What to do about compile time slowdowns for 4.1?

[Steven Bosscher]

On Tuesday 30 August 2005 01:26, Joe Buck wrote:
> On Tue, Aug 30, 2005 at 12:20:11AM +0200, Steven Bosscher wrote:
> > We're supposed to be getting closer to a 4.1 release branch, but just
> > like in the past so-many releases we have succeeded again in slowing
> > down GCC, and we've slowed it down a _lot_ compared even to GCC 4.0.
> >
> > Taking SPECint and CSiBE as examples:
> > http://www.suse.de/~aj/SPEC/amd64/CINT/sandbox-britten/Total-time_big.png
> > http://www.inf.u-szeged.hu/csibe/draw-diag.php?draw=sum-ot&basephp=s-i686
> >-linux
> >
> > So for compiling all of SPECint with "-O2 -march=k8" on AMD64, we have
> > slowed down from ~210s for GCC 4.0 to >250s for CVS HEAD.
>
> Unless we trade an improved SPECint score for this slowdown, I'd call
> that an RC bug.  But looking at
>
> http://www.suse.de/~aj/SPEC/amd64/CINT/sandbox-britten/mean-int_big.png
>
> it seems that the scores have gotten worse lately.

That's only because vortex started failing on that day, and that
problem is not yet fixed.

Gr.
Steven