Re: [eigen] Intermediate Packet Storage

[Joel Holdsworth <joel@xxxxxxxxxxxxxxxxxxx>]

> Yes, I have no idea about what causes this -- maybe some ARM expert can 
> chip in.

I posted a bug to gcc bugzilla:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93005

This godbolt link shows the difference very clearly:

https://godbolt.org/z/_hEykm

When code is written using intrinsics, gcc is able to promote a stack 
array to SIMD registers on SSE, but not on NEON.

Joel