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Path: ...!news.misty.com!news.iecc.com!.POSTED.news.iecc.com!not-for-mail From: John Levine <johnl@taugh.com> Newsgroups: comp.arch Subject: Re: Keeping other stuff with addresses (was: What is an N-bit machine?) Date: Sat, 30 Nov 2024 19:12:13 -0000 (UTC) Organization: Taughannock Networks Message-ID: <vifo2d$19lu$1@gal.iecc.com> References: <memo.20241128153105.12904U@jgd.cix.co.uk> <2024Nov30.175756@mips.complang.tuwien.ac.at> <20241130193206.00005c49@yahoo.com> <2024Nov30.190858@mips.complang.tuwien.ac.at> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Date: Sat, 30 Nov 2024 19:12:13 -0000 (UTC) Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="42686"; mail-complaints-to="abuse@iecc.com" In-Reply-To: <memo.20241128153105.12904U@jgd.cix.co.uk> <2024Nov30.175756@mips.complang.tuwien.ac.at> <20241130193206.00005c49@yahoo.com> <2024Nov30.190858@mips.complang.tuwien.ac.at> Cleverness: some X-Newsreader: trn 4.0-test77 (Sep 1, 2010) Originator: johnl@iecc.com (John Levine) Bytes: 2319 Lines: 24 According to Anton Ertl <anton@mips.complang.tuwien.ac.at>: >>> >>>>These days I'd say the relevant N is the size of arithmetic >>> >>>>registers but a lot of marketers appear to disagree with me. >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. Jeez, who knew you were a chip salesman. I meant the main registers, for some straightforward version of main. You are of course correct that there are special purpose registers that are much wider but I don't think it's all that hard to see which ones I meant. Everyone agreed that all the models of S/360 were 32 bit machines, but the implementations ranged from 8 bits for the /25 and /30 to 64 bits for the /75. I don't think it's very useful to argue about whether the various models of 360 were 8, 16, 32, or 64 bit machines. -- Regards, John Levine, johnl@taugh.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. https://jl.ly