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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Simple Real_Time.Time_Span question
Date: 1998/10/14
Message-ID: <EACHUS.98Oct14135537@spectre.mitre.org>#1/1
X-Deja-AN: 401058120
References: <6vvsgo$rvo$1@nnrp1.dejanews.com>
 <700usk$cht$1@nnrp1.dejanews.com> <702b25$30a$1@nnrp1.dejanews.com>
Organization: The Mitre Corp., Bedford, MA.
Newsgroups: comp.lang.ada
Date: 1998-10-14T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <702b25$30a$1@nnrp1.dejanews.com> dennison@telepath.com writes:

  > I hate to drag my own thread off topic, but how did you do that?
  > According to 9.6(27) Duration has to represent up to 86,400
  > seconds. For a "classical" implementation of a fixed-point type
  > that can represent both 86,400 and 0.000_000_001, my poor
  > calculations tell me you'd need at least 47 bits. On a 32-bit
  > processor that would be tricky.

   You use 64-bits, and when necessary, multiprecision arithmetic.
Remember that on many 32-bit processors, addition and subtraction of
64-bit numbers is either supported directly in the instruction set, or
through instructions like add-with-carry.
--

					Robert I. Eachus

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