Re: Optimization

[Brian D. McGrew <brian at visionpro dot com>]

so what flag can I give gcc to tell it to inline everything, or as much 
as possible???  Our code already takes 16 hours to build on sparc, 
using -O2 -g -finline-limit=2750.

I've profiled the code but I'm not exactly sure what to do with it now 
that I've got it.  Someone sail something about gproff but I don't know 
exactly what I'm looking for.

-brian

Brian D. McGrew		{ brian@doubledimension.com || 
pacemakertaker@yahoo.com }
--
> YOU!  Off my planet!
On Apr 27, 2004, at 8:02 AM, Ian Lance Taylor wrote:

> Brian D.McGrew <brian@visionpro.com> writes:
>
> > As for the -O0 flag, I posted the wrong trace file.  In the release
> > trees, we use -O2 -g -finline-limit=2750 on all versions, all
> > platforms.  My bad.
>
> I doubt this is your problem, but -finline-limit will have a different
> effect on i386 and SPARC, since the SPARC will normally require more
> instructions.  Although -finline-limit is expressed in terms of
> pseudo-instructions, gcc pseudo-instructions are different on i386 and
> SPARC.  It would normally be appropriate to use a larger
> -finline-limit on SPARC.
>
> As I say, I doubt this is your problem.  I have no idea what your
> problem is.  It's fairly unlikely that anybody can tell you what is
> wrong here.
>
> As was already suggested, try using a profiler to see where the hot
> spots are in your slow version.  Perhaps gcc is egregiously
> miscompiling something on SPARC.
>
> Ian