Re: [RFC] [autovect patch] Implement vectorization hints

[Devang Patel <dpatel at apple dot com>]

On Mar 7, 2005, at 6:36 AM, Richard Henderson wrote:

> > I'm not sure how to tie a pragma to the next language-level loop.
>
> We'll definitely need language-level help for this.  Consider
>
>   #pragma doit
>   for (i = start(); i < end; i++)
>
> where start() expands inline and contains loops.  Either that
> or we have to delay inlining from where we do presently.  Not
> that that would be a bad thing necessarily...

Yup, this is what I meant when I said ..

> >  As soon as one says,
> >     User can put #pragma blah before the loop to give compiler 
> > hints...
> > "before" brings in lot of edge cases.

Another thing to consider is, the use of macros to hide various mundane 
things, e.g.
    #pragma doit
    FOR_EACH_BB (bb)
    {
    }

And FOR_EACH_BB can expand add few expressions just before 'for' loop.

-
Devang