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use int::Int; use int::LargeInt; trait UAddSub: LargeInt { fn uadd(self, other: Self) -> Self { let (low, carry) = self.low().overflowing_add(other.low()); let high = self.high().wrapping_add(other.high()); let carry = if carry { Self::HighHalf::ONE } else { Self::HighHalf::ZERO }; Self::from_parts(low, high.wrapping_add(carry)) } fn uadd_one(self) -> Self { let (low, carry) = self.low().overflowing_add(Self::LowHalf::ONE); let carry = if carry { Self::HighHalf::ONE } else { Self::HighHalf::ZERO }; Self::from_parts(low, self.high().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, overflow: &mut i32) -> Self { *overflow = 0; let result = AddSub::add(self, other); if other >= Self::ZERO { if result < self { *overflow = 1; } } else { if result >= self { *overflow = 1; } } result } } impl Addo for i128 {} impl Addo for u128 {} trait Subo: AddSub where <Self as Int>::UnsignedInt: UAddSub, { fn subo(self, other: Self, overflow: &mut i32) -> Self { *overflow = 0; let result = AddSub::sub(self, other); if other >= Self::ZERO { if result > self { *overflow = 1; } } else { if result <= self { *overflow = 1; } } result } } impl Subo for i128 {} impl Subo for u128 {} intrinsics! { pub extern "C" fn __rust_i128_add(a: i128, b: i128) -> i128 { __rust_u128_add(a as _, b as _) as _ } pub extern "C" fn __rust_i128_addo(a: i128, b: i128) -> (i128, bool) { let mut oflow = 0; let r = a.addo(b, &mut oflow); (r, oflow != 0) } pub extern "C" fn __rust_u128_add(a: u128, b: u128) -> u128 { a.add(b) } pub extern "C" fn __rust_u128_addo(a: u128, b: u128) -> (u128, bool) { let mut oflow = 0; let r = a.addo(b, &mut oflow); (r, oflow != 0) } pub extern "C" fn __rust_i128_sub(a: i128, b: i128) -> i128 { __rust_u128_sub(a as _, b as _) as _ } pub extern "C" fn __rust_i128_subo(a: i128, b: i128) -> (i128, bool) { let mut oflow = 0; let r = a.subo(b, &mut oflow); (r, oflow != 0) } pub extern "C" fn __rust_u128_sub(a: u128, b: u128) -> u128 { a.sub(b) } pub extern "C" fn __rust_u128_subo(a: u128, b: u128) -> (u128, bool) { let mut oflow = 0; let r = a.subo(b, &mut oflow); (r, oflow != 0) } }