Method uncheckedAdd

core/src/main/java/io/questdb/std/Decimal256.java:856–874

Adds the two's-complement representation of Decimal128 b to result in place. The 128-bit operand is sign-extended to 256 bits before performing the addition. This helper assumes that both operands already share the same scale and that the resulting value fits within a {@l

(Decimal256 result, Decimal128 b)

     * @param b      the 128-bit value to add, interpreted using two's-complement semantics
     */
    public static void uncheckedAdd(Decimal256 result, Decimal128 b) {
        long sign = b.getHigh() < 0 ? -1L : 0L;
        long r = result.ll + b.getLow();
        long carry = hasCarry(result.ll, r) ? 1L : 0L;
        result.ll = r;

        long t = result.lh + carry;
        carry = hasCarry(result.lh, t) ? 1L : 0L;
        r = t + b.getHigh();
        carry |= hasCarry(t, r) ? 1L : 0L;
        result.lh = r;

        t = result.hl + carry;
        carry = hasCarry(result.hl, t) ? 1L : 0L;
        r = t + sign;
        carry |= hasCarry(t, r) ? 1L : 0L;
        result.hl = r;
        result.hh = result.hh + carry + sign;
    }

    /**
     * Adds the two's-complement representation of {@link Decimal64} {@code b} to {@code result} in place.