On 2021-08-13 14:40:08 +0300, Yura Sokolov wrote:
> Ranier Vilela писал 2021-08-13 14:12:
> > Em sex., 13 de ago. de 2021 às 07:15, Andres Freund
> > <andres@anarazel.de> escreveu:
> > > Personally I find it more obvious to understand the intended
> > > behaviour
> > > with ~0 (i.e. all bits set) than with a width truncation.
> >
> > https://godbolt.org/z/57WcjKqMj
> > The generated code is identical.
>
> I believe, you mean https://godbolt.org/z/qWzE1ePTE
I don't think the choice of instructions matters. This is called around
creation and resizing - the other costs are several orders of magnitude
more expensive than determining the mask.
