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Re: 27% regression of gcc 4.3 performance on cpu2k6/calculix
- From: "H. J. Lu" <hjl at lucon dot org>
- To: Grigory Zagorodnev <grigory_zagorodnev at linux dot intel dot com>
- Cc: Toon Moene <toon at moene dot indiv dot nluug dot nl>, gcc mailing list <gcc at gcc dot gnu dot org>, Diego Novillo <dnovillo at redhat dot com>
- Date: Thu, 18 Jan 2007 09:32:27 -0800
- Subject: Re: 27% regression of gcc 4.3 performance on cpu2k6/calculix
- References: <45ABE866.4000008@moene.indiv.nluug.nl> <45ACF7CE.9090108@linux.intel.com>
On Tue, Jan 16, 2007 at 07:05:34PM +0300, Grigory Zagorodnev wrote:
> Toon Moene wrote:
> >Calculix is a combined C/Fortran program. Did you try to compile the
> >Fortran parts with --param max-aliased-vops=<something higher than the
> >default 50> ?
> Right, calculix is a combined program. Gprof says the regression is in
> e_c3d routine which is 1k lines of Fortran code.
>
> Various max-aliased-vops give no difference for calculix:
>
Is that possible to extract a smaller testcase?
H.J.