[PATCH 3/8] libstdc++: More efficient masked inc-/decrement implementation

[Jonathan Wakely]

On Thu, 23 Feb 2023 at 08:55, Matthias Kretz via Libstdc++
<libstdc++@gcc.gnu.org> wrote:
>


OK for trunk (and maybe backport later if you want to).


>
> Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
>
> libstdc++-v3/ChangeLog:
>
>         PR libstdc++/108856
>         * include/experimental/bits/simd_builtin.h
>         (_SimdImplBuiltin::_S_masked_unary): More efficient
>         implementation of masked inc-/decrement for integers and floats
>         without AVX2.
>         * include/experimental/bits/simd_x86.h
>         (_SimdImplX86::_S_masked_unary): New. Use AVX512 masked subtract
>         builtins for masked inc-/decrement.
> ---
>  .../include/experimental/bits/simd_builtin.h  | 27 +++++++-
>  .../include/experimental/bits/simd_x86.h      | 68 +++++++++++++++++++
>  2 files changed, 93 insertions(+), 2 deletions(-)
>
>
> --
> ──────────────────────────────────────────────────────────────────────────
>  Dr. Matthias Kretz                           https://mattkretz.github.io
>  GSI Helmholtz Centre for Heavy Ion Research               https://gsi.de
>  stdₓ::simd
> ──────────────────────────────────────────────────────────────────────────