How to tune numerical D? (matrix multiplication is faster in g++ vs gdc)

[bearophile]

John Colvin:

> The performance of the multiplication loops and the performance 
> of the allocation are separate issues and should be measured as 
> such, especially if one wants to make meaningful optimisations.

If you want to improve the D compiler, druntime, etc, then I 
agree you have to separate the variables and test them one at a 
time. But if you are comparing languages+runtimes+libraries then 
it's better to not cheat, and test the whole running (warmed) 
time.


> http://dpaste.dzfl.pl/ is back online btw

dpaste is too much javascript-heavy for a very quick pasting. 
codepad is much more light if I don't want to run D code.

Bye,
bearophile