, 9, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<128, 128, 256> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 8, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 1, 9> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 2, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 3, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 4, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 5, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 6, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<8, 7, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 1, 10> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 2, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 3, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 4, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 5, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 6, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<9, 7, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 10, 20> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 1, 11> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 2, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 3, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 4, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 5, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<10, 6, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<11, 1, 12> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<11, 2, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<11, 3, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<11, 4, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<11, 5, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<12, 12, 24> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<12, 1, 13> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<12, 2, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<12, 3, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<12, 4, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<13, 1, 14> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<13, 2, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<13, 3, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<14, 14, 28> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<14, 1, 15> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<14, 2, 16> Unexecuted instantiation: crypto_bigint::uint::split::split_mixed::<15, 1, 16>
26
27		#[cfg(test)]
28		mod tests {
29		use crate::{U128, U64};
30
31		#[test]
32		fn split() {
33		let (hi, lo) = U128::from_be_hex("00112233445566778899aabbccddeeff").split();
34		assert_eq!(hi, U64::from_u64(0x0011223344556677));
35		assert_eq!(lo, U64::from_u64(0x8899aabbccddeeff));
36		}
37		}