newCTFE: perliminary delegate support is in!

[Stefan Koch]

On Wednesday, 13 June 2018 at 06:10:26 UTC, Cym13 wrote:
>
> That's very nice! Out of curiosity, what was the reason to 
> avoid a conventional stack? Or was it a consequence more than a 
> design decision? (If you've explained it before, feel free to 
> just throw the old post at me)

It was an initial design decision. (I addressed it briefly in my 
2017 talk on newCTFE)
https://www.youtube.com/watch?v=crHnumzsLUs&t=2420

The main reason was to avoid the debugging nightmare that messing 
with the stack-pointer causes. I thought the most effective way 
to not have this problem was to simply eliminate the stack 
pointer.
Another reason is that I am noticing a tendency in real hardware 
to have multiple-stacked versions of the register set. Doing the 
same with my virtual cpu would be forward compatible :)

All in all I do not regret that decision at all.

It doubtlessly saved weeks of debugging!
(And harmonizes delegates with closures (since in newCTFE _all_ 
delegates have to be closures.))

Cheers,
Stefan