cmp_offset
ret = bsearch(&mem_insns_31_opcode, ins_array, ARRAY_SIZE(ins_array), sizeof(ins_array[0]), cmp_offset);
sizeof(arithmetic_ins_op_31[0]), cmp_offset);
sizeof(arithmetic_two_ops[0]), cmp_offset);
qsort(di->sorted, n, sizeof(di->sorted[0]), cmp_offset);
vr = bsearch(&vi, di->sorted, di->nr_entries, sizeof(di->sorted[0]), cmp_offset);