public void handler() {
        /*TODO*///    UINT32 r, d;
        /*TODO*///    PAIR b;
        /*TODO*///    EXTWORD(b);
        /*TODO*///    d = X;
        /*TODO*///    r = d + b.d;
        /*TODO*///    CLR_NZVC;
        /*TODO*///    SET_FLAGS16(d, b.d, r);
        /*TODO*///    X = r;
            throw new UnsupportedOperationException("Unsupported");
        }