On Mon, Nov 12, 2007 at 11:46:12AM -0600, Scott Marlowe wrote:
> On Nov 12, 2007 11:37 AM, Sam Mason <sam@samason.me.uk> wrote:
> > And what's the performance hit of using native 64bit code? I'd guess
> > similar, moving twice as much data around with each pointer has got to
> > affect things.
>
> That's not been my experience. It's not like everything you do
> requires 64 bits to be moved where in 32 bit code only 32 were moved.
> The performance gain of the 64 bit machine doing 64 bit operations
> over the 32 bit machine doing them (i.e. floating point etc...) is so
> much more that it more than makes up for the overhead of running in 64
> bit mode.
OK, I'm willing to believe you. It used to be a big misunderstanding
that moving to 64bits automatically speed things up, things like this
change though.
Sam