noinline, forceinline, builtin_expect

[Walter Bright via Digitalmars-d]

On 1/2/2015 6:34 AM, Martin Nowak wrote:
> The compiler can't make good decisions here, because it lacks information about
> which branches are executed rarely.

The dmd optimizer assumes that for:

    if (e)
       e1;
    else
       e2;

that e1 is executed more often than e2. Of more interest, though, is not 
inlining very rarely executed code, because it will cause suboptimal register 
allocation.