[Bug libstdc++/51795] linear_congruential_engine doesn't work correctly

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51795

--- Comment #11 from Marc Glisse <marc.glisse at normalesup dot org> 2012-01-27 13:12:05 UTC ---
(In reply to comment #10)
> Really, I don't think the intent here is involving arbitrary size integers.
> This stuff must be quick, and all the integers are unsigned. I don't think we
> have here something like the templates in time, really.

But if we round first modulo 2^64 then modulo m, it isn't the linear
congruential algorithm it is supposed to be. I think I'd prefer for the
compiler to reject the code when used with values that would make the generator
too slow.

Let me ask on the reflector, to be sure.