[4Walter&Andrei] D is 40 times slower. We need a new language feature!

[9il via Digitalmars-d]

On Saturday, 20 May 2017 at 11:30:54 UTC, John Colvin wrote:
> On Saturday, 20 May 2017 at 03:24:41 UTC, 9il wrote:
>> Hello,
>>
>> When users write math code, they expect [2, 3, 4] that the 
>> code like
>>
>> [...]
>
> What you are saying is that there is a specific shortcoming 
> that you are observing in optimisers, yes? Perhaps we should 
> investigate how to fix the optimisers first before insisting on 
> language additions / changes.
>
> Have you talked to someone with experience writing optimisers 
> about what stops the relevant optimisation being done after 
> inlining?

I just found that new LLVM solves this issue (and was very 
surprised).
The reason that ndslice <=v0.6.1 was so slow is LDC Issue 2121.
I have added workaround in [2], it is v0.6.2.

[1] https://github.com/ldc-developers/ldc/issues/2121
[2] https://github.com/libmir/mir-algorithm/pull/41