parameter SOME_SIZE=10
…

generate

    genvar i;

for (i = 0; i < SOME_SIZE; i = i + 1)
begin : rep_inst
        assign some_dst[i] = some_src0[i] * some_src1[i];

        some_module # (some_parameter) some_instance
                (clk_i, rst_i, some_src0[i], some_src1[i]);
    end

endgenerate