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Re: compiling linux kernels with GCC 3.0
- To: Joe Buck <jbuck at synopsys dot COM>
- Subject: Re: compiling linux kernels with GCC 3.0
- From: Paolo Carlini <pcarlini at unitus dot it>
- Date: Thu, 11 Oct 2001 01:18:33 +0200
- CC: gcc at gcc dot gnu dot org
- Organization: Universita' della Tuscia
- References: <200110102222.PAA08822@atrus.synopsys.com>
- Reply-To: pcarlini at unitus dot it
Joe Buck wrote:
> for a discussion, test conditions, caveats, etc. To jump straight to
> the significant results:
>
> http://www.suse.de/~aj/SPEC/reference/gcc-2.95.3.SuSE/CINT2000.048.html
> http://www.suse.de/~aj/SPEC/reference/gcc-3.0/CINT2000.186.html
> http://www.suse.de/~aj/SPEC/reference/gcc-3.0.1/CINT2000.185.html
>
> The trend is right, 2.95.3 < 3.0 < 3.0.1.
>
> The test platform is an AMD Athlon 1.133Ghz box.
First, thanks for the interesting summary.
One question: do you have reasons to believe that the same (nice!) trends holds
true also for Intel cpu's?
I'm asking this because recently I noticed some disappointing performance
regressions due to partial register stalls. For instance:
http://gcc.gnu.org/ml/gcc/2001-09/msg00217.html
Privately, Jan Hubicka explained that partial register issues are some times
very difficult to sort out on the current x86 backend.
Thanks,
Paolo.