Does D optimize sqrt(2.0)?

[crimaniak via Digitalmars-d-learn]

On Thursday, 11 February 2016 at 07:41:55 UTC, Enjoys Math wrote:
> If I just type out sqrt(2.0) in D, is that automatically made 
> into a constant for me?
>
> Thanks.

for DMD -O :

import std.math;

immutable foo = sqrt(2.0);

pure float precalculated()
{
     return foo;
}

pure float not_precalculated()
{
     return sqrt(2.0);
}