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crc's Issues

Option 14: unholy alloy of gold and silver

With reference to https://www.corsix.org/content/fast-crc32c-4k, what I call crc32_4k is your option 12 ("8-byte Hardware-accelerated"), and what I call crc32_4k_three_way is your option 13 ("Golden"). The theoretical upper bound on option 13 is 64 bits/cycle, which your implementation gets close to, at 62 bits/cycle. What I realised is that:

  1. There's an inferior option, that I call crc32_4k_pclmulqdq, but you might call "Silver".
  2. Gold and silver use separate execution ports, and thus can be alloyed together, for a theoretical upper bound of 120.89 bits/cycle (this is 64+72 bytes every 9 cycles). I'm measuring 93 bits/cycle for this alloy, and I imagine that a well tuned implementation could get closer to 120.89.

Which crc32 implementation is this producing?

I find that the results of option_13_golden_intel don't match the crc32 values I'm expecting. The results match neither the crc32c library, nor zlib's crc32().

An example test string: hello-world tested between zlib, crc32c, and this package:

truth: 2983461467, zlib: 2983461467, crc32c: 4099351003, crc: 1585878819

A related discussion is at htot/crc32c#3. Do you know exactly which implementation of crc32 this library is producing?

No license provided

No license is currently provided for this project. Your work is quite nice, so it'd be cool to know what it can be used in.

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