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c.f. bug 424647
List Archive: gentoo-sparc
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To: "David F. Newman" <dnewman@...>
From: Ciaran McCreesh <ciaranm@g.o>
Subject: Re: sparc64 userland
Date: Mon, 20 Sep 2004 19:31:30 +0100
On Mon, 20 Sep 2004 14:25:53 -0400 "David F. Newman" <dnewman@...>
wrote:
| No, I have no reason aside from pure geek value.  I was under the,
| probably false, impression that sparc64 executables could move data
| around faster.  i.e. doubles could be loaded in fewer clock cycles. 
| So I have 2 questions that maybe you can answer,
| 
| 1) Is the only advantage to a sparc64 executable access to memory
| larger than 2G per process?

Pretty much.

| 2) Assuming yes to question 1, then what is with the hype with 64bit
| processors?

x86/amd64 isn't like sparc/sparc64. amd64 CPUs are fast because they
have larger cache and a whole bunch of extra registers, not because
they're 64bit. On sparc, we can gain pretty much all the advantages of a
v9 CPU whilst still running a 32bit userland.

But then, "four times as many general purpose registers!" just doesn't
sound as cool as "64 bit!".

-- 
Ciaran McCreesh : Gentoo Developer (Sparc, MIPS, Vim, Fluxbox)
Mail            : ciaranm at gentoo.org
Web             : http://dev.gentoo.org/~ciaranm

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Re: sparc64 userland
-- David F. Newman
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Updated Jun 17, 2009

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