Floating Point + Threads?

[Andrei Alexandrescu]

On 4/16/11 9:59 AM, dsimcha wrote:
> On 4/16/2011 10:55 AM, Andrei Alexandrescu wrote:
>> On 4/16/11 9:52 AM, dsimcha wrote:
>>> Output:
>>> Rounding mode: 0
>>> 0.7853986633972191094
>>> Rounding mode: 0
>>> 0.7853986633972437348
>>
>> I think at this precision the difference may be in random bits. Probably
>> you don't need to worry about it.
>>
>> Andrei
>
> "random bits"? I am fully aware that these low order bits are numerical
> fuzz and are meaningless from a practical perspective. I am only
> concerned because I thought these bits are supposed to be deterministic
> even if they're meaningless. Now that I've ruled out a bug in
> std.parallelism, I'm wondering if it's a bug in druntime or DMD.

I seem to remember that essentially some of the last bits printed in 
such a result are essentially arbitrary. I forgot what could cause this.

Andrei