This sounds familiar. If you search back in the archives around 2004 or so I think you'll find a similar discussion when we replaced the crc32 implementation with what we have now. We put a fair amount of effort into searching for faster implementations so if you've found one 3x faster I'm pretty startled. Are you sure it's faster on all architectures and not a win sometimes and a loss other times? And are you sure it's faster in our use case where we're crcing small sequences of data often and not crcing a large block?
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