68 lines
1.7 KiB
Rust
68 lines
1.7 KiB
Rust
use int::LargeInt;
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use int::Int;
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trait UAdd: LargeInt {
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fn uadd(self, other: Self) -> Self {
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let (low, carry) = self.low().overflowing_add(other.low());
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let high = self.high().wrapping_add(other.high());
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let carry = if carry { Self::HighHalf::ONE } else { Self::HighHalf::ZERO };
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Self::from_parts(low, high.wrapping_add(carry))
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}
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}
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impl UAdd for u128 {}
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trait Add: Int
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where <Self as Int>::UnsignedInt: UAdd
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{
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fn add(self, other: Self) -> Self {
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Self::from_unsigned(self.unsigned().uadd(other.unsigned()))
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}
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}
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impl Add for u128 {}
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impl Add for i128 {}
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trait Addo: Add
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where <Self as Int>::UnsignedInt: UAdd
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{
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fn addo(self, other: Self, overflow: &mut i32) -> Self {
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*overflow = 0;
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let result = Add::add(self, other);
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if other >= Self::ZERO {
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if result < self {
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*overflow = 1;
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}
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} else {
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if result >= self {
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*overflow = 1;
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}
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}
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result
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}
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}
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impl Addo for i128 {}
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impl Addo for u128 {}
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#[cfg_attr(not(stage0), lang = "i128_add")]
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pub fn rust_i128_add(a: i128, b: i128) -> i128 {
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rust_u128_add(a as _, b as _) as _
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}
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#[cfg_attr(not(stage0), lang = "i128_addo")]
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pub fn rust_i128_addo(a: i128, b: i128) -> (i128, bool) {
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let mut oflow = 0;
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let r = a.addo(b, &mut oflow);
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(r, oflow != 0)
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}
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#[cfg_attr(not(stage0), lang = "u128_add")]
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pub fn rust_u128_add(a: u128, b: u128) -> u128 {
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a.add(b)
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}
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#[cfg_attr(not(stage0), lang = "u128_addo")]
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pub fn rust_u128_addo(a: u128, b: u128) -> (u128, bool) {
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let mut oflow = 0;
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let r = a.addo(b, &mut oflow);
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(r, oflow != 0)
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}
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