Method add

g2all/900/module/int64.js:99–107

(b)

    }

    add(b) {
        const values = lohi_from_one(b);
        const u32 = this._u32;
        const low = u32[0] + values[0];
        return new this.constructor(
            low >>> 0,
            (u32[1] + values[1] + (low > 0xffffffff)) >>> 0,
        );
    }

    sub(b) {
        const values = lohi_from_one(b);