Re: Ada 83 - avoiding unchecked conversions.

[eachus@spectre.mitre.org (Robert I. Eachus)]

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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