Re: GNAT can't vectorize Real_Matrix multiplication from Ada.Numerics.Real_Arrays. What a surprise!

[Bojan Bozovic <bozovic.bojan@gmail.com>]

On Sunday, February 18, 2018 at 10:48:42 PM UTC+1, Nasser M. Abbasi wrote:
> On 2/18/2018 1:38 PM, Bojan Bozovic wrote:
> 
> If you are doing A*B by hand, then you are doing something
> wrong. Almost all languages end up calling Blas
> Fortran libraries for these operations. Your code and
> the Ada code can't be faster.
> 
> http://www.netlib.org/blas/
> 
> Intel Math Kernel Library has all these.
> 
> https://en.wikipedia.org/wiki/Math_Kernel_Library
> 
> --Nasser

Well I wanted to compare how Ada would do against C simply in 4x4 matrix multiplication, and I was surprised to see several times slower results, so I tried then to code 'by hand' to attempt to achieve the same speed with Ada (and the speed is comparable). I'm just learning the language and so I was unaware of it's finesses (such as making new instance of Ada.Numerics.Generic_Real_Arrays). Thanks for the links. I will have to bookmark them.