On 11/6/05, Robert Dewar <[EMAIL PROTECTED]> wrote: > Giovanni Bajo wrote: > > > I believe you are missing my point. What is the GCC command line option for > > "try to optimize as best as you can, please, I don't care compiletime"? I > > believe that should be -O3. Otherwise let's make -O4. Or -O666. The only > > real > > argument I heard till now is that -funroll-loops isn't valuable without > > profile > > feedback. My experience is that it isn't true, I for sure use it for profit > > in > > my code. But it looks like the only argument that could make a difference is > > SPEC, and SPEC is not freely available. So I'd love if someone could > > SPEC -funroll-loops for me. > > It is not at all the case that SPEC is the only good argument, in fact > SPEC on its own is a bad argument. Much more important is impact on real > life applications, so your data point that it makes a significant difference > for your application is more interesting than SPEC marks. When it comes > to GCC, we are more interested in performance than good SPEC figures!
Of course SPEC consists of real life applications. Whether it is a good representation for todays real life applications is another question, but it certainly is a very good set of tests. Richard.
