I would guess compared to Intel's first line of "x86" 64bit CPU's,
the Intanium's which had a 32 bit "emulation" mode which took serious
performance hits.
I haven't seen much on what their (Intel) new line of x86_em64 chips
are like now though.
Jacob Bresciani
"Passwords are like bubble gum, strongest when fresh, should never be
used by groups and create a sticky mess when left laying around"
-anon
On Sep 19, 2005, at 10:38 AM, Paul Brook wrote:
They can natively run 32 bit stuff with NO speed penalities
No speed penalty compared to what?
Amd64 chips do run 32-bit code "natively", and are competitive as
32-bit CPUs
in their own right. However you usually get a speed increase from
recompiling
as a 64-bit app. In 64-bit mode you have more registers and 64-bit
arithmetic, which allow the compiler can generate more efficient code.
From what I've seen 64-bit apps tend to be ~10% faster then the 32-bit
equivalent.
Paul
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