Re: CRC slicing-by-8

[Antonio Diaz Diaz]

Hello Adam,

Sorry for the late answer. I have been busy.

Adam Tuja wrote:
> Reading discussion about polynomial selection
> (https://lists.gnu.org/archive/html/lzip-bug/2017-05/msg00003.html) I wondered
> whether better/faster CRC would make a difference in de/compression speed.

Thanks for the suggestion, but I have already tried faster ways of 
calculating the CRC and I do not think that the (small) increase in speed is 
worth the increase of portability problems it causes. In line 175 of lzip.h 
you can find a comment describing my current opinion on the matter:

  // about as fast as it is possible without messing with endianness

> I also tested lzlib with lzbench (https://github.com/inikep/lzbench) but
> difference was much smaller. I wonder whether I did something wrong.

Probably not. I have also tried, and most changes that make lzip faster 
don't work as well (or at all) in lzlib.

Best regards,
Antonio.