No CTFE of function

[Cecil Ward via Digitalmars-d-learn]

On Saturday, 26 August 2017 at 23:53:36 UTC, Cecil Ward wrote:
> On Saturday, 26 August 2017 at 23:49:30 UTC, Cecil Ward wrote:
>> [...]
>
> I was expecting this optimisation to 'return literal constant 
> only' because I have seen it before in other cases with GDC. 
> Obviously generating a call that involves running the algorithm 
> at runtime is a performance disaster when it certainly could 
> have all been thrown away in the particular case in point and 
> been replaced by a return of a precomputed value with zero 
> runtime cost. So this is actually an issue with specific 
> compilers, but I was wondering if I have missed anything about 
> any D general rules that make CTFE evaluation practically 
> impossible?

I suspect I posted this in the wrong category completely, should 
have been under GDC (poss applies to LDC too, will test that)