generate genvar i;
for (i=0; i<=7; i=i+1)
begin : for_name
adder add (a[8*i+7 : 8*i], b[8*i+7 : 8*i], ci[i], sum_for[8*i+7 : 8*i], c0_or[i+1]);
end
endgenerate
generate genvar i;
for (i=0; i<=7; i=i+1)
begin : for_name
adder add (a[8*i+7 : 8*i], b[8*i+7 : 8*i], ci[i], sum_for[8*i+7 : 8*i], c0_or[i+1]);
end
endgenerate