         i0 = i0 + sd___0;         i0 = i0 + sd__a0;         i0 = i0 + sd_b_0;         i0 = i0 + sd_ba0;         i0 = i0 + sdc__0;         i0 = i0 + sdc_a0;         i0 = i0 + sdcb_0;         i0 = i0 + sdcba0;      