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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99396] std::rotl and std::rotr Does not
 convert into ROTATE on the gimple level
Date: Fri, 05 Mar 2021 09:50:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99396

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
so
      using __unsigned_type =3D __make_unsigned<_Tp>::__type;
      constexpr auto _Nd =3D __gnu_cxx::__int_traits<__unsigned_type>::__di=
gits;
      const auto __r =3D static_cast<unsigned int>(__s);
      const auto __y =3D static_cast<__unsigned_type>(__x;
      const auto __z =3D (__y << (__r % _Nd)) | (__y >> ((-__r) % _Nd));
      return static_cast<_Tp>(__z);
?  Of course, if _Tp can be anything other than integral types, it would ne=
ed
to be a specialization for integral types (though it will work for __int128
fine if that doesn't count as integral).=