query regarding iterating DOM on jump threading oppurtunities

["Ramana Radhakrishnan" <ramana dot r at gmail dot com>]

Hi Jeffrey,

I'm seeing a few performance regressions similar to
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32306 and
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33315 in a port where I'm
working off the 4.3 branch. These regressions are caused by the
decision to stop iterating DOM on identifying jump threading
oppurtunities and splitting up VRP into a separate pass based on your
patch at http://gcc.gnu.org/ml/gcc-patches/2006-02/msg00586.html and
as described by Richard here
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32306#c7.

I'm going to try a quick experiment by re-running DOM if jump
threading is turned on in the 4.3 branch. I know there are a number of
changes I need to do and I'm looking into them. I wanted to check back
if you still had any record of the small number of performance
regressions that you mention in the posting of the afore mentioned
patch.

Thanks,
Ramana