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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/107087] [13 Regression]
 bits/stl_algobase.h:431: warning: 'void* __builtin_memcpy(void*, const void*,
 unsigned int)' reading between 8 and 2147483644 bytes from a region of size 4
 [-Wstringop-overread]
Date: Tue, 28 Mar 2023 13:25:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107087

--- Comment #5 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:2b9d76c1af189b918a9970f471e6d2e2c08f7e7d

commit r13-6905-g2b9d76c1af189b918a9970f471e6d2e2c08f7e7d
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Mar 27 15:18:41 2023 +0200

    tree-optimization/107087 - missed CCP after forwprop

    When forwprop simplifies the CFG the 2nd order opportunities by
    exposed degenerate PHIs are not realized.  The following improves
    this by properly tracking executable edges and thus handling this
    for non-cyclic CFGs at least.

    This avoids the bogus diagnostic reported for the testcase in this PR.

            PR tree-optimization/107087
            * tree-ssa-forwprop.cc (pass_forwprop::execute): Track
            executable regions to avoid useless work and to better
            propagate degenerate PHIs.

            * g++.dg/pr107087.C: New testcase.=