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Subject: [Bug middle-end/102970] [11/12 Regression] stable_sort uninitialized
 value with -funroll-loops -fno-tree-vectorize since
 r11-2963-gd6a05b494b4b714e
Date: Wed, 03 Nov 2021 14:00:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102970

--- Comment #6 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:1967fd8f2197f2b0334ab0fbc26abc3d9efe56c9

commit r12-4865-g1967fd8f2197f2b0334ab0fbc26abc3d9efe56c9
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Nov 3 13:26:48 2021 +0100

    tree-optimization/102970 - remap cliques when translating over backedges

    The following makes sure to remap (or rather drop for simplicity)
    dependence info encoded in MR_DEPENDENCE_CLIQUE when PRE PHI translation
    translates a reference over a backedge since that ends up interleaving
    two different loop iterations which boils down to two different
    inline copies.

    2021-11-03  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/102970
            * tree-ssa-pre.c (phi_translate_1): Drop clique and base
            when translating a MEM_REF over a backedge.

            * g++.dg/opt/pr102970.C: New testcase.=