[Issue 10550] Xorshift32 and Xorshift160 do not generate uniformly-distributed random numbers

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10550



--- Comment #2 from Joseph Rushton Wakeling <joseph.wakeling at webdrake.net> 2013-07-05 07:35:38 PDT ---
I also think the choice of a, b, c values may be in error: currently we have

    alias XorshiftEngine!(uint, 32,  13, 17, 5)  Xorshift32;

... but I think this is most likely a typo for

    alias XorshiftEngine!(uint, 32,  13, 17, 15)  Xorshift32;

as the paper states that there should be a < c and the triple 13, 17, 5 is not
found among the list of valid triples (while 13, 17, 15 is).

However, correcting this does not prevent the unittest fail described in the
previous comment.

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