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use int::{DInt, Int};
trait UAddSub: DInt {
fn uadd(self, other: Self) -> Self {
let (lo, carry) = self.lo().overflowing_add(other.lo());
let hi = self.hi().wrapping_add(other.hi());
let carry = if carry { Self::H::ONE } else { Self::H::ZERO };
Self::from_lo_hi(lo, hi.wrapping_add(carry))
}
fn uadd_one(self) -> Self {
let (lo, carry) = self.lo().overflowing_add(Self::H::ONE);
let carry = if carry { Self::H::ONE } else { Self::H::ZERO };
Self::from_lo_hi(lo, self.hi().wrapping_add(carry))
}
fn usub(self, other: Self) -> Self {
let uneg = (!other).uadd_one();
self.uadd(uneg)
}
}
impl UAddSub for u128 {}
trait AddSub: Int
where
<Self as Int>::UnsignedInt: UAddSub,
{
fn add(self, other: Self) -> Self {
Self::from_unsigned(self.unsigned().uadd(other.unsigned()))
}
fn sub(self, other: Self) -> Self {
Self::from_unsigned(self.unsigned().usub(other.unsigned()))
}
}
impl AddSub for u128 {}
impl AddSub for i128 {}
trait Addo: AddSub
where
<Self as Int>::UnsignedInt: UAddSub,
{
fn addo(self, other: Self) -> (Self, bool) {
let sum = AddSub::add(self, other);
(sum, (other < Self::ZERO) != (sum < self))
}
}
impl Addo for i128 {}
impl Addo for u128 {}
trait Subo: AddSub
where
<Self as Int>::UnsignedInt: UAddSub,
{
fn subo(self, other: Self) -> (Self, bool) {
let sum = AddSub::sub(self, other);
(sum, (other < Self::ZERO) != (self < sum))
}
}
impl Subo for i128 {}
impl Subo for u128 {}
intrinsics! {
pub extern "C" fn __rust_i128_add(a: i128, b: i128) -> i128 {
AddSub::add(a,b)
}
pub extern "C" fn __rust_i128_addo(a: i128, b: i128) -> (i128, bool) {
a.addo(b)
}
pub extern "C" fn __rust_u128_add(a: u128, b: u128) -> u128 {
AddSub::add(a,b)
}
pub extern "C" fn __rust_u128_addo(a: u128, b: u128) -> (u128, bool) {
a.addo(b)
}
pub extern "C" fn __rust_i128_sub(a: i128, b: i128) -> i128 {
AddSub::sub(a,b)
}
pub extern "C" fn __rust_i128_subo(a: i128, b: i128) -> (i128, bool) {
a.subo(b)
}
pub extern "C" fn __rust_u128_sub(a: u128, b: u128) -> u128 {
AddSub::sub(a,b)
}
pub extern "C" fn __rust_u128_subo(a: u128, b: u128) -> (u128, bool) {
a.subo(b)
}
}
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