Naive node.js faster than naive LDC2?

[H. S. Teoh]

On Fri, Aug 21, 2020 at 11:22:27PM +0000, James Lu via Digitalmars-d wrote:
[...]
> Bonus: Direct translation of Dlang to Node.js, Node.js faster
> https://gist.github.com/CrazyPython/8bafd16837ec8ad4c5a638b9d305fc96
> 
> Dlang: 4076 3622 2934 (3544 average)
> Node.js: 2624 2334 2316 (2424 average)
> 
> LDC2 is 46% slower!

Using a class for Complex (and a non-final one at that!!) introduces
tons of allocation overhead per iteration, plus virtual function call
overhead.  You should be using a struct instead.  I betcha this one
change will make a big difference in performance.

Also, what's the command you're using to compile the program?  If you're
doing performance comparison, you should specify -O2 or -O3.


T

-- 
Knowledge is that area of ignorance that we arrange and classify. -- Ambrose Bierce