[PATCH]: RTL iterators

[Daniel Berlin]

On Fri, 10 Aug 2001, Mark Mitchell wrote:

>
>
> --On Thursday, August 09, 2001 10:06:30 PM -0400 Daniel Berlin
> <dan@cgsoftware.com> wrote:
>
> > Richard Henderson <rth@redhat.com> writes:
> >
> >> On Thu, Aug 09, 2001 at 05:37:51PM -0400, Daniel Berlin wrote:
> >> > Only supports RTL that is 20 levels deep, but i've never seen one more
> >>> than 3 levels deep, so i don't think this is a problem.
> >>
> >> What's wrong with for_each_rtx?  No max nesting level
> >> (you _do_ get more than 20 -- sometimes hundreds), and
> >> doesn't expand to obnoxious amounts of inline code.
>
> I like for_each_rtx, but of course I wrote it. :-)
>
> If anyone is concerned about the performance, or the pain of the
> callbacks, you could always make a macro-ized version where the code
> to plug in where the function goes now was a macro argument.

I effectively did just this, in a slightly different way (changing it so
you drove the iteration, rather than *it* driving the iteration, and
requiring you to tell it when to stop, etc).
I'm told it's not useful by Richard, which I find odd.
But i'll just rewrite for_each_rtx as a macro, maybe *that* will be more
useful somehow.

>
> But, you could also just go program in Lisp for a while; when you
> come back you'll be all happy about little tiny functions. :-)
>
> --
> Mark Mitchell                mark@codesourcery.com
> CodeSourcery, LLC            http://www.codesourcery.com
>