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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/40635] [12 Regression] bogus name and
 location in 'may be used uninitialized' warning
Date: Wed, 12 Jun 2024 12:33:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D40635

--- Comment #29 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:844ff32c04a4e36bf69f3878634d9f50aec3a332

commit r12-10553-g844ff32c04a4e36bf69f3878634d9f50aec3a332
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Dec 5 16:03:21 2022 +0100

    middle-end/40635 - SSA update losing PHI arg loations

    The following fixes an issue where SSA update loses PHI argument
    locations when updating PHI nodes it didn't create as part of the
    SSA update.  For the case where the reaching def is the same as
    the current argument opt to do nothing and for the case where the
    PHI argument already has a location keep that (that's an indication
    the PHI node wasn't created as part of the update SSA process).

            PR middle-end/40635
            * tree-into-ssa.cc (rewrite_update_phi_arguments): Only
            update the argument when the reaching definition is different
            from the current argument.  Keep an existing argument
            location.

            * gcc.dg/uninit-pr40635.c: New testcase.

    (cherry picked from commit 0d14720f93a8139a7f234b2762c361e8e5da99cc)=