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Newsgroups: comp.lang.ada
Date: Sun, 18 Feb 2018 14:50:35 -0800 (PST)
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Subject: Re: GNAT can't vectorize Real_Matrix multiplication from
 Ada.Numerics.Real_Arrays. What a surprise!
From: Bojan Bozovic <bozovic.bojan@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:50506
Date: 2018-02-18T14:50:35-08:00
List-Id: <comp.lang.ada>

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:
>=20
> 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.
>=20
> http://www.netlib.org/blas/
>=20
> Intel Math Kernel Library has all these.
>=20
> https://en.wikipedia.org/wiki/Math_Kernel_Library
>=20
> --Nasser

Well I wanted to compare how Ada would do against C simply in 4x4 matrix mu=
ltiplication, 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.Gene=
ric_Real_Arrays). Thanks for the links. I will have to bookmark them.