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From: John Apa <japa@delphi.dasd.honeywell.com>
Subject: Re: CRC in Ada?
Date: 1997/03/07
Message-ID: <33205A31.3176@delphi.dasd.honeywell.com>#1/1
X-Deja-AN: 223957157
References: <1997Mar2.220652@nova.wright.edu>
 <331bf6ce.2832564@news.logica.co.uk>
Organization: Honeywell DASD
Newsgroups: comp.lang.ada
Date: 1997-03-07T00:00:00+00:00
List-Id: <comp.lang.ada>


Stephen Garriga wrote:
> 

snip 

>  _IF_ you are doing the CRC on a file (as I was), I would advise you
> to consider performance. I found (exactly the same algorithm)
> implemented in C took an order of magnitude seconds less to execute
> than the Ada equivalent.

Perhaps, but it so happens that I also implemented a crc algorithm in
both c and ada. I found that the ada was slightly faster (sun & i960,
using gnat for both) when running on disk files, and about even when
running against memory sections. Hmm. 

IMVHO: Any broad statement (C faster than Ada, or the converse) will be
found to have counter examples. Results may vary, as has been shown in
this group time and again. Choosing c or ada without looking at the
results from your particular implementations is simply bad engineering.
If you have a good compiler and knowledge of the language, you can write
very good/fast/safe/_understandable_ code. Ada95 has added many features
which will assist in this for a variety of situations and systems.

To those who don't think ada95 is the best thing out there right now,
read the Rationale for this ANSI/ISO/IEC standard. It should change your
mind. You could read the one for c++, but only if you're a physic. ;-)

John

> 
> Steve Garriga                         garriga@logica.com
>    type OPINION is access PERSONAL_THOUGHTS_AND_BIAS;
>    OPINION_STATED : new OPINION := not LOGICA.OPINION;
> Logica UK Ltd.   +44 171 637 9111   http://www.logica.com

-- 
***********************************
That's my opinion, not Honeywell's.
John Thomas Apa
Honeywell Defense Avionics Systems
Albuquerque, New Mexico.
***********************************