[Bug tree-optimization/126589] [13/14/15/16/17 Regression] Complex-mul vectorisation not honoring signed zeros

"tnfchris at gcc dot gnu.org via Gcc-bugs" <[email protected]> Mon, 03 Aug 2026 12:12:48 +0000

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D126589

Tamar Christina <tnfchris at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2026-08-03
           Assignee|unassigned at gcc dot gnu.org      |tnfchris at gcc dot=
 gnu.org
     Ever confirmed|0                           |1
             Target|                            |aarch64

--- Comment #1 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
This is a target expansion bug.

The vectorizer does not know it's going to be emulated using a 0 seed.

Testing patch.=