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27% regression of gcc 4.3 performance on cpu2k6/calculix
- From: Toon Moene <toon at moene dot indiv dot nluug dot nl>
- To: grigory_zagorodnev at linux dot intel dot com
- Cc: gcc mailing list <gcc at gcc dot gnu dot org>, Diego Novillo <dnovillo at redhat dot com>
- Date: Mon, 15 Jan 2007 21:47:34 +0100
- Subject: 27% regression of gcc 4.3 performance on cpu2k6/calculix
Grigory,
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> ?
Diego up'd the default from 10 to 50 because one (or more) of the
(Fortran) Polyhedron benchmarks showed a dramatic performance regression.
(Note: I've sent Diego a 900 line Fortran subroutine that crashes the
compiler if you give it --param max-aliased-vops=200 or higher).
Kind regards,
--
Toon Moene - e-mail: toon@moene.indiv.nluug.nl - phone: +31 346 214290
Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
A maintainer of GNU Fortran: http://gcc.gnu.org/fortran/
Who's working on GNU Fortran:
http://gcc.gnu.org/ml/gcc/2007-01/msg00059.html