[m-dev.] x86-64 architecture support
Peter Schachte
schachte at cs.mu.OZ.AU
Mon Aug 29 10:33:28 AEST 2005
On Sat, Aug 27, 2005 at 09:41:42AM +1000, Zoltan Somogyi wrote:
> On 26-Aug-2005, Peter Hawkins <peter at hawkins.emu.id.au> wrote:
> > It seems the 64-bit version is somewhat slower, despite having an extra
> > global register variable.
>
> But the data has become twice as big. This has the same effect as
> cutting the cache size in half.
But wouldn't this argument suggest that everything data cache-bound
would be markedly slower using 64 bit code? I understand the typical
experience is that the athlon 64 runs around 30% faster when compiled
for 64 bit code.
--
Peter Schachte We women say "we love you men, we really love you,
schachte at cs.mu.OZ.AU but we say to you move over," and if we take the
www.cs.mu.oz.au/~schachte/ world and we make it any worse than you have, then
Phone: +61 3 8344 1338 we will give it back. -- Betty Williams
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