Message326908
>> I've noted before, e.g., that sticking to a prime
>> eliminates a world of regular bit patterns in the
>> multiplier.
> Why do you think this? 0x1fffffffffffffff is prime :-)
Point taken ;-) But "a world of" is not the same as "the universe". For example, sticking to a prime you'll never get 8 bytes the same. Etc - "a world of" extremely regular patterns are eliminated.
> Having regular bit patterns and being prime are independent
> properties.
>
> To be clear: I don't have anything against picking a prime
> but we just shouldn't pretend that primes are important
> when they are not. That's all...
I don't like arguments from ignorance. As I've said, I don't know why SeaHash uses a prime. Neither do you. Our collective ignorance doesn't imply the designer didn't have a good reason.
I can't think of a "good reason" for it either, but that's where we differ: I think "so don't make gratuitous changes" while you think "therefore it can't possibly matter" ;-) |
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Date |
User |
Action |
Args |
2018-10-02 21:12:25 | tim.peters | set | recipients:
+ tim.peters, rhettinger, mark.dickinson, eric.smith, jdemeyer, sir-sigurd |
2018-10-02 21:12:25 | tim.peters | set | messageid: <1538514745.12.0.545547206417.issue34751@psf.upfronthosting.co.za> |
2018-10-02 21:12:25 | tim.peters | link | issue34751 messages |
2018-10-02 21:12:25 | tim.peters | create | |
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