Dude about ~ array concatenation performance

[H. S. Teoh]

On Tue, Dec 01, 2020 at 10:49:55PM +0000, ddcovery via Digitalmars-d-learn wrote:
> Yesterday I really shocked when, comparing one algorithm written in
> javascript and the equivalent in D, javascript performed better!!!
[...]
> With 1 million Double numbers (generated randomly):
>   Javascript (node 12): 1507 ms
>   DMD: 2166 ms
> 
> With 6 million Double numbers
>   Javascript (node 12): 10776 ms
>   DMD: 15243 ms

Yeah, when it comes to performance-related things, don't bother with
DMD.  Its optimizer is known to have limitations, and IME consistently
produces code that underperforms LDC-generated code by about 20-30%,
sometimes even as high as 40%.

For performance comparisons, always use GDC/LDC.


T

-- 
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