https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61409
--- Comment #23 from Jeffrey A. Law <law at redhat dot com> --- Sorry, I can't remember if I meant 9->5 or 9->6 at this point :-) I need to refamiliarize myself with this stuff again to make sure I've got the basic concepts before reviewing the patch. But you can probably see now why I said there was some seriously powerful, but dense code in here that I'd like to be able to re-use elsewhere to prune other false positive may-be warnings.
