Re: [eigen] Comma-initializer is quite expensive with compile-time known constants

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GCC sometimes has trouble to fully optimize code inside the main
function -- simply renaming your function will give fully optimized code
(I'm not sure whether that is a known issue or a "feature" of GCC).
Also, once you sufficiently tested your code, you should compile with
`-DNDEBUG` to disable assertions.


Thanks a lot, Christoph! Yeah that makes a big difference - I'll be sure to keep that in mind when playing with the compiler explorer, guess I was too quick in my assumptions this time.. 

Best regards,

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