Re: Large writable variables

On 17/10/2018 09:36, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
>> Attached is a patch that shrinks fmgr_builtins by 25%. That seems
>> worthwhile, it's pretty frequently accessed, making it more dense is
>> helpful.  Unless somebody protests soon, I'm going to apply that...
> Hah.  I'm pretty sure that struct *was* set up with an eye to padding ...
> on 32-bit machines.  This does make it shorter on 64-bit, but also
> makes the size not a power of 2, which might add a few cycles to
> array indexing calculations.  Might be worth checking whether that's
> going to be an issue anywhere.
>
> What's the point of the extra const decoration on funcName?  ISTM
> the whole struct should be const, or not.
>
>             regards, tom lane
>
Would it be useful to add dummy variable(s) to bring it up to a power of 2?


Cheers,
Gavin