-fprofile-generate and -fprofile-use

[girish vaitheeswaran]

This is on Intel Pentium4 on Linux.

-girish

--- Janis Johnson <janis187@us.ibm.com> wrote:

> On Wed, Jul 20, 2005 at 10:45:01AM -0700, girish
> vaitheeswaran wrote:
> > > --- Steven Bosscher <stevenb@suse.de> wrote:
> > > 
> > > > On Wednesday 20 July 2005 18:53, girish
> vaitheeswaran wrote:
> > > > > I am seeing a 20% slowdown with feedback
> optimization.
> > > > > Does anyone have any thoughts on this.
> > > > 
> > > > My first thought is that you should probably
> first
> > > > tell what compiler
> > > > you are using.
> >
> > I am using gcc 3.4.3
> > -girish
> 
> Which platform?  I've seen slower code for
> profile-directed optimizations
> on powerpc64-linux with GCC 4.0 and mainline.  It's
> a bug, but I haven't
> looked into it enough to provide a small test case
> for a problem report.
> 
> Janis
>