crates/ring/src/arithmetic/n0.rs

// Copyright 2015-2022 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

use crate::limb::Limb;

#[derive(Clone)]
#[repr(transparent)]
pub(in super::super) struct N0([Limb; 2]);

impl N0 {
    #[cfg(feature = "alloc")]
    pub(super) const LIMBS_USED: usize = 64 / crate::limb::LIMB_BITS;
}

impl From<u64> for N0 {
    #[inline]
    fn from(n0: u64) -> Self {
        #[cfg(target_pointer_width = "64")]
        {
            Self([n0, 0])
        }

        #[cfg(target_pointer_width = "32")]
        {
            Self([n0 as Limb, (n0 >> crate::limb::LIMB_BITS) as Limb])
        }
    }
}