Discussion: Porting 58000 lines of D and C++ to jai, Part 0: Why and How

[TheGag96]

On Wednesday, 23 November 2022 at 19:42:22 UTC, Johan wrote:
> About the compilation speed, I think the author does not yet 
> realize that you have to think about performance of 
> compile-time execution, similarly as with runtime execution. 
> The algorithm used matters a lot, also at compile time. 
> Spending 60sec on that small of a codebase is not my experience 
> (*), so I think it's just a piece of compile-time code that is 
> consuming most of the time (note that his optimized build only 
> takes 2x longer).

I'm very interested in seeing how using Jai turns out for this 
guy, but I was wondering about this too... Just what kind of code 
has he been writing to cause D to take a whole minute to 
compile?? Is he compiling each D file separately? I can 
understand the rest of his criticisms but I think this problem 
may be solely his own, even if our CTFE engine and template 
instantiation isn't the fastest.