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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102511] [12 Regression] GCC produces
 incorrect code for -O3: first element of the array is skipped
Date: Tue, 28 Sep 2021 04:24:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102511

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|GCC produces incorrect code |[12 Regression] GCC
                   |for -O3: first element of   |produces incorrect code for
                   |the array is skipped        |-O3: first element of the
                   |                            |array is skipped
   Target Milestone|---                         |12.0
            Version|11.0                        |12.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does not work:
r12-3906-g51018dd1
Works:
r12-3890-gfe2771b2

Note there is one undefined behavior in this code, but it does not matter
really.
The types of arr_15 don't match but after fixing it should fail still.=