From: "Martin Dowie" <martin.dowie@gecm.com>
Subject: constants v variables (was Re: if statements)
Date: 2000/11/09
Date: 2000-11-09T00:00:00+00:00 [thread overview]
Message-ID: <3a0a6f6c$1@pull.gecm.com> (raw)
In-Reply-To: 8udce8$1qi$1@nnrp1.deja.com
Robert Dewar <robert_dewar@my-deja.com> wrote in message
news:8udce8$1qi$1@nnrp1.deja.com...
[snip]
> Fifth, Temp is a variable, when it should be a constant. People
> very much overuse variables.
Thanks for highlighting this one - I've been bleeting on about this locally
(and even in c.l.a. once!) for ages to collegues. I've noticed that apart
from the analysis-of-the-problem meaning (i.e. it shows that the value has
been determined to be the same thoughout its scope) there are also
efficiency benefits, at least on one of our target compilers (in
non-optimising mode, untried when optimising).
My question is - can these efficiencies be expected from a compiler, by the
way the ARM defines variables v constants, or is this just because of the
particular compiler we were using. Will any 'decent' compiler spot when a
'variable' should actually have been declared as a constant?
next prev parent reply other threads:[~2000-11-09 0:00 UTC|newest]
Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-03 14:42 if statements sc297
2000-11-03 0:00 ` David Starner
2000-11-07 0:00 ` John English
2000-11-13 0:00 ` Dale Pontius
2000-11-03 16:09 ` Larry Kilgallen
2000-11-03 0:00 ` tmoran
2000-11-03 0:00 ` Larry Kilgallen
2000-11-06 0:00 ` Brian Orpin
2000-11-03 0:00 ` David Starner
2000-11-05 0:00 ` tmoran
2000-11-06 0:00 ` David Starner
2000-11-08 0:14 ` Alejandro R. Mosteo
2000-11-08 0:00 ` Alejandro Villanueva
2000-11-08 0:00 ` Georg Bauhaus
2000-11-09 3:50 ` Ken Garlington
2000-11-07 0:00 ` John English
2000-11-07 0:00 ` John English
2000-11-08 5:22 ` Ken Garlington
2000-11-06 0:00 ` Daniel Allex
2000-11-07 0:00 ` Robert Dewar
2000-11-07 0:00 ` Larry Kilgallen
2000-11-08 0:00 ` Ada student homework ? Nicolas Brunot
2000-11-08 0:00 ` Larry Kilgallen
2000-11-08 0:00 ` Nicolas Brunot
2000-11-08 0:00 ` Brian Rogoff
2000-11-09 0:00 ` Nicolas Brunot
2000-11-09 0:00 ` Robert Dewar
2000-11-10 0:08 ` Ehud Lamm
2000-11-10 0:00 ` Brian Rogoff
2000-11-08 0:00 ` Lao Xiao Hai
2000-11-09 0:00 ` Nicolas Brunot
2000-11-09 0:00 ` Lao Xiao Hai
2000-11-10 0:00 ` mjsilva
2000-11-10 0:00 ` Nicolas Brunot
2000-11-10 0:00 ` Marin David Condic
2000-11-10 0:00 ` Nicolas Brunot
2000-11-10 0:00 ` David Starner
2000-11-11 0:00 ` Robert Dewar
2000-11-13 0:00 ` Nicolas Brunot
2000-11-10 0:00 ` Ole-Hjalmar Kristensen
2000-11-10 0:00 ` Randy Brukardt
2000-11-11 0:00 ` Marin David Condic
2000-11-15 0:00 ` Lao Xiao Hai
2000-11-18 0:00 ` Robert Dewar
2000-11-18 0:00 ` tmoran
2000-11-19 0:00 ` Robert Dewar
2000-11-19 0:00 ` tmoran
2000-11-19 0:00 ` Robert Dewar
2000-11-20 0:16 ` tmoran
2000-11-20 0:00 ` Portability accross compilers Nicolas Brunot
2000-11-20 0:00 ` Robert Dewar
2000-11-20 3:18 ` Ada student homework ? Robert Dewar
2000-11-20 5:55 ` tmoran
2000-11-20 0:00 ` Robert Dewar
2000-11-20 0:00 ` Wes Groleau
2000-11-19 0:00 ` Lao Xiao Hai
2000-11-11 0:00 ` Robert Dewar
2000-11-13 0:00 ` gdemont
2000-11-10 0:00 ` Nicolas Brunot
2000-11-10 0:00 ` Larry Kilgallen
2000-11-10 0:00 ` Nicolas Brunot
2000-11-10 0:00 ` Dan Nagle
2000-11-10 0:00 ` Nicolas Brunot
2000-11-10 0:00 ` Larry Kilgallen
2000-11-10 0:00 ` Nicolas Brunot
2000-11-11 0:00 ` Robert Dewar
2000-11-12 6:54 ` Brian Rogoff
2000-11-12 0:00 ` Robert Dewar
2000-11-11 0:00 ` Robert Dewar
2000-11-13 0:00 ` Nicolas Brunot
2000-11-13 0:00 ` Robert Dewar
2000-11-13 0:00 ` gdemont
