CTFE Status

[Stefan Koch via Digitalmars-d]

On Tuesday, 24 January 2017 at 15:16:29 UTC, Nordlöw wrote:
> On Tuesday, 24 January 2017 at 14:16:10 UTC, Stefan Koch wrote:
>> There will be NO permanence improvement for pegged.
>> For the 7th time.
>>
>> It is bogged down by templates, ctfe is not the problem there.
>
> Sorry for that. Got it.
>
> What's the essence of this suboptimal performance when using 
> templates?
>
> Non-O(1) lookup times?
>
> Mangling?

The lookup time is one issue but not the most important,
The instanciation of a template is a non-trivial operation within 
the compiler.
Type-deduction ast rewriting expression expansion
all of that takes time and a huge chunk at that.
Also binary code needs to be generated and that code is generated 
for every instance regardless of how similar they are.