Their web pages primarily talk about the 64-bit performance on AMD
systems. Maybe they aren't well tuned for 32-bit performance and/or
Intel parts. Anyways, from what Daniel Berlin mentioned, it may be
that
the tree-ssa stuff in gcc4.x has negated much of their earlier
advantage.
I would not be surprised if they kick the crap out of us when it comes
to numerical fortran or something, but for regular c code, i'd not
expect more than 10-20% difference, max.
At least there is some comparison for fortran (amd,intel,32,64)
http://www.polyhedron.co.uk/compare/linux/f77bench_AMD.html
http://www.polyhedron.co.uk/compare/linux/f77bench_p4.html
http://www.polyhedron.co.uk/compare/linux/f90bench_AMD.html
http://www.polyhedron.co.uk/compare/linux/f90bench_p4.html
there's no g77 on te first graph and f90 graphs, but NAG translates
fortran to C and uses gcc for code generation, and as it is faster than
g77 in f77bench_p4, that is a worthwhile comparison.
Cheers,
Joost
