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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102046] [12 Regression] ICE: tree check:
 expected class 'type', have 'exceptional' (error_mark) in
 useless_type_conversion_p, at gimple-expr.c:87 with -O3 -march=btver2
Date: Tue, 24 Aug 2021 22:00:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102046

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
              else if (!useless_type_conversion_p (elt_t, TREE_TYPE (elt_v)=
))
                {
                  error ("incorrect type of vector CONSTRUCTOR elements");
                  debug_generic_stmt (rhs1);
                  return true;
                }

  _16 =3D {_2, _12};

Maybe introduced by r12-1294.=