Fixing core.atomic

Wed Jun 2 15:30:46 UTC 2021

On Wednesday, 2 June 2021 at 15:19:59 UTC, Ola Fosheim Grøstad 
wrote:
> On Wednesday, 2 June 2021 at 15:09:54 UTC, rm wrote:
>> inc/dec are implemented in terms of fetch_add.
>
> IIRC some architectures provide more efficient inc/dec atomics 
> without fetch? I haven't looked at that in years, so I have no 
> idea what the contemporary situation is.

No, I think that was wrong, I think they usually return the 
original value (or set a flag or whatever). But it doesn't 
matter. We should just look at what the common contemporary 
processors provide and look at instructions per clock cycles 
throughput. I guess last generation ARM/Intel/AMD is sufficient?