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Re: GCC trunk SPEC2000 performance
- From: Andreas Jaeger <aj at suse dot de>
- To: David Edelsohn <dje at watson dot ibm dot com>
- Cc: Mark Mitchell <mark at codesourcery dot com>, gcc at gcc dot gnu dot org
- Date: Thu, 20 Jun 2002 07:52:17 +0200
- Subject: Re: GCC trunk SPEC2000 performance
- References: <200206200243.WAA23358@makai.watson.ibm.com>
David Edelsohn <dje@watson.ibm.com> writes:
> To avoid the argument that GCC 3.2 performance regressions were
> reported too late in the release cycle, does anyone know why the graphs on
> Andreas Jaeger's SPEC CPU2000 performance tracking page show:
>
> 1) 181.mcf, 254.gap, 172.mgrid, performance has fallen precipitously. The
> trunk produces worse code than GCC 2.95, 3.0, and 3.1.
My pages contain the diffs between single runs so if somebody likes to
investigate...
> 2) "peak" (-O3 -funroll-all-loops -fprefetch=loop-arrays) produces slower
> code than base (-O2) for many tests.
And one more point: 301.apsi does not build on peak at all.
Andreas
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
http://www.suse.de/~aj