[Bug tree-optimization/126453] phiopt should combine phis in some cases

"pinskia at gcc dot gnu.org via Gcc-bugs" <[email protected]> Tue, 28 Jul 2026 22:33:43 +0000

Newsgroups	gmane.comp.gcc.bugs
Message-ID	<[email protected]/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126453

Drea Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2026-07-28

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
This also should be after factoring too.  To begin with I am just going to
handle casting from bool to integer. And then add BIT_NOT before the cast also
and NEGATIVE after the cast; that is 1:0->0:1 and 1:0->-1:0/0:-1. This should
allow to catch most cases in the end I think.