From: telesoft!garym@uunet.uu.net (Gary Morris @pulsar)
Subject: Re: Enumerations
Date: 20 Sep 92 22:32:28 GMT [thread overview]
Message-ID: <1992Sep20.223228.4176@telesoft.com> (raw)
In <1992Sep19.004035.22312@sei.cmu.edu> Goodenough@sei.cmu.edu (John Goodenough
) writes:
>The one case in which you might expect a compiler to provide a default
>enumeration representation different from that of the position number is for
>the predefined type BOOLEAN. My understanding is that on some architectures
>it can be more efficient to code FALSE as a negative number (e.g., all ones)
>and TRUE as a non-negative number (e.g., all zeroes).
This is true on the 68000 family processors, using 0 for false and -1 for
true is more efficient that 0 and 1. Our current 68020 code generator takes
advantage of this.
--GaryM
--
Gary Morris Internet: garym@telesoft.com
Ada Software Development UUCP: uunet!telesoft!garym
TeleSoft, San Diego, CA Phone: +1 619-457-2700
next reply other threads:[~1992-09-20 22:32 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
1992-09-20 22:32 Gary Morris @pulsar [this message]
-- strict thread matches above, loose matches on Subject: below --
1992-09-22 14:27 Enumerations Chris Elliott
1992-09-19 2:31 Enumerations Michael Feldman
1992-09-19 1:18 Enumerations Mark A Biggar
1992-09-19 0:40 Enumerations John Goodenough
1992-09-18 17:54 Enumerations Michael Feldman
1992-09-18 15:41 Enumerations Mark A Biggar
1992-09-18 1:39 Enumerations Michael Feldman
1992-09-17 23:40 Enumerations Kevin Simonson
1992-09-17 22:26 Enumerations Darren Davenport 283-4173
1992-09-17 21:20 Enumerations david.c.willett
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