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Re: Re: CRC slicing-by-8

From: p . z . l
Subject: Re: Re: CRC slicing-by-8
Date: Sat, 12 Mar 2022 22:33:11 +0100
User-agent: GWP-Draft

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.

I understand.

Have you got any idea why this:
    c = crc32[(c ^ buffer[i]) & 0xFF] ^ ( c >> 8 ); /// lzip
is faster than this:
    c = (c >> 8) ^ crc32[(c & 0xFF) ^ buffer[i]]; /// sbrumme crc

I noticed the difference in lzip (mentioned mod) and tested it here: (https://pastebin.com/tkcMbTHR). Although in this setup difference is smaller in lzip is more noticeable.

PS. What do you think about Time/Speed of de/compression summary (https://lists.nongnu.org/archive/html/lzip-bug/2022-02/msg00001.html)?

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