[PATCH v4 1/2] libstdc++: Refactor _ScalarAbi<N> into _Abi<N, N>

[Matthias Kretz]

Jonathan Wakely [Wednesday, 1 July 2026, 12:42:41 CEST]:
> The patch is OK for trunk with the missing 'p' fixed, and preferably
> just switching to markdown.

Backport to 16?

With std::simd in GCC 16 being fairly experimental, I would like to backport 
this patch.
1. This restores ABI compatibility between GCC 16.2 and up (so that we only 
break between 16.1 and everything else).
2. Without it, backporting upcoming patches becomes harder.

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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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