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Date: Wed, 08 Feb 2023 11:49:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108688

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |avieira at gcc dot gnu.org,
                   |                            |jakub at gcc dot gnu.org
           Keywords|needs-bisection             |

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Slightly cleaned up:

union U { signed int d : 7; signed int e : 2; } u;
int a, b;

void
foo (void)
{
  for (int i =3D 0; i < 64; i++)
    {
      u.d =3D a;
      u.e ^=3D b;
    }
}

Yes, indeed started with r13-3219-g25413fdb2ac2493321 .=