I can't make Bugzilla account and there is possible GCC Ada (GNAT) bug in optimizing the code - ada.numerics.real_arrays Real_Matrix multiplication slower than doing things 'by hand'. I attached code.

[Bojan Bozovic]

My email got rejected when I tried to get bugzilla account manually.
Anyway this is confirmed not a bug just instantiating with : package
R_A is new Ada.Numerics.Generic_Real_Arrays (Float); use R_A; makes
code run comparable to coding multiplication by hand (and GCC C code).
It's just run time library isn't compiled with aggressive
optimizations (-O3 -march=skylake for x86_64 or -O3 -mavx2 for i686).

On Mon, Feb 19, 2018 at 4:47 PM, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> If you want a bugzilla account then you should send an email to the
> address that Bugzilla tells you to contact.