Re: [PATCH] Add slice by 8 algorithm to cksum to make it faster.

[Pádraig Brady]

On 26/12/2020 13:53, Kristoffer Brånemyr via GNU coreutils General Discussion 
wrote:
> Hi,
>
> I modified cksum to use the well known slice by 8 algorithm in the CRC 
> calculation, to make it faster. On my machine it is several times faster than 
> the unmodified cksum. It took me a while to figure out since the CRC 
> calculation in cksum shifts in the opposite direction than most other 
> implementations I've seen. I would be glad if someone could check this patch on 
> a big endian machine to see if it produces the correct output! It think it 
> might, but not sure.
>
> You can see the patch here:
> https://github.com/coreutils/coreutils/pull/43

Thanks for the patch!
I wouldn't focus on big endian perf,
but I will test on a SPARC-Enterprise-T5220 system I have access to.

I would explicitly depend on byteswap in bootstrap.conf now,
rather than relying on the transitive dependency through md5sum etc.

cheers,
Pádraig