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[Gcl-devel] Re: multiple values

From: Camm Maguire
Subject: [Gcl-devel] Re: multiple values
Date: 25 Feb 2006 14:12:08 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Greetings, and thanks!

OK hee is an idea -- the first value can be passed in a register
(i.e. not written to memory at all) using Schelter's scheme.  If
correct, then *eventually*, GCL might capitalize on this, as gcc
allows applications to reserve auxiliary registers for special
purposes like this.  That is, assuming 2 and 3 values is the dominant

Take care,

Robert Boyer <address@hidden> writes:

> One possible conjecture from long ago.  One day Schelter figured out how to
> make use of PROCLAIM tell the compiler to make ordinary user function calls
> go about as fast as c function calls.  However, at least at that time, this
> feature did not work (at least not well) for multiple value returning user
> functions (obviously, since C does not directly support multiple value
> returns).  So Schelter gave to GCL some special feature for ACL2 that worked
> faster than ordinary GCL multiple value returns and took advantage of his
> fast PROCLAIM c-function call, since the ACL2 functions were all PROCLAIMed
> to return only one value.
> Long ago, I think that essentially all KCL user functions took and returned
> all their arguments and all their values via the value stack, and that can be
> slow.
> Just dim mumbling, vague recollections, restatement of the obvious.
> No reply expected or requested.
> Bob

Camm Maguire                                            address@hidden
"The earth is but one country, and mankind its citizens."  --  Baha'u'llah

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