2000-11-13 0:00 ` Ken Garlington
2000-11-13 0:00 ` gdemont
2000-11-13 0:00 ` Ada student homework ?[OS/2 Comments] tjerick
2000-11-14 0:00 ` Ada student homework ? Georg Bauhaus
2000-11-14 5:16 ` Robert Dewar
2000-11-14 0:00 ` Nicolas Brunot
2000-11-15 0:00 ` Robert Dewar
2000-11-15 0:00 ` Ada student homework ? I give up Nicolas Brunot
2000-11-15 0:00 ` Robert Dewar
2000-11-14 0:00 ` Ada student homework ? John English
2000-11-14 0:00 ` gdemont
2000-11-14 0:00 ` Ole-Hjalmar Kristensen
2000-11-13 0:00 ` Nicolas Brunot
2000-11-13 0:00 ` Pascal Obry
2000-11-14 0:00 ` dmitry6243
2000-11-15 0:00 ` Larry Kilgallen
[not found] ` <3A0FCBAD.824095C6@cadwin.cOrganization: LJK Software <5E93Ivxu6GwO@eisner.decus.org>
2000-11-18 0:00 ` Robert Dewar
2000-11-20 0:00 ` Wes Groleau
2000-11-20 0:00 ` Larry Kilgallen
2000-11-08 0:00 ` Chad R. Meiners
2000-11-08 0:00 ` Ted Dennison
2000-11-09 5:11 ` Robert Dewar
2000-11-18 0:00 ` John Magness
2000-11-09 5:04 ` Robert Dewar
2000-11-10 0:27 ` Subsetting Ada Ted Dennison
2000-11-08 0:00 ` Ada student homework ? Robert Dewar
2000-11-08 0:00 ` Nicolas Brunot
2000-11-08 0:00 ` Larry Kilgallen
2000-11-08 0:00 ` Nicolas Brunot
2000-11-14 0:00 ` Ronald Cole
2000-11-08 0:00 ` Ted Dennison
2000-11-08 0:00 ` Lao Xiao Hai
2000-11-08 0:00 ` Nicolas Brunot
2000-11-08 0:00 ` Jerry Petrey
2000-11-09 0:00 ` Marin David Condic
2000-11-10 2:15 ` Ken Garlington
2000-11-10 0:00 ` Marin David Condic
2000-11-18 0:00 ` John Magness
2000-11-19 0:00 ` Robert Dewar
2000-11-19 0:00 ` Larry Kilgallen
2000-11-20 0:00 ` John English
[not found] ` <3A2827A9.B54C260@ebox.tninet.se>
[not found] ` <1dtW5.25958$6W1.1458704@news.flash.net>
2000-12-12 20:52 ` Stefan Skoglund
[not found] ` <dKo%5.144$PE5.16970@read2.inet.fi>
2000-12-19 16:36 ` election chit-chat (was Re: Ada student homework ?) Robert Dewar
2000-11-08 0:00 ` if statements Alejandro Villanueva
2000-11-08 0:00 ` Daniel Allex
2000-11-09 3:54 ` Ken Garlington
2000-11-09 5:24 ` Robert Dewar
2000-11-09 0:00 ` Martin Dowie [this message]
2000-11-09 0:00 ` constants v variables (was Re: if statements) Robert Dewar
2000-11-09 0:00 ` Robert A Duff
2000-11-09 0:00 ` Florian Weimer
2000-11-10 2:13 ` Ken Garlington
2000-11-10 5:59 ` Brian Rogoff
2000-11-09 0:00 ` Martin Dowie
2000-11-09 0:00 ` Robert Dewar
2000-11-09 0:00 ` if statements Ken Garlington
2000-11-09 0:00 ` Robert Dewar
2000-11-10 0:12 ` Ehud Lamm
2000-11-10 2:09 ` Ken Garlington
2000-11-20 0:00 ` Wes Groleau
2000-11-20 0:00 ` Wes Groleau
2000-11-21 0:00 ` Robert Dewar
2000-11-22 0:00 ` Wes Groleau
2000-11-09 0:00 ` Marin David Condic
2000-11-09 0:00 ` Robert Dewar
2000-11-10 0:00 ` Larry Kilgallen
2000-11-10 1:58 ` Ken Garlington
2000-11-10 3:53 ` Robert Dewar
2000-11-07 0:00 ` dmitry6243
2000-11-07 0:00 ` Jean-Pierre Rosen
2000-11-08 0:00 ` dmitry6243
2000-11-07 0:00 ` John English
2000-11-07 0:00 ` Ken Garlington
2000-11-07 0:00 ` John English
2000-11-07 0:00 ` Robert Dewar
2000-11-08 0:00 ` John English
2000-11-08 0:00 ` Georg Bauhaus
2000-11-09 4:58 ` Robert Dewar
2000-11-09 0:00 ` John English
2000-11-09 0:00 ` Ken Garlington
2000-11-09 0:00 ` Designing test suites (was: if statements) Larry Kilgallen
2000-11-08 5:29 ` if statements Ken Garlington
2000-11-08 0:00 ` John English
2000-11-08 0:00 ` Ken Garlington
2000-11-07 0:00 ` Wes Groleau
2000-11-08 0:00 ` John English
2000-11-08 0:00 ` Wes Groleau
2000-11-09 3:43 ` Ken Garlington
2000-11-07 0:00 ` John English
2000-11-07 0:00 ` Robert Dewar
2000-11-10 6:09 ` DJack143
2000-11-11 0:00 ` Here we go again (Was: if statements) Frank Christiny
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