From: Joel Seidman <joel.seidman-nospam@trw.com>
Subject: Re: should I be interested in ada?
Date: 1999/02/18
Date: 1999-02-18T00:00:00+00:00 [thread overview]
Message-ID: <36CC7576.F3D5DA5C@trw.com> (raw)
In-Reply-To: 7ahkn0$kab$1@plug.news.pipex.net
Nick Roberts wrote:
>
> Jerry Petrey wrote in message <36CC11A1.C7A71642@hercii.mar.lmco.com>...
> [...]
> |> Fortran's array facilities as an example, in Fortran one can put:
> |>
> |> real, dimension (1:10) :: x
> |> ...
> |> x = 1.0
> |>
> |> setting all the elements of x to 1.0 (a 'broadcast scalar'), whereas in
> Ada
> |> to do the same thing, you must code something like:
> |>
> |> X: array (1..10) of Float;
> |> ...
> |> for i in X'Range loop X(i) := 1.0; end loop;
> |
> |
> |I think using an aggregate would be much better than a loop:
> |
> |X := (1 .. 10 => 1.0);
>
> Precisely right, of course.
>
Hmmmm. This raises a question about what "better" means. I have seen the
latter recommended for style, and it does read better to me. However,
when I applied this to large aggregates, stack utilization went throught
the roof. The compiler (VADS) created a temp and then moved it on top of
the target variable. I quickly learned to use this method only where the
aggregate couldn't be too large. I'm really not sure why VADS does this.
Is it typical of Ada compilers? Or was VADS failing to do a fairly
obvious optimization. (To be fair, this was an old version of VADS. I
haven't tried this with our current compiler.)
-- Joel
next prev parent reply other threads:[~1999-02-18 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 ` William Clodius
1999-02-18 0:00 ` dennison
1999-02-18 0:00 ` robert_dewar
1999-02-18 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
1999-02-18 0:00 ` Joel Seidman [this message]
1999-02-18 0:00 ` William Clodius
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 ` nabbasi
1999-02-18 0:00 ` robert_dewar
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 ` dennison
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
1999-02-20 0:00 ` should I be interested in ada? robert_dewar
1999-02-20 0:00 ` Steve Doiel
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 ` William Clodius
1999-02-19 0:00 ` robert_dewar
1999-02-19 0:00 ` Phillip Helbig
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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