From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Simple Real_Time.Time_Span question
Date: 1998/10/14
Date: 1998-10-14T00:00:00+00:00 [thread overview]
Message-ID: <EACHUS.98Oct14135537@spectre.mitre.org> (raw)
In-Reply-To: 702b25$30a$1@nnrp1.dejanews.com
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
with Standard_Disclaimer;
use Standard_Disclaimer;
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next prev parent reply other threads:[~1998-10-14 0:00 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-10-13 0:00 Simple Real_Time.Time_Span question dennison
1998-10-13 0:00 ` David C. Hoos, Sr.
1998-10-13 0:00 ` dennison
1998-10-14 0:00 ` Niklas Holsti
1998-10-14 0:00 ` Niklas Holsti
1998-10-14 0:00 ` Robert I. Eachus
1998-10-14 0:00 ` Keith Thompson
1998-10-14 0:00 ` Jonathan Guthrie
1998-10-15 0:00 ` dennison
1998-10-16 0:00 ` Tucker Taft
1998-10-16 0:00 ` dennison
1998-10-16 0:00 ` dewar
1998-10-17 0:00 ` Niklas Holsti
1998-10-13 0:00 ` dennison
1998-10-13 0:00 ` Tucker Taft
1998-10-14 0:00 ` dewar
1998-10-14 0:00 ` dennison
1998-10-14 0:00 ` Matthew Heaney
1998-10-14 0:00 ` Robert I. Eachus [this message]
1998-10-15 0:00 ` dennison
1998-10-16 0:00 ` Robert I. Eachus
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