RFC: std.uuid

[Piotr Szturmaj]

Vladimir Panteleev wrote:
> On Monday, 26 December 2011 at 17:37:17 UTC, Piotr Szturmaj wrote:
>> Yes. Here are the results: http://pastebin.com/rD8kiaQy. This is
>> observed only with Windows DMD.
>
> I'd be more interested in seeing the code.

Sorry for late answer. For memcpy cases code is the same as in my github 
Phobos fork. Here is the change to slice copying: 
http://pastebin.com/EteqEper
>
> I've done some more research on this. In release builds, DMD on Windows
> emits a memcpy call for a slice copy. However, the auto-generated memcpy
> call has slightly less overhead (register/stack shuffling) than a manual
> memcpy call, which explains the performance difference I was seeing.