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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104595] unvectorized loop due to bool
 condition loaded from memory
Date: Sun, 20 Feb 2022 03:58:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104595

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
IR in the bool case:
  _1 =3D pb[i_13];
  iftmp.0_7 =3D a[i_13];
  iftmp.0_6 =3D b[i_13];
  iftmp.0_3 =3D _1 ? iftmp.0_7 : iftmp.0_6;
  c[i_13] =3D iftmp.0_3;

IR in the char case:
  _1 =3D pc[i_13];
  iftmp.1_7 =3D a[i_13];
  iftmp.1_6 =3D b[i_13];
  iftmp.1_3 =3D _1 =3D=3D 0 ? iftmp.1_6 : iftmp.1_7;
  c[i_13] =3D iftmp.1_3;


details in the bool case:

/app/example.cpp:12:21: note:   =3D=3D> examining statement: iftmp.0_3 =3D =
_1 ?
iftmp.0_7 : iftmp.0_6;
/app/example.cpp:12:21: note:   vect_is_simple_use: operand pb[i_13], type =
of
def: internal
/app/example.cpp:12:21: note:   vect_is_simple_use: vectype vector(32) unsi=
gned
char
/app/example.cpp:11:6: missed:   not vectorized: relevant stmt not supporte=
d:
iftmp.0_3 =3D _1 ? iftmp.0_7 : iftmp.0_6;

details in the char case:
/app/example.cpp:17:21: note:   =3D=3D> examining statement: iftmp.1_3 =3D =
_1 =3D=3D 0 ?
iftmp.1_6 : iftmp.1_7;
/app/example.cpp:17:21: note:   vect_is_simple_use: operand pc[i_13], type =
of
def: internal
/app/example.cpp:17:21: note:   vect_is_simple_use: vectype vector(32) char
/app/example.cpp:17:21: note:   vect_is_simple_use: operand b[i_13], type of
def: internal
/app/example.cpp:17:21: note:   vect_is_simple_use: vectype vector(32) char
/app/example.cpp:17:21: note:   vect_is_simple_use: operand a[i_13], type of
def: internal
/app/example.cpp:17:21: note:   vect_is_simple_use: vectype vector(32) char
/app/example.cpp:17:21: note:   vect_model_simple_cost: inside_cost =3D 4,
prologue_cost =3D 4 .

It should not be too hard to if we had _1 ? : to change it to _1 !=3D 0 rig=
ht?=