Re: 3.4 / 3.5 / tree-ssa comparisons

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Apr 4, 2004, at 09:57, Richard Guenther wrote:
> Runtime is 7.73s/it compared to 7.64s/it beforer.
> So it's not helping, but instead pessimizing slightly!?

This does not make sense because I looked into the tree
dumps for this code and it looked like it would improve
it and not hurt it.  But there is another patch which is
in the works which should also help but only in combination
with the patch which you tested.

Also I was still getting cast removals which should make SRA
do its work, but we would have to run aliasing again and do
DOM another time after this second aliasing run so the compile
time will/should go up.

Also I did a compile time comparison with and without this
cast patch on PR8361, and the patch was a win in compile
time by 2 seconds out of a run of 40 seconds so an
improvement of 5%, maybe adding the leafy patch you will
see that this patch helps more than what you have looked
at so far.

Thanks,
Andrew Pinski