[PATCH] libstdc++: Add missing trait is_simd_flag_type

[Jonathan Wakely]

On Tue, 28 Mar 2023 at 11:41, Matthias Kretz via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>
> I don't know how, but I forgot to implement the
> is_simd_flag_type trait. This fixes it.
>
> No new check-simd failures on x86_64-pc-linux-gnu

OK

>
> --------------- 8< ------------------
>
> Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
>
> libstdc++-v3/ChangeLog:
>
>         * include/experimental/bits/simd.h (is_simd_flag_type): New.
>         (_IsSimdFlagType): New.
>         (copy_from, copy_to, load ctors): Constrain _Flags using
>         _IsSimdFlagType.
> ---
>  libstdc++-v3/include/experimental/bits/simd.h | 52 ++++++++++++++-----
>  1 file changed, 39 insertions(+), 13 deletions(-)
>
>
> --
> ──────────────────────────────────────────────────────────────────────────
>  Dr. Matthias Kretz                           https://mattkretz.github.io
>  GSI Helmholtz Centre for Heavy Ion Research               https://gsi.de
>  stdₓ::simd
> ──────────────────────────────────────────────────────────────────────────