Re: 2.5X slowdown with g++ 3.4 (probably 3.3 also) over 3.2

[P Ruetz]

Thanks for the response!  See below.

"Maurizio Loreti" <mlo@foobar.it> wrote in message 
rmy85pm5mb.fsf@mlinux.pd.infn.it">news:rmy85pm5mb.fsf@mlinux.pd.infn.it...
> what comes to mind, is that a version of g++ generates code optimized
> for a given target (say, i686) where the others no...

I was thinking it could be something like this.  But I suspected they 
wouldn't make a big change from 3.2 to 3.3/3.4.  I will look again to make 
sure.

or that the
> standard libraries (libstdc++, glibc) were generated for different
> cpus...  or that a version of g++ uses different floating point
> options that the others...  did you ./configure and make yourself to
> build gcc and/or libraries?

No, I downloaded the package from cygwin, so it came complete (and 
presumably correct).  I tried some time ago with 3.3 (and again today) and 
got the same results.

Peter