Speed kills

[Basile B. via Digitalmars-d]

On Monday, 15 February 2016 at 23:19:44 UTC, Guillaume Piolat 
wrote:
>
> lround and friends have been a big performance problem at times.
> Everytime you can use cast(int) instead, it's way faster.

I didn't know this trick. It generates almost the same sse 
intruction (it truncates) and has the advantage to be inline-able.

Is it documented somewhere ? If not it should.