Re: [Gcl-devel] arrays

[Camm Maguire]

Greetings!

Vanuxem Grégory <address@hidden> writes:

> > -----Message d'origine-----
> > De : Camm Maguire [mailto:address@hidden
> > Envoyé : mardi 6 septembre 2005 16:05
> > À : Vanuxem Grégory
> > Cc : address@hidden
> > Objet : Re: [Gcl-devel] arrays
> >
> >
> > Greetings!
> >
> > Vanuxem Grégory <address@hidden> writes:
> >
> > > Le lundi 05 septembre 2005 à 13:42 +0200, Vanuxem Grégory a écrit :
> > > > Le dimanche 04 septembre 2005 à 23:38 -0400, Camm Maguire a écrit :
> > > > > Greetings!
> > > > >
> > > > > What is '(array nil) suposed to mean?
> > > > >
> > > > > I noticed that cmucl has support for 1 2 4 8 16 and 32bit array
> > > > > integers.  GCL has 1, 8, 16 and 32 (on 32bit machines).
> > > >
> > > > Is it possible to send a 32 bits static array to cline ?
> > > >
> > > > I have stopped my lapack implementation, since on my 64 bits machine,
> > > > arrays of int are array of long (8 bytes), and this will probably not
> > > > change in the future.
> > >
> > > And if i use (on a 64 bit arch) :
> > >
> > > (setq a (make-array  '(5 5) :element-type 'long-float :static t))
> > > (setq ipiv (make-array  5 :element-type '(signed-byte 32) :static t))
> > >
> > > #(0 0 0 0 0)
> > >
> > > >(dgetrf 5 5 a 5 ipiv)
> > >
> > > 1
> > >
> > > >ipiv
> > >
> > > #(8589934593 17179869187 5 0 0)
> > >    ^^^^^^^^^ ^^^^^^^^^^^
> > >
> > > the array contains '(signed-byte 64) even if that don't exist.
> > >
> >
> >
> 
> > OK, not sure what you men about 'not existing',
> 
> (setq ipiv (make-array  5 :element-type '(signed-byte 64) :static t))
>  #(NIL NIL NIL NIL NIL)
> 
> > but it is true that
> > the 64bit port has only 1,8,16,and 64 bit integer array support, and I
> > can see the need for a 32bit here as well.  Do you need a patch
> > against 2.6.7, or can you deal with the work-in-progress 2.7.0 from
> > cvs?
> 
> I will deal with the work in progress (2.7.0), thanks.
> 

Just a note -- 32bit array types on 64bit systems should now be in cvs
head, though not yet thoroughly tested.  Please let me know if there
are problems.

Take care,




> Cheers,
> 
> Greg
> 
> >
> > Take care,
> >
> > >
> > >
> > > Cheers,
> > >
> > > Greg
> > >
> > >
> > > > >
> > > > > 1) Is there any real benefit to 2 and 4 bit integer types,
> > considering
> > > > >    the access overhead vs space tradeoff?
> > > > > 2) My understanding is that the simple (signed-byte
> > > > >    2^n),(unsigned-byte 2^n) strategy will not pass all Paul's tests,
> > > > >    as upgraded-array-element-type must preserve subtypep
> > relationships
> > > > >    -- one needs at least (unsigned-byte 2^n-1), etc.
> > > > >    I.e. non-negative-char, signed-char, and (optionally) (unsigned
> > > > >    char) for each size type.  This is what I've implemented at
> > > > >    present, and I'm passing all relevant tests.  I'd
> > obviously like to
> > > > >    support the minimum number of types possible, if for no other
> > > > >    reason than it slows down subtypep et. al. on (array *).
> > > > >
> > > > > Take care,
> > > > >
> > > >
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > Gcl-devel mailing list
> > > > address@hidden
> > > > http://lists.gnu.org/mailman/listinfo/gcl-devel
> > > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > Gcl-devel mailing list
> > > address@hidden
> > > http://lists.gnu.org/mailman/listinfo/gcl-devel
> > >
> > >
> > >
> >
> > --
> > Camm Maguire                                                address@hidden
> > ==========================================================================
> > "The earth is but one country, and mankind its citizens."  --  Baha'u'llah
> >
> 
> 
> 
> 
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> 

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