Do we have free bits in the info pointer itself?

[Edward Kmett]

Mostly just that GHC still works on 32 bit platforms.

-Edward

On Wed, Sep 7, 2016 at 5:32 PM, Ryan Newton <rrnewton at gmail.com> wrote:

> Our heap object header is one word -- an info table pointer
> <https://ghc.haskell.org/trac/ghc/wiki/Commentary/Rts/Storage/HeapObjects>
> .
>
> Well, a 64 bit info table pointer leaves *at least* 16 high bits inside
> the object header for other purposes, right?
>
> Is there any problem with using these other than having to mask the info
> table pointer each time it is dereferenced?
>
> Thanks,
>   -Ryan
>
>
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