A prototype loop reverser for the scalarizer

[Victor Kaplansky]

> > My pet peeve (front end doesn't give necessary info to middle end):
> >
> >        DIMENSION A(100)
> >        READ, A
> >        PRINT*, SUM(A)
> >        END
> >
> > This won't get vectorized, because, by the time the vectorizer sees
this
> > code, it already has been scalarized into a loop with a definite order
> > of summation, contrary to the coder's intent ;-)
>
> Not even on the autovect branch?  Or are reductions on the trunk already,
too?
>

Reductions will be put into mainline as soon as 4.3 is open.
-- Victor