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Make Uint::square into a const fn #514

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Merged
merged 1 commit into from
Dec 27, 2023
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Make Uint::square into a const fn #514

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7 changes: 4 additions & 3 deletions src/uint/mul.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

// TODO(tarcieri): use Karatsuba for better performance

use super::concat::concat_mixed;
use crate::{
Checked, CheckedMul, Concat, ConcatMixed, Limb, Uint, WideningMul, Wrapping, WrappingMul, Zero,
};
Expand Down Expand Up @@ -90,12 +91,12 @@ impl<const LIMBS: usize> Uint<LIMBS> {
}

/// Square self, returning a concatenated "wide" result.
pub fn square(&self) -> <Self as Concat>::Output
pub const fn square<const WIDE_LIMBS: usize>(&self) -> Uint<WIDE_LIMBS>
where
Self: Concat,
Self: Concat<Output = Uint<WIDE_LIMBS>>,
{
let (lo, hi) = self.square_wide();
hi.concat(&lo)
concat_mixed(&lo, &hi)
}

/// Square self, returning a "wide" result in two parts as (lo, hi).
Expand Down