On Mon, Aug 08, 2011 at 11:25:56AM +0200, Mike Hommey wrote: > On Fri, Aug 05, 2011 at 09:32:05AM +0200, Richard Guenther wrote: > > Well, but unless your training coverage is 100% all parts with no coverage > > get optimized with -O3 instead of -Os. And I bet coverage for mozilla > > isn't even close to 100%. Thus I think recommending -O3 for FDO is > > usually a bad idea. > > Experience shows that this isn't true. > > > So - did you try FDO with -O2? ;) > > Leads to roughly the same as -O3+FDO. The apk is also the same size, as > well as individual libraries.
Actually, I have to revise my result, I had forgottent to change the optimization level for the javascript engine. The apk and library sizes are still similar, but the performance is actually slower than both -O3+PGO and -Os. Mike
