Re: Massive performance regression from switching to gcc 4.5

["Richard B. Kreckel" <kreckel at ginac dot de>]

Jan Hubicka wrote:
> GiNaC indeed shows interesting behaviour.  Just the first test on 4.3 is:
> timing commutative expansion and substitution....
>         size:   100     200     400     800
>         time/s: 0.064   0.30    1.4     6.2
>
> for 4.5
> timing commutative expansion and substitution....
>         size:   100     200     400     800
>         time/s: 0.080   0.36    1.6     7.4
> and for 4.6
> timing commutative expansion and substitution....
>         size:   100     200     400     800
>         time/s: 0.076   0.37    1.7     8.2
>
> I assume that the numbers are times in second, so it is indeed not good.  Can I
> easilly run the individual tests by hand?  Do you have any idea what is going
> wrong here?

Yes, one can run the individual tests by hand. And it should suffice to 
focus on the first one, as you did. All the follow-up regressions are 
most likely due to the same problem. And no, I have no idea what's up yet.

  -richy.
--
Richard B. Kreckel
<http://www.ginac.de/~kreckel/>