[PATCH] libstdc++: fix _MaskImplNeon::_S_popcount NEON temporaries on 32-bit Arm [PR122981]

[Matthias Kretz]

Jonathan Wakely [Friday, 24 July 2026, 18:37:54 CEST]:
> N.B. <experimental/simd> has been superseded by <simd> and it would be
> better to spend time adding arm support to <simd> instead of polishing
> the old code.

I would very much welcome help in getting <simd> ready for ARM. If you're 
interested get in touch!

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 Dr. Matthias Kretz                           https://mattkretz.github.io
 GSI Helmholtz Center for Heavy Ion Research               https://gsi.de
 std::simd
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