On 20 Oct 2002, Atlantic Tech Solutions wrote: >Thanks for the succinct and very clear explanation. I have come to many >of the same conclusions. There are few apps which do benefit from >-march=i686, but if one aims to increase performance for a given >application other compiler optimizations will have a more dramatic >benefit.
I agree. Also, the best optimizations will vary greatly from application to application, etc. Another problem is knowing what optimizations are actually stable enough to use regularly. I've never trusted a lot of gcc's optimizations personally. Perhaps it has improved over the last few years a lot in this area though. >Apps which use lots of floating point code can <<sometimes>> benefit >from options like -ffast-math. My short bit of testing shows >-march=athlon or -march=athlon-xp makes a bigger difference on >8.0(because of gcc 3.2), than variations on x86. Interesting... Perhaps an athlon optimized Mesa would be nice. ;o) >Simply upgrading from gcc 2.96 from 3.2 probably gains the most. :O Yeah, that probably gives the largest benefit for the general case. TTYL -- Mike A. Harris ftp://people.redhat.com/mharris OS Systems Engineer XFree86 maintainer Red Hat Inc.
