SPARC tagged data

horst@techfak.uni-bielefeld.de
Mon, 29 Apr 91 17:42:10 MET DST

          From comp.compilers
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SPARC tagged data horst@techfak.uni-bielefeld.de (1991-04-29)
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Re: SPARC tagged data moss@cs.umass.edu (1991-04-30)
Re: SPARC tagged data weitek!weaver@Sun.COM (1991-04-30)
Re: SPARC tagged data kers@otter.hpl.hp.com (1991-05-07)
Re: SPARC tagged data pardo@june.cs.washington.edu (1991-05-08)
Re: SPARC tagged data henry@zoo.toronto.edu (1991-05-09)
[1 later articles]
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Newsgroups: comp.compilers,comp.arch
From: horst@techfak.uni-bielefeld.de
Keywords: architecture, SPARC
Phone: +49-521-106-2908
Organization: University of Bielefeld, P.O.Box 8640, W4800 Bielefeld 1, GERMANY
Date: Mon, 29 Apr 91 17:42:10 MET DST

Does anyone know what TAGGED DATA instructions are useful for and how to
use them? Tagged data is assumed to be 30 bits wide followed by trwo bits
set to zero. The SPARC allows add and subtract instructions on tagged
data.


HH
[Most likely it's for immediate integers in a Lisp-like system that uses
tagged pointers, but I hope someone who actually knows will tell us. -John]
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