[Bug tree-optimization/106883] SLSR may generate signed wrap

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106883

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2) 
> As said, it would be nice to not needing to always do this.  Which
> means possibly having insert_initializers create an unsigned initializer
> and replace_rhs_if_not_dup (and elsewhere) deal with type mismatches by
> promoting the replaced computation as well.

I did this in the end. There was actually not many changes needed in the end.
Most of the support is there even. Plus using gimple_convert made this easy.
Only create_add_on_incoming_edge needed some extra handling but the support for
adding a cast was already there so it was not hard.

Also I have a patch to add rewrite_to_defined_unconditional to
create_add_on_incoming_edge which I will be doing before the big patch. It is a
few lines long.