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Re: -fprofile-generate and -fprofile-use
- From: Janis Johnson <janis187 at us dot ibm dot com>
- To: girish vaitheeswaran <girish_vaithees at yahoo dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Wed, 20 Jul 2005 12:00:27 -0700
- Subject: Re: -fprofile-generate and -fprofile-use
- References: <20050720174501.16577.qmail@web80001.mail.yahoo.com>
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