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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.arch
Subject: Re: Keeping other stuff with addresses (was: What is an N-bit
 machine?)
Date: Sat, 30 Nov 2024 20:28:51 +0200
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On Sat, 30 Nov 2024 18:08:58 GMT
anton@mips.complang.tuwien.ac.at (Anton Ertl) wrote:

> Michael S <already5chosen@yahoo.com> writes:
> >On Sat, 30 Nov 2024 16:57:56 GMT
> >anton@mips.complang.tuwien.ac.at (Anton Ertl) wrote:
> >  
> >> Thomas Koenig <tkoenig@netcologne.de> writes:  
> >> >Anton Ertl <anton@mips.complang.tuwien.ac.at> schrieb:    
> >> >> anton@mips.complang.tuwien.ac.at (Anton Ertl) writes:    
> >> >>>John Levine <johnl@taugh.com> writes:    
> >> >>>>These days I'd say the relevant N is the size of arithmetic
> >> >>>>registers but a lot of marketers appear to disagree with me.
> >> >>>> 
> ...
> >John Levine said "arythmetic". Not logic, not move, not swizzle, not
> >load/store. The widest arythmetic on Intel/AMD is 64 bits for inputs
> >and 128 bits for output (integer multiplication).  
> 
> The widest arithmetic registers on AMD64 with AVX-512 are the ZMM
> registers with 512 bits each.  Sure, they are used for arithmetic on a
> sequence of individually narrower data, but the registers have 512
> bits nonetheless.
> 
> - anton

8x64 is not the same as 512. 
You don't call 2-way superscalar 64-bit CPU 128-bit.