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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



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