This is the mail archive of the
mailing list for the GCC project.
Re: GCC 4.1.0 Released
On Wed, Mar 01, 2006 at 04:05:16PM -0800, H. J. Lu wrote:
> On Wed, Mar 01, 2006 at 03:06:46PM -0800, Mark Mitchell wrote:
> > H. J. Lu wrote:
> > > Here are diffs of "-O2 -mtune=nocona -ffast-math" vs
> > > "-O2 -mtune=generic -ffast-math" on Nocona:
> > A 1.5% performance improvement, while certainly significant for some
> > users, is not worth taking any serious risks on a release branch. The
> You are comparing apply with orange. If a user uses -O2, he/she will
> see much more than that.
I meant to say "comparing apple with orange".
> > The first step is to address regressions on the mainline. I have not
> > myself verified the claim, but there has been a suggestion that there is
> > at least one open regression due to the patch. If there are any known
> > regressions from the patch, it's certainly not eligible for a backport.
> I am only aware of
> and I have a patch. BTW, I don't think it is a real regression, just
> a latent bug. I doubt
> # configure i86-pc-solaris2.10
> # onfigure --with-cpu=i86 i386-pc-solaris2.10
> had ever worked.
> In any case, please CC me any -mtune=generic patch.
Let me rephrase, please CC me any -mtune=generic related bugs.