A prototype loop reverser for the scalarizer

[Paul Thomas]

Daniel and Steven,

Once again, thanks for the illuminating correspondence; you can put the 
daggers away now!

>
> It is of course, up to whoever implements it to implement it where
> they want, as long as there are people willing to approve it.  I can
> only offer an opinion as to where I would do it, and why

That is, of course, why I submitted the patch to the list and invited 
comments as to whether or not I should proceed.  It seems to me:
(i) That the reverser in the scalarizer is but a small thing - the need 
is easily recognized in the existing dependency analysis and is simply 
dealt wih by the scalarizer.
(ii) Loop interchange in the scalarizer ought to work - all the 
requisite code is there; it just needs debugging.
(iii) A natural dividing line, between what is desirable to do in the 
frontend and what should be left to the middle-end machinery, is that of 
any comparative analysis of alternative branches.
(iv) I should find out more about the middle-end!

Best regards

Paul