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From: Preben Randhol <randhol+abuse@pvv.org>
Newsgroups: comp.lang.ada
Subject: Re: What is faster Ada or C?
Date: Fri, 7 Dec 2001 18:32:03 +0000 (UTC)
Organization: Norwegian university of science and technology
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On 07 Dec 2001 19:26:00 +0200, Aaro Koskinen wrote:
> Jacob Sparre Andersen <sparre@nbi.dk> writes:
>> Certainly. (On ix86 processors) GNU C++ inlines the sqrt
>> operation built into the processor, while GNU Ada makes
>> calls to a Sqrt function.
> 
> I thought GNAT could do this as well, there's the following comment in
> Numerics.Aux:
> --  This package provides the basic computational interface for the generic
> --  elementary functions. The C library version interfaces with the routines
> --  in the C mathematical library, and is thus quite portable, although it may
> --  not necessarily meet the requirements for accuracy in the numerics annex.
> --  One advantage of using this package is that it will interface directly to
> --  hardware instructions, such as the those provided on the Intel 80x87.
> [...]
>    function Sqrt (X : Double) return Double;
>    pragma Import (C, Sqrt, "sqrt");

Using Ada.Numerics.Aux result in the same execution time roughly. But
now if I remove the Put_Line statement and use -O3 the whole loop is
removed by the optimiser :-)

Preben
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