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#![no_std]
use core::mem::MaybeUninit;
pub type U256 = [u128; 2];
macro_rules! def {
($(
$(#[$a:meta])*
pub fn $name:ident(
$($p:ident : $t:ty),*
) $(-> $ret:ty)?;
)*) => {
#[allow(improper_ctypes)]
extern "C" {$(
link! {
concat!("__ethnum_", stringify!($name));
pub fn $name(
$($p: $t,)*
) $(-> $ret)?;
}
)*}
};
}
macro_rules! link {
($sym:expr; $fn:item) => {
#[link_name = $sym]
$fn
};
}
def! {
pub fn add2(r: &mut U256, a: &U256);
pub fn add3(r: &mut MaybeUninit<U256>, a: &U256, b: &U256);
pub fn addc(r: &mut MaybeUninit<U256>, a: &U256, b: &U256) -> bool;
pub fn mul2(r: &mut U256, a: &U256);
pub fn mul3(r: &mut MaybeUninit<U256>, a: &U256, b: &U256);
pub fn mulc(r: &mut MaybeUninit<U256>, a: &U256, b: &U256) -> bool;
pub fn sub2(r: &mut U256, a: &U256);
pub fn sub3(r: &mut MaybeUninit<U256>, a: &U256, b: &U256);
pub fn subc(r: &mut MaybeUninit<U256>, a: &U256, b: &U256) -> bool;
pub fn shl2(r: &mut U256, a: u32);
pub fn shl3(r: &mut MaybeUninit<U256>, a: &U256, b: u32);
pub fn shr2(r: &mut U256, a: u32);
pub fn shr3(r: &mut MaybeUninit<U256>, a: &U256, b: u32);
pub fn rotate_left(r: &mut MaybeUninit<U256>, a: &U256, b: u32);
pub fn rotate_right(r: &mut MaybeUninit<U256>, a: &U256, b: u32);
pub fn ctlz(a: &U256) -> u32;
pub fn cttz(a: &U256) -> u32;
}