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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Ada 83 - avoiding unchecked conversions.
Date: 1996/12/19
Message-ID: <EACHUS.96Dec19140825@spectre.mitre.org>#1/1
X-Deja-AN: 204981574
references: <md5:8B831999BCF200C6E70994BDF6CC529F> <32AED68A.48BE@aisf.com>
organization: The Mitre Corp., Bedford, MA.
newsgroups: comp.lang.ada
Date: 1996-12-19T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <32B6905F.FC4@tiac.net> Eric Miller <ewmiller@tiac.net> writes:

  > I used to work at the same company as a guy who was having
  > problems with a program that ran (essentially in batch) for
  > several hours.  One of his optimizations was to switch all the
  > unchecked conversions to conversions using overlays.  Apparently
  > on that compiler (VAX Ada 1.something) unchecked conversion was
  > doing some checks.

   As I remember it, early versions of VAX Ada flushed stored state in
the compiler in a couple of cases where it later turned out not to be
needed.  As I remember it, two cases were on all statement labels and
on all subprogram calls, even if inlined.  This caused the stack
pointer to be reloaded.


--

					Robert I. Eachus

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function Message (Text: in Clever_Ideas) return Better_Ideas is...