LOOP_HEADER tree code?

[Jeffrey Law]

On Wed, 2006-10-25 at 13:01 -0700, Devang Patel wrote:
> > > However, various optimizer needs to know about this special tree node.
> >
> > not really (not any more than they know about other tree codes that are
> > not interesting for them).
> 
> If we take an example of Jump Threading pass then it needs to  know
> about this tree node and update it properly.
That could get awful ugly.

> 
> So, the passes that maniuplate loop structure need to know about
> LOOP_HEADER and others do not need to worry about LOOP_HEADER.
Passes which do code motions may need to know about it -- they don't
need to update its contents, but they may need to be careful about
how statements are moved around in the presence of a LOOP_HEADER note.

Personally I think this is a bad idea.  

jeff