Re: [R] Compiling R to run natively on Windows x64

From: Prof Brian Ripley <>
Date: Sat 20 Aug 2005 - 03:18:44 EST

On Thu, 18 Aug 2005, Alastair Cooper wrote:

> I am looking at getting a PC preinstalled with Windows XP x64. What I
> want to know is, has anyone successfully compiled a version of R for
> 64-bit Windows (Amd64 - not Itanium), and if so did they find any
> performance boost?

Hmm, where do you get a reliable C99-compatible compiler for 64-bit Windows? We don't know of one, and the R sources are written assuming long is 64-bit on a 64-bit platform (and that is not the Win64 convention) so there would still be a lot of 32-bit restrictions until we change that (which is on my TODO list).

(We don't support building R with VC++, and although there have been a number of attempts none has produced a version that passes make check: I recall finding VC++ thought -Inf > 3, for example.)

Based on extensive experience on other platforms, I would expect a noticeable performance hit for a 64-bit build, but the ability to run bigger tasks: this is discussed with data and reasoning in the latest R-admin manual (in the R-devel version of R).

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Sat Aug 20 03:27:01 2005

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