overlapping copy semantics question

[Bruce Carneal]

On Monday, 20 May 2024 at 23:09:35 UTC, Bruce Carneal wrote:
> On Monday, 20 May 2024 at 18:14:50 UTC, kinke wrote:
>> ...
>
> What am I missing?

What I "missed" was the overlap check and branch around on entry 
to the vanilla code block that protects the SIMD version.

Sorry for the noise.  Glad to learn about the, slight, 
optimization though.