[R-SIG-Mac]R and Altivec

Jan de Leeuw deleeuw@stat.ucla.edu
Mon, 5 Nov 2001 13:05:12 -0800

I don't think so. R does not have single precision either. The Darwin/X11
version (at lest the most recent ones) uses the ATLAS libraries from
fink, which do use Altivec for single precision. It's regrettable, but
I don't think it can be fixed easily (of course one could an altivec
version of the Matrix package, for instance).

Current versions of R do not take much advantage of MP machines
either, but I understand there is some work on threading going on.

On Monday, November 5, 2001, at 12:02 PM, David A Richmond wrote:

> Hi,
> 	Ever since the G4 came out I've been interested in the potential
> for number crunching applications to take advantage of altivec, the G4's
> parallel processing unit. It seems like altivec should give the G4 a 
> great
> advantage for these kinds of applications, but I've heard that it's not
> always the case. For instance, I know that Stata isn't altivec optimized
> because Stata works with double precision and altivec is only single
> precision. So I'm wondering, do either of the mac versions of R use
> altivec?
> dave r
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Jan de Leeuw; Professor and Chair, UCLA Department of Statistics
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