Author: Robert Hyatt
Date: 20:50:11 06/29/03
Go up one level in this thread
On June 29, 2003 at 06:35:02, Tony Werten wrote: >On June 28, 2003 at 14:23:50, Robert Hyatt wrote: > >>On June 28, 2003 at 12:12:15, Jay Urbanski wrote: >> >>>On June 28, 2003 at 10:33:45, Robert Hyatt wrote: >>> >>>>Those are not true 64 bit processors. Supposedly 32 bit stuff runs just >>>>fine on them, but they have 64 bit extensions. >>> >>>How is Opteron not a true 64-bit processor? >> >> >>Because it executes 32 bit instructions _also_. > >P4 and AMD also execute 16-bit instructions, so they are 16 bit processors ? Not pure 16 bit no. Not pure 32 either. Check out "Cray" for a better example of a pure architecture. All math is 64 bits. All address arithmetic is 32 bits. Different instructions, functional units, and registers for each. No kludges about gating 32 bits with 32 high-end zeroes and that kind of stuff. But in the case of opteron, at least at first look, it appears to be a 32 bit machine with 64 bit instructions layered on top. > >BTW mov al,value is an 8 bit instruction so .... There are even single bit instructions. But I wasn't talking about that side of things... > >Tony > >> >>IE it is X86 compatible.
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