From: "Nick Roberts" <Nick.Roberts@dial.pipex.com>
Subject: Re: should I be interested in ada?
Date: 1999/02/22
Date: 1999-02-22T00:00:00+00:00 [thread overview]
Message-ID: <7aslfr$gpq$2@plug.news.pipex.net> (raw)
In-Reply-To: 7anl92$om3$1@nnrp1.dejanews.com
robert_dewar@my-dejanews.com wrote in message
<7anl92$om3$1@nnrp1.dejanews.com>...
|Well as I said before, more and more, I suspect you have
|not written many large Fortran codes.
Correct, I have written very little Fortran code (for real). What I have
done is to translate an awful lot of Fortran into Ada. The catch is, though,
that this was Fortran 77 (and Ada 83), and quite a few years ago. I do know
Fortran 90, but mostly from an academic point of view (I study languages),
and I appreciate that it is quite a different beast in many ways.
I have studied a lot of languages, both specifically and in general, for
many years now, as well as the various issues relating to computer languages
(especially compilation). I think this has given a fair 'nose' for the
issues, but, as Plato said, "that man is wisest who, like Socrates, realizes
that his wisdom is worthless."
I am also an opera fan (but I don't actually sing ;-).
|Certainly in the
|Fortran systems I have worked on, this is not "moderately
|unusual" it is absolutely typical. Furthermore, this is
|not a consequence of the language, but rather it is typical
|of numerical codes.
I think, possibly, Robert misunderstands, or maybe I didn't put it clearly.
What I mean is that if you were to take a typical program - Fortran or Ada -
and count up (a) the number of subprogram definitions, and then (b) the
number of subprogram definitions which could have aliased parameters, and
then divided (b) by (a), you would almost always get a fairly small ratio
(mostly between 10% and 20% I would guess).
Does anyone have any figures on this sort of thing?
[...]
|> It is quite possible for the compiler to generate two
|> object code versions for such a subprogram (one for
|> parameters definitely non-aliased, one for
|> otherwise), and call the appropriate one at different
|> call sites.
|
|Maybe possible ... practical, no!
Would it really be impractical? I would appreciate anyone expanding on this
point (it is important to me!)?
[...]
I agree with the rest of Robert's post (the substantial part).
[BTW I would like to restate that I am very pleased - most gratified
really - to see answers to my silly posts from the likes of Professor
Dewar, a man who has a rare depth of experience in the field (of computer
science and the development of programming languages). My personal
philosophy is that the only way to learn is to make mistakes. To have your
mistakes pointed out to you by the experts is a privilege. I say what I
really think (you may have noticed ;-), and I do not give praise lightly.]
-------------------------------------
Nick Roberts
-------------------------------------
next prev parent reply other threads:[~1999-02-22 0:00 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-02-14 0:00 should I be interested in ada? Phillip Helbig
1999-02-15 0:00 ` Gautier
1999-02-15 0:00 ` Marin David Condic
1999-02-23 0:00 ` David Starner
1999-02-16 0:00 ` Ken Thomas
1999-02-17 0:00 ` Nick Roberts
1999-02-18 0:00 ` robert_dewar
1999-02-18 0:00 ` Nick Roberts
1999-02-18 0:00 ` robert_dewar
1999-02-19 0:00 ` Nick Roberts
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` William Clodius
1999-02-19 0:00 ` Nick Roberts
1999-02-20 0:00 ` robert_dewar
1999-02-22 0:00 ` Nick Roberts
1999-02-23 0:00 ` Robert I. Eachus
1999-02-24 0:00 ` White rabbit (was: should I be interested in ada?) dennison
1999-02-25 0:00 ` Alice books " JP Thornley
1999-02-25 0:00 ` Robert I. Eachus
1999-02-22 0:00 ` should I be interested in ada? dennison
1999-02-20 0:00 ` robert_dewar
1999-02-20 0:00 ` Steve Doiel
1999-02-19 0:00 ` Phillip Helbig
1999-02-19 0:00 ` dennison
1999-02-19 0:00 ` Nick Roberts
1999-02-20 0:00 ` robert_dewar
1999-02-22 0:00 ` Nick Roberts
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` William Clodius
1999-02-18 0:00 ` William Clodius
1999-02-18 0:00 ` nabbasi
1999-02-18 0:00 ` robert_dewar
1999-02-18 0:00 ` robert_dewar
1999-02-19 0:00 ` William Clodius
1999-02-19 0:00 ` Nick Roberts
1999-02-20 0:00 ` robert_dewar
1999-02-22 0:00 ` Nick Roberts
1999-02-22 0:00 ` William Clodius
1999-02-23 0:00 ` robert_dewar
1999-02-23 0:00 ` Nick Roberts
1999-02-22 0:00 ` William Clodius
1999-02-23 0:00 ` Nick Roberts
1999-02-23 0:00 ` William Clodius
1999-02-25 0:00 ` Nick Roberts
1999-02-25 0:00 ` robert_dewar
1999-02-23 0:00 ` Robert I. Eachus
1999-02-24 0:00 ` Nick Roberts
1999-02-26 0:00 ` Robert A Duff
1999-02-27 0:00 ` Semantic info pragmas (was: should I be interested in ada?) Nick Roberts
1999-03-01 0:00 ` Samuel Tardieu
1999-03-01 0:00 ` Robert A Duff
1999-02-24 0:00 ` should I be interested in ada? William Clodius
1999-02-24 0:00 ` William Clodius
1999-02-25 0:00 ` Nick Roberts
1999-02-25 0:00 ` robert_dewar
1999-02-26 0:00 ` Nick Roberts
1999-02-18 0:00 ` Jerry Petrey
1999-02-18 0:00 ` fraser
1999-02-19 0:00 ` Matthew Heaney
1999-02-20 0:00 ` fraser
1999-02-18 0:00 ` Nick Roberts
1999-02-18 0:00 ` Dan Nagle
1999-02-18 0:00 ` nabbasi
1999-02-19 0:00 ` Nick Roberts
1999-02-19 0:00 ` Dan Nagle
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` Dan Nagle
1999-02-19 0:00 ` Nick Roberts
1999-02-23 0:00 ` Peter Hermann
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` Nick Roberts
1999-02-19 0:00 ` robert_dewar
1999-02-21 0:00 ` William Clodius
1999-02-23 0:00 ` Robert I. Eachus
1999-02-19 0:00 ` William Clodius
1999-02-20 0:00 ` Nick Roberts
1999-02-21 0:00 ` robert_dewar
1999-02-21 0:00 ` William Clodius
1999-02-22 0:00 ` Nick Roberts [this message]
1999-02-18 0:00 ` Joel Seidman
1999-02-18 0:00 ` robert_dewar
1999-02-18 0:00 ` Nick Roberts
1999-02-18 0:00 ` William Clodius
1999-02-18 0:00 ` dennison
1999-02-20 0:00 ` Hartmut H. Schaefer
1999-02-20 0:00 ` bill
1999-02-21 0:00 ` dewar
1999-02-21 0:00 ` dewar
1999-02-22 0:00 ` dennison
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