Byoungyoung Lee <lifeasag...@gmail.com> writes: > If the optimization options provided in a different way, > the same source codes would be compiled into different executables. > > In the different executables, > the register allocation or instruction orders might be easily changed, > but I think that's not that big change. > What I'd like to do is to make their CFG different, while their impact > on executing performance is reasonable. > > I'm reading through the compiler books and gcc internal documentations, > but it's really hard for me to pin point what I really need to read > and understand. > > So, my question is what kind of optimizing options in gcc could be > used to do such jobs ? > or would you recommend good references for this ?
Sorry, I don't understand the question. Are you asking what gcc options will produce a different CFG? If so, this question would be better asked on gcc-h...@gcc.gnu.org. One answer is that you will get a slightly different CFG from options like -funroll-loops. In general there are a number of options which could change the CFG. But I'm not sure why you are asking the question. Ian
