clmul with -1 performs a prefix xor. Does anyone know a fancy use-case for that maybe?
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Can you name applications for CLMUL that are not CRC, GCM, hashing/rng, or Erasure Code? I'm trying to create a list of possible applications. #RISCV #Bitmanip #Followerpower cc @rygorous @geofflangdale @alt_kia @lemire @rrika9
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I was once asked to factorize the result of a clmul back into it's components for a job interview.
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I didn't understand the math behind it back then, so I just threw it at a SAT solver which worked until I went past 16 bits lol
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CLMUL a number with itself inserts zeroes between each input bit. Useful if you want to construct morton-codes. They are useful to index into large 2D arrays because they are very cache friendly.
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Thanks! I've now added that as clmul(h) use-case (and "zip" use-case, which is the more obvious choice for morton-codes within xbitmanip) to the current draft document at https://raw.githubusercontent.com/cliffordwolf/xbitmanip/master/xbitmanip-draft.pdf …, and added you as contributor, and added the following invariant to my tests.pic.twitter.com/32dWnYWLTh
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