Testing some singleton implementations

[Andrej Mitrovic]

On 1/31/14, Stanislav Blinov <stanislav.blinov at gmail.com> wrote:
> You forgot to make the flag static for AtomicSingleton.

Ah. It was copied verbatim from reddit, I guess we both missed it.

> Timings on my machine:
>
> ldc2 -unittest -release -O3:
>
> Test time for LockSingleton: 537 msecs.
> Test time for SyncSingleton: 2 msecs.
> Test time for AtomicSingleton: 2.25 msecs.

Here's mine:

$ dmd -release -inline -O -noboundscheck -unittest -run singleton.d

Test time for LockSingleton: 577.5 msecs.
Test time for SyncSingleton: 9.25 msecs.
Test time for AtomicSingleton: 159.75 msecs.

Maybe ldc's optimizer is just much better at this? In either case how
come the atomic version is slower?