Re: [PATCH v2 2/3] docs/devel/style: add a section about bitfield, and disallow them for packed structures

[Richard Henderson]

On 11/27/24 19:01, Pierrick Bouvier wrote:
> On 11/27/24 09:46, Richard Henderson wrote:
> > On 11/26/24 18:15, Pierrick Bouvier wrote:
> > > Except for saving memory in *very* specific case (a structure allocated tens of 
> > > millions
> > > times for example), I hardly see a benefit vs using integer types.
> >
> > Even then, 'uint32_t flags' can be just as easy to use as unsigned foo:1, 
> > bar:1, etc:1.
> > Plus you get knowledge of the actual structure layout, which is presumably 
> > important
> > *because* it's allocated millions of times.
> >
> >
> > r~
>
> Do we have a specific API (or set of macros) in QEMU to help with this?
> If yes, maybe I could mention it in the doc ("we recommend using X instead of 
> bitfields").

Yes, include/hw/registerfields.h.


r~