Quoting Bernd Schmidt <bernds_cb1@t-online.de>:
>> 2009-02-24  J"orn Rennecke  <joern.rennecke@arc.com>
>>
>>         * loop-doloop.c (doloop_valid_p): Rename to:
>>         (validize_doloop).  Try to fix up loops with conditons for infinite
>>         looping by enclosing them in an outer loop.
>>         Changed caller.
>>         (add_test): Add new parameter edgep.  Changed caller.
>
> This looks interesting, but unless I read the svn log incorrectly, the
> arc branches have all patches applied in a single commit, which isn't
> exactly useful.  Do you have them broken-out somewhere?

I've appended the sliced & diced diff - not separately tested, though.
Please let me know if there are any problems.