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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/96133] [10 Regression] x86-64 gcc 10.1 using
 -O3 leads to wrong calculation since r10-1882-g831e688af50c5f77
Date: Fri, 10 Jul 2020 10:38:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96133

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:8614106f121db118f9db260b9949883485d0bbf6

commit r10-8455-g8614106f121db118f9db260b9949883485d0bbf6
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jul 9 16:03:45 2020 +0200

    fix constant folding from array CTORs

    This fixes the case where we try to fold a read from an
    array initalizer and happen to cross the boundary of
    multiple CTORs which isn't really supported.  For the
    interesting cases like the testcase we actually handle
    the folding by encoding the whole initializer.

    2020-07-10  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/96133
            * gimple-fold.c (fold_array_ctor_reference): Do not
            recurse to folding a CTOR that does not fully cover the
            asked for object.

            * gcc.dg/torture/pr96133.c: New testcase.

    (cherry picked from commit 6e41c27bf549d957eb399d39d7d0c213f8733351)=