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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: seperate keyword and seperate compilation with Gnat?
Date: 1996/07/15
Message-ID: <dewar.837438444@schonberg>#1/1
X-Deja-AN: 168432267
references: <31D95D93.28D8D15B@jinx.sckans.edu>
  <4rckva$dj1@Starbase.NeoSoft.COM> <JSA.96Jul3200323@organon.com>
  <dewar.836449040@schonberg> <JSA.96Jul5144630@organon.com>
  <dewar.836627714@schonberg> <JSA.96Jul9172451@organon.com>
  <dewar.836964568@schonberg> <JSA.96Jul11154350@organon.com>
  <dewar.837148752@schonberg> <4sb4av$ful@watnews1.watson.ibm.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-07-15T00:00:00+00:00
List-Id: <comp.lang.ada>


Norman asked:

"I presume you mean that it is invalid to compute a+b this way because of
the potential overflow, and not that it is invalid to raise an exception
because of the overflow."

Well not quite, it is not invalid to compute a+b that way, it is invalid
to compute a+b that way if it will indeed raise an exception. If you
compute a+b that way (4 * a + b - 3 * a), and you do not raise an exception
during the computation (as is allowed by the optimization rules), then this
is a stupid and inefficient thing to do, but is not invalid.