[Bug tree-optimization/107919] Possibly false-positive "maybe-uninitialized" with GCC 12 on complex variant-variant-tuple-unique_ptr types

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107919

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:9500877d05c56cef7bfbdcecaab3b1af2610bff3

commit r13-4406-g9500877d05c56cef7bfbdcecaab3b1af2610bff3
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Nov 30 10:55:03 2022 +0100

    tree-optimization/107919 - uninit diagnostic predicate simplification

    We fail to simplify

            ((_145 != 0B) AND (_531 == 2) AND (_109 == 0))
            OR ((NOT (_145 != 0B)) AND (_531 == 2) AND (_109 == 0))
            OR ((NOT (_531 == 2)) AND (_109 == 0))

    because the existing simplification of !A && B || A && B is implemented
    too simplistic.  The following re-implements that which fixes the
    bogus uninit diagnostic when using -O1 but not yet at -O2.

            PR tree-optimization/107919
            * gimple-predicate-analysis.cc (predicate::simplify_2):
            Handle predicates of arbitrary length.

            * g++.dg/warn/Wuninitialized-pr107919-1.C: New testcase.