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Re: GCC 4.1.0 Released
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.
> 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.