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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112711] [14 Regression] SRA seems to ignore
 writes when using __builtin_assume_aligned
Date: Sat, 25 Nov 2023 20:04:16 +0000
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X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: alias, wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112711

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-11-25
   Target Milestone|---                         |14.0
            Summary|[14 Regression] possibly    |[14 Regression] SRA seems
                   |wrong code in bswap32(int)  |to ignore writes when using
                   |on llvm-16.0.6 test suite   |__builtin_assume_aligned
          Component|target                      |tree-optimization
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |alias

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
It has nothing to do with __builtin_bswap32 really but rather
__builtin_assume_aligned and the memcpy.

SRA does not detect:
  _9 =3D __builtin_assume_aligned (&data, 1);
  MEM <unsigned int> [(char * {ref-all})_9] =3D 3451308718;
  _1 =3D data[0];


The store to _9 as touching data ...=