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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/98908] [11 Regression] arithmetic involving
 struct members into operating on the entire struct fails at -O3
Date: Fri, 03 Sep 2021 01:38:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98908

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |11.2.0
      Known to work|                            |10.3.0, 12.0

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
How this was fixed on the trunk was SLP is now able to do:
  _8 =3D {_1, _3};
  vect__2.4_9 =3D _8 & { 254, 128 };
Where it only did the store SLP and not the & before.

SLP does it because we know vect-lowering will change it to:
  _7 =3D VIEW_CONVERT_EXPR<short unsigned int>(_8);
  _6 =3D _7 & 33022;
  _11 =3D VIEW_CONVERT_EXPR<vector(2) unsigned char>(_6);

Next time when you file a bug please add what options you are using.=