[PATCH] Convert strlen pass from evrp to ranger.

[Jeff Law]

On 10/8/2021 9:12 AM, Aldy Hernandez via Gcc-patches wrote:
> The following patch converts the strlen pass from evrp to ranger,
> leaving DOM as the last remaining user.
So is there any reason why we can't convert DOM as well?   DOM's use of 
EVRP is pretty limited.  You've mentioned FP bits before, but my 
recollection is those are not part of the EVRP analysis DOM uses. Hell, 
give me a little guidance and I'll do the work...

>
> No additional cleanups have been done.  For example, the strlen pass
> still has uses of VR_ANTI_RANGE, and the sprintf still passes around
> pairs of integers instead of using a proper range.  Fixing this
> could further improve these passes.
>
> As a further enhancement, if the relevant maintainers deem useful,
> the domwalk could be removed from strlen.  That is, unless the pass
> needs it for something else.
The dom walk was strictly for the benefit of EVRP when it was added.  So 
I think it can get zapped once the pass is converted.

Jeff