ring/arithmetic/
n0.rs

1// Copyright 2015-2022 Brian Smith.
2//
3// Permission to use, copy, modify, and/or distribute this software for any
4// purpose with or without fee is hereby granted, provided that the above
5// copyright notice and this permission notice appear in all copies.
6//
7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15use crate::limb::Limb;
16
17#[derive(Clone, Copy)]
18#[repr(transparent)]
19pub struct N0([Limb; 2]);
20
21impl N0 {
22    #[cfg(feature = "alloc")]
23    pub(super) const LIMBS_USED: usize = 64 / crate::limb::LIMB_BITS;
24
25    #[inline]
26    pub const fn precalculated(n0: u64) -> Self {
27        #[cfg(target_pointer_width = "64")]
28        {
29            Self([n0, 0])
30        }
31
32        #[cfg(target_pointer_width = "32")]
33        {
34            Self([n0 as Limb, (n0 >> crate::limb::LIMB_BITS) as Limb])
35        }
36    }
37}