[Bug tree-optimization/101573] uninitialized warning could not appear correclty in -O0 optimisation level

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101573

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |msebor at gcc dot gnu.org
          Component|c                           |tree-optimization
             Blocks|                            |24639
           Keywords|                            |diagnostic
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement
   Last reconfirmed|                            |2021-07-22
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
-O0 doesn't run the flow-sensitive uninit part, so that's expected.  What we
could improve is walk PHIs and look at fallthru edges PHI uses.

I have a patch doing that.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
[Bug 24639] [meta-bug] bug to track all Wuninitialized issues