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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103253] [12 Regression] ICE: Segmentation
 fault (in convert_mult_to_fma or in vect_recog_mask_conversion_pattern) since
 r12-5129-g8ed62c929c7c4462
Date: Tue, 16 Nov 2021 09:02:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103253

--- Comment #5 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Looks like the RPO pass is causing match.pd to simply

  vect_iftmp.10_41 =3D vect__1.9_38 * vect_cst__40;
  vect_iftmp.10_42 =3D vect__1.9_39 * vect_cst__40;
  iftmp.0_8 =3D _1 * 2.0e+0;
  mask_patt_19.11_44 =3D vect_vec_iv_.8_36 !=3D vect_cst__43;
  mask_patt_20.12_45 =3D [vec_unpack_lo_expr] mask_patt_19.11_44;
  mask_patt_20.12_46 =3D [vec_unpack_hi_expr] mask_patt_19.11_44;
  vect_patt_21.13_48 =3D VEC_COND_EXPR <mask_patt_20.12_45, vect_iftmp.10_4=
1,
vect_cst__47>;
  vect_patt_21.13_49 =3D VEC_COND_EXPR <mask_patt_20.12_46, vect_iftmp.10_4=
2,
vect_cst__47>;

into
  _54 =3D .COND_MUL (mask_patt_20.12_45, vect__1.9_38, { 2.0e+0, 2.0e+0, 2.=
0e+0,
2.0e+0, 2.0e+0, 2.0e+0, 2.0e+0, 2.0e+0 }, { 1.0e+0, 1.0e+0, 1.0e+0, 1.0e+0,
1.0e+0, 1.0e+0, 1.0e+0, 1.0e+0 });
  vect_patt_21.13_48 =3D _54;
  _55 =3D .COND_MUL (mask_patt_20.12_46, vect__1.9_39, { 2.0e+0, 2.0e+0, 2.=
0e+0,
2.0e+0, 2.0e+0, 2.0e+0, 2.0e+0, 2.0e+0 }, { 1.0e+0, 1.0e+0, 1.0e+0, 1.0e+0,
1.0e+0, 1.0e+0, 1.0e+0, 1.0e+0 });
  vect_patt_21.13_49 =3D _55;
  iftmp.0_3 =3D i_10 !=3D 0 ? iftmp.0_8 : 1.0e+0;

which is perfectly valid and much simpler, so need to see why DCE6 mangles
this.=