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Re: Serious SPEC CPU 2006 FP performance regressions on IA32

From: "Daniel Berlin" <dberlin at dberlin dot org>
To: "Grigory Zagorodnev" <grigory_zagorodnev at linux dot intel dot com>
Cc: "Menezes, Evandro" <evandro dot menezes at amd dot com>, "H. J. Lu" <hjl at lucon dot org>, gcc at gcc dot gnu dot org, ubizjak at gmail dot com, "Dwarak Rajagopal" <dwarak dot rajagopal at txexmtae dot amd dot com>, "Meissner, Michael" <michael dot meissner at amd dot com>
Date: Thu, 11 Jan 2007 20:06:31 -0500
Subject: Re: Serious SPEC CPU 2006 FP performance regressions on IA32
References: <1449F58C868D8D4E9C72945771150BDFDF537C@SAUSEXMB1.amd.com> <45A65775.70301@linux.intel.com>

On 1/11/07, Grigory Zagorodnev <grigory_zagorodnev@linux.intel.com> wrote:

Menezes, Evandro wrote:
> Though not as pronounced, definitely significant.
>

Using binary search I've detected that 30% performance regression of
cpu2006/437.leslie3d benchmark is caused by revision 117891.

http://gcc.gnu.org/viewcvs?view=rev&revision=117891

I assume same commit causes regression of all other benchmarks from
cpu2k6 suite (running others to confirm).


This only affects 4.2, and the only solution would be to try to
backport some of the 4.3 aliasing stuff to 4.2, which i'm not sure is
a great idea.

- Grigory

Follow-Ups:
- Re: Serious SPEC CPU 2006 FP performance regressions on IA32
  - From: H. J. Lu

References:
- Re: Serious SPEC CPU 2006 FP performance regressions on IA32
  - From: Grigory Zagorodnev

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