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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98774] gcc -O3 does not vectorize some
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Date: Tue, 14 Sep 2021 18:28:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98774

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the trunk (without -ffast-math), the perms are done too early:
  vect__5.32_53 =3D VEC_PERM_EXPR <vect__2.31_52, vect__2.31_52, { 1, 1 }>;
  vect__5.33_54 =3D VEC_PERM_EXPR <vect__2.31_52, vect__2.31_52, { 1, 0 }>;
  vect__5.34_55 =3D VEC_PERM_EXPR <vect__2.31_52, vect__2.31_52, { 0, 0 }>;
  _3 =3D *mag_9(D);
  _58 =3D {_3, _3};
  vect__4.35_59 =3D vect__5.32_53 * _58;
  vect__4.35_60 =3D vect__5.33_54 * _58;
  vect__4.35_61 =3D vect__5.34_55 * _58;

With -ffast-math:
  a$x_1 =3D *dpos_10(D).x;
  a$y_11 =3D *dpos_10(D).y;
  _49 =3D {a$x_1, a$y_11};
  _35 =3D _49 * _58;
And the PERM is done too early the same way ..=