Bit subscriptions, RAM columnwise layouts

[BCS]

Reply to bearophile,

> So today the caches have changed a little how optimal code has to be
> written in C. The authors say that a downside of C is that it forces
> the programmer to do such memory layout manually, and today this may
> lead to less performance.
> 

Darn you, now I'm going to need to wright a column struct array template 
that takes a struct and stripes the columns.

OTOH this is going to be fun...