[Bug target/115556] error: this operation requires the SVE ISA extension

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115556

--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Plus (In reply to Andrew Pinski from comment #8)
> (In reply to Mathieu Malaterre from comment #7)
> > I can still reproduce the original issue with aarch64/gcc-15 and -O3.
> > 
> > Reproduced under godbold
> > 
> > https://gcc.godbolt.org/z/q3T94adWe
> 
> This could be a highway bug ...

No you are missing:
HWY_BEFORE_NAMESPACE();

in your example.