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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108317] dependent vector field is not causing this to be
 captured for fold expression inside a if constexpr block
Date: Fri, 06 Jan 2023 18:04:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108317

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|#1 SMP PREEMPT_DYNAMIC Sat, |
                   |31 Dec 2022 17:40:35 +0000  |
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-01-06
            Summary|g++ is unable to capture    |dependent vector field is
                   |vector-extended variables   |not causing this to be
                   |                            |captured for fold
                   |                            |expression inside a if
                   |                            |constexpr block
               Host|#1 SMP PREEMPT_DYNAMIC Sat, |
                   |31 Dec 2022 17:40:35 +0000  |

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
template <typename T>
struct pint
{
  T __attribute__ ((vector_size (2 * sizeof(T)))) v_;

  void f(pint const& o)
  {
    [&]<int ...I>()
    {
      (
        [&]() noexcept
        {
          if constexpr(I)
          {
            v_[I];
          }
        }(),
        ...
      );
    }.template operator()<0, 1>();
  }

};

int main()
{
  using D =3D pint<int>;

  D a;
  D b;

  a.f(b);

  return 0;
}=