What replaces FOR_EACH_LOOP_FN

[Marek Polacek]

On Wed, Mar 02, 2022 at 10:04:40PM +0000, Gary Oblock via Gcc wrote:
> Guys,
> 
> I've been working on an optimization for quite a bit of time and
> in an attempt to move it to GCC 12 I found that FOR_EACH_LOOP_FN
> no longer exists. I poked around in the archives and tried a Google
> search but found nothing on it.
> 
> It suited my needs and I'd hate to have to rewrite a bunch of stuff.
> What replaces it and how do I use?

Look at this commit:

commit e41ba804ba5f5ca433e09238d561b1b4c8b10985
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Thu Jul 29 22:26:25 2021 -0500

    Use range-based for loops for traversing loops

    This patch follows Martin's suggestion here[1], to support
    range based loop for iterating loops, analogously to the
    patch for vec[2].

    For example, use below range-based for loop

        for (auto loop : loops_list (cfun, 0))

    to replace the previous macro FOR_EACH_LOOP

        FOR_EACH_LOOP (loop, 0)

which shows a number of examples like

-  loop_p loop;
-  FOR_EACH_LOOP_FN (fn, loop, LI_INCLUDE_ROOT)
+  for (auto loop : loops_list (fn, LI_INCLUDE_ROOT))

Marek