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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 02:04:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109502

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> SLP transforms:
>=20
>   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;
>=20
> To:
>=20
>   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;
>=20

If anything there is a missing, a negative after the
reduc_plus (or before) when it translates the bools comparisons into vector
comparisons.=