Thanks again!

I just found this:
http://stackoverflow.com/questions/2550281/floating-point-vs-integer-calculations-on-modern-hardware

According to the information presented there, generic multiplication is 
slower for ints than for floats. 

Em quarta-feira, 21 de setembro de 2016 20:14:34 UTC-3, Steven G. Johnson 
escreveu:
>
> Floating-point matrix multiplication uses a highly optimized BLAS library 
> (OpenBLAS), while integer matrix multiplication uses generic code.
>

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