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NNTP-Posting-Date: Sat, 21 Oct 2006 13:28:47 -0500
From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: GNAT compiler switches and optimization
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Date: Sat, 21 Oct 2006 13:28:47 -0500
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Date: 2006-10-21T13:28:47-05:00
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> I'd certainly be willing to run a few benchmarks but the important thing
> here is that rather innocent looking code is running 2-4x slower than it
>   "should".
But:
> > for Ada: "tst_array 800" runs in 18 seconds
> > for Fortran "tst_array 800" runs in 6 seconds
> >
> > (if I use the fortran "matmul" intrinsic the fortran time drops to
> > 2.5 seconds)
  Clearly the right way to do large matrix multiplies is to call matmul.
I'd be surprised if it made any significant difference whether it was
called from Ada or from Fortran.