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

[bearophile]

On Monday, 4 March 2013 at 04:12:18 UTC, bearophile wrote:
> Your benchmark code updated to D2:
>
> http://codepad.org/WMgu6XQG

Sorry, this line:

enum size_t SIZE = 200;

Should be:

enum size_t SIZE = 2_000;

Bye,
bearophile