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Re: What to do about compile time slowdowns for 4.1?
- From: Joe Buck <Joe dot Buck at synopsys dot COM>
- To: Steven Bosscher <stevenb at suse dot de>
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 29 Aug 2005 16:26:16 -0700
- Subject: Re: What to do about compile time slowdowns for 4.1?
- References: <200508300020.11285.stevenb@suse.de>
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.