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

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



--- Comment #3 from Joseph Rushton Wakeling <joseph.wakeling at webdrake.net> 2013-07-05 07:38:56 PDT ---
(In reply to comment #2)
> 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;

This seems to stem from a descriptive passage at the top of p.4 of the paper,
where this choice of a, b, c values is described as one of the author's
favourites.  However, I suspect that this is a typo as it violates the a < c
rule described elsewhere in the paper and (as already stated) the 13, 17, 5
triple is not found in the table of appropriate triples for 32-bit Xorshift.

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