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From: Thomas Koenig <tkoenig@netcologne.de>
Newsgroups: comp.arch
Subject: Re: Keeping other stuff with addresses (was: What is an N-bit
 machine?)
Date: Sat, 30 Nov 2024 22:06:37 -0000 (UTC)
Organization: A noiseless patient Spider
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Message-ID: <vig29d$1v4ll$1@dont-email.me>
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Anton Ertl <anton@mips.complang.tuwien.ac.at> schrieb:
> 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.

Can you do a 512-bit addition with it natively?

> Sure, they are used for arithmetic on a
> sequence of individually narrower data, but the registers have 512
> bits nonetheless.

So, more of a 64-bit system.