Using -O with DMD seems to produce non-random values.

[ag0aep6g via Digitalmars-d-learn]

On Thursday, 19 May 2016 at 17:07:27 UTC, Michael wrote:
> On Thursday, 19 May 2016 at 15:49:17 UTC, ag0aep6g wrote:
[...]
>> [1] https://issues.dlang.org/show_bug.cgi?id=16027
>
> Yeah that's what I was thinking but I don't know much about the 
> optimisation process so I wanted to mention it anyway.

And now I see that you linked there yourself in the OP. No idea 
how I missed that.