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Re: SPEC CFP2000 and polyhedron runtime scores dropped from 13. november onwards

From: "Richard Guenther" <richard dot guenther at gmail dot com>
To: "Uros Bizjak" <ubizjak at gmail dot com>
Cc: "GCC Development" <gcc at gcc dot gnu dot org>, "Daniel Berlin" <dannyb at google dot com>
Date: Fri, 1 Dec 2006 17:17:32 +0100
Subject: Re: SPEC CFP2000 and polyhedron runtime scores dropped from 13. november onwards
References: <5787cf470612010744nef4342euc1d4a2ffc74f5f45@mail.gmail.com>

On 12/1/06, Uros Bizjak <ubizjak@gmail.com> wrote:

Hello!

At least on x86_64 and i686 SPEC score [1] and polyhedron [2] scores
dropped noticeably. For SPEC benchmarks, mgrid, galgel, ammp and
sixtrack tests are affected and for polygedron, ac (second regression
in the peak) and protein (?) regressed in that time frame.

[1] http://www.suse.de/~aj/SPEC/amd64/CFP/summary-britten/recent.html
[2] http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html

Does anybody have any idea what is going on there?


It correlates with the PPRE introduction (enabled at -O3 only) which might
increase register pressure, but also improves Polyhedron rnflow a lot.

Richard.

Follow-Ups:
- Re: SPEC CFP2000 and polyhedron runtime scores dropped from 13. november onwards
  - From: Daniel Berlin

References:
- SPEC CFP2000 and polyhedron runtime scores dropped from 13. november onwards
  - From: Uros Bizjak

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