I'm trying to figure out optimized code for some network drivers. I'm replacing certain APIs in the code and compare code for each API.

To choose best optimized code, i need to first compile them and then disassemble  the compiled code, where a change in single line would make a significant difference in 

the performance. 

So, my question is how to compile x86 based network drivers  on x86_64 Ubuntu machine. Currently I'm running Ubuntu 14.04. 

Please help me out 

Thanks