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Some improvements to CRC.

Rika requested to merge runewalsh/source:crc into main

  • Replace the strange runtime assembling of the 32-bit polynomial with its final representation.

  • Reduce unrolls to 4× (8× must be too extreme everywhere... on my computer the best value is 1×), and use constant offsets from buf[0] to buf[number of unrolls - 1].

  • Speed up CRC-128 by 7 (x64) ~ 15 (i386) times by manually inlining everything.

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