Wow!

Daniel Berlin dberlin@dberlin.org
Mon Jul 2 18:37:00 GMT 2007


I'm curious if it was the pre/fre changes.  can you try -fno-tree-pre
and -fno-tree-fre and see if it slows down again?

On 7/2/07, Uros Bizjak <ubizjak@gmail.com> wrote:
> Hello!
>
> It is worth noticing that latest changes to gcc brought more than 75%
> speed-up on Polyhedron aermod.f90 benchmark [1]. I can confirm this on
> 32bit nocona, and double-checked on 64bit core2:
>
> gcc -O3 -funroll-loops -ftree-vectorize -ffast-math:
>
> (GCC) 4.3.0 20070622 : 0m33.530s
> (GCC) 4.3.0 20070702 : 0m11.805s
>
> [1]:
> http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html
>
> Uros.
>



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