On Tue, 19 Dec 2006, Duncan Murdoch wrote: > On 12/19/2006 4:16 PM, Benjamin Tyner wrote: >> Thanks; I'm on 32-bit linux, but it's good to know the behavior on >> Windows. Do you know a way to force "floor" to use this reduced precision? > > Force the value to be stored to a "double" and it will get the reduced > precision. You can do this by assigning it to a numeric variable in R > and then passing it back; you can presumably do it by some trickery in > your compiler, but watch out for optimizations that leave it in an 80 > bit register the whole time.
In C, declaring a value as 'volatile' should force it to be stored in a 64-bit memory location. There is no known way to do this in Fortran: compilers and numeric software have been playing leapfrog games for years. What you can do with gcc (the compiler collection) is to compile a module with -ffloat-store, as we do with dlamc.f. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
