Assembly - 64-bit registers supported?

[nazriel]

On Saturday, 19 January 2013 at 12:45:06 UTC, deed wrote:
> void main()
> {
>     asm
>     {
>         mov    RAX, 3;
>     }
> }
>
> results in:
> Error: undefined identifier 'RAX'
>
> AX and EAX work.
>
> Anything missing or isn't it yet implemented?

http://dpaste.dzfl.pl/0f79b5ba

Missing -m64 or something?