Why is 64 bit faster. RE: [Beowulf] Win64 Clusters!!!!!!!!!!!!

Greg Lindahl lindahl at pbm.com
Sat Apr 14 13:25:26 EDT 2007


On Sat, Apr 14, 2007 at 01:55:21AM -0600, Andrew Shewmaker wrote:

> People have mentioned the extra registers you get when going to
> x86-64, but I don't
> think anyone mentioned how that was related to the x87 unit.  x86-64's ABI
> forces people off of the x87 unit (mostly), and that's a good thing
> for several reasons.

The two issues (extra registers and x87) aren't related. And most HPC
people have been avoiding the x87 for a long, long time.

-- greg

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