From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Can compilers do this?
Date: 1996/02/23
Date: 1996-02-23T00:00:00+00:00 [thread overview]
Message-ID: <dewar.825137225@schonberg> (raw)
In-Reply-To: 4gjd6g$mfq@newsbf02.news.aol.com
To follow up BwB's question
"Also, suppose Y and X are floating point variables, and M and B are
CONSTANT floating point variables (not named numbers) initialized to
1.0 and 0.0 respectively. If one writes
Y := M * X + B ;
can (and will) any compiler reduce this to
Y := X ;"
They do not even have to be CONSTANT floating point variables, the
compiler may well be able to figure out the current values of
variables without them being CONSTANT.
If indeed they are constant, I cannot imagine any compiler that would
NOT do the optimization you suggest. Any compiler that did not is
broken if you ask me!
next prev parent reply other threads:[~1996-02-23 0:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-02-22 0:00 Can compilers do this? BWBurnsed
1996-02-23 0:00 ` Mark A Biggar
1996-02-24 0:00 ` Robert A Duff
1996-02-23 0:00 ` Robert Dewar
1996-02-25 0:00 ` Robert Dewar
1996-02-23 0:00 ` Robert Dewar
1996-02-23 0:00 ` Stuart Palin
1996-02-23 0:00 ` Robert Dewar [this message]
1996-02-23 0:00 ` Cordes MJ
1996-02-26 0:00 ` Robert I. Eachus
1996-02-26 0:00 ` BWBurnsed
-- strict thread matches above, loose matches on Subject: below --
1996-02-26 0:00 Marin David Condic, 407.796.8997, M/S 731-93
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