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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/109502] [12/13 Regression] wrong code with -O
 -ftree-vectorize -fvect-cost-model=unlimited on aarch64
Date: Fri, 14 Apr 2023 02:03:39 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109502

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |tree-optimization
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-04-14

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
SLP transforms:

  g.0_1 =3D g;
  _2 =3D g.0_1 =3D=3D 0;
  a_7 =3D (unsigned int) _2;
  _3 =3D a_7 % 6;
  _4 =3D _3 =3D=3D 0;
  _5 =3D (unsigned int) _4;
  a_8 =3D _5 + a_7;

To:

  g.0_1 =3D g;
  _2 =3D g.0_1 =3D=3D 0;
  a_7 =3D (unsigned int) _2;
  _3 =3D a_7 % 6;
  _15 =3D {_3, g.0_1};
  mask__4.4_16 =3D { 0, 0 } =3D=3D _15;
  vect__5.5_19 =3D VIEW_CONVERT_EXPR<vector(2) unsigned int>(mask__4.4_16);
  _17 =3D BIT_FIELD_REF <mask__4.4_16, 32, 0>;
  _18 =3D (bool) _17;
  _4 =3D _3 =3D=3D 0;
  _5 =3D (unsigned int) _18;
  _20 =3D .REDUC_PLUS (vect__5.5_19);
  a_8 =3D _20;

Which is wrong. The if anything there is a missing - missing after the
reduc_plus (or before) when it translates the bools comparisons into vector
comparisons.=