On Thursday 23 November 2006 12:58, Jan Jitse Venselaar wrote: > ... have you benchmarked in any way the effect of all these > optimizations on the programs you run? You basically do -Os and then turn > almost everything on which differs -O2 from -Os, negating the size > difference, plus some extra very experimental flags, which might increase > or decrease performance (sorry, but GCC works that way, extra > optimizations could actually be pessimizations), and probably break some > programs.
You may have seen some discussion of compiler optimisations on this list, in which a set of flags have been offered and some people have played with them. I thought I'd have a go, and was reporting what I'd found. In light of what you say, I think I'll just go back to a simple set of flags (-march=k8 -Os -pipe) and leave it at that. And no, I hadn't noticed any performance improvement with all those flags - another good reason for reverting. Better, probably. Thanks for the advice. -- Rgds Peter -- [email protected] mailing list
