[PATCH] libstdc++: Avoid vector casts while still avoiding PR90424

[Jonathan Wakely]

On Tue, 6 Jun 2023 at 13:34, Matthias Kretz via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:

> This is the first part of a fix for the failure of the new simd test on
> non-
> VSX POWER targets. There are more casts to unavailable vectors of 64-bit
> element types to be rewritten.
>
> OK for master and backports?
>

 OK for trunk and branches


> Tested on x86_64-pc-linux-gnu and powerpc64le-linux-gnu
>
> ------ >8 -------
>
> Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
>
> libstdc++-v3/ChangeLog:
>
>         PR libstdc++/109822
>         * include/experimental/bits/simd_builtin.h (_S_store): Rewrite
>         to avoid casts to other vector types. Implement store as
>         succession of power-of-2 sized memcpy to avoid PR90424.
> ---
>  .../include/experimental/bits/simd_builtin.h  | 40 +++++++------------
>  1 file changed, 15 insertions(+), 25 deletions(-)
>
>
> --
> ──────────────────────────────────────────────────────────────────────────
>  Dr. Matthias Kretz                           https://mattkretz.github.io
>  GSI Helmholtz Centre for Heavy Ion Research               https://gsi.de
>  stdₓ::simd
> ──────────────────────────────────────────────────────────────────────────