[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
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