[Simh] Is Alpha AXP in SIMH's future?

[Sergey Oboguev]

My comment was is not about Intel vs. non-Intel, but about having 64-bit as a
native type in host machine instructions and leveraged by the compiler, rather
than simulated by 32-bit host operations.

Just consider how let us say LDQ or ADDQ would actually be implemented
in each of the respective cases.



________________________________
From: "lists at openmailbox.org" <lists at openmailbox.org>
To: "Simh at trailing-edge.com" <Simh at trailing-edge.com> 
Sent: Tuesday, March 3, 2015 12:56 PM
Subject: Re: [Simh] Is Alpha AXP in SIMH's future?


Hi,

I don't understand (a) unless this is referring specially to Intel. For (b)
I didn't imagine needing so much memory for a guest.

Right now I'm running SIMH on a MIPS III (64 bit) box under OpenBSD and on
Solaris SPARC (sun4u). SIMH builds and runs on everything I have. I don't
use Windows and my Linux box is 32 bit for a few things that don't run
elsewhere. From my view it would be fantastic to have SIMH support an Alpha
emulator because SIMH doesn't require particular hosts.


On Tue, 3 Mar 2015 12:44:03 -0800
Sergey Oboguev <oboguev at yahoo.com> wrote:

> The downside of running a 32-bit version of virtually any AXP simulator
> is that it is bound to be 2-3 times slower than 64-bit version, due to
> 
> (a) simulation of AXP 64-bit operations on top of 32-bit host operations,
> 
> (b) indirect access to guest memory when it is sized above 2 GB or so
>     assuming such an access is implemented at all.
> 
> The only exception to (a) would be a 64-bit simulator squeezed into 32-bit
> environment running on 64-bit machine, but this is hardly worth the
> effort.
> 
> 
> ----- Original Message -----
> From: "lists at openmailbox.org" <lists at openmailbox.org>
> To: "Simh at trailing-edge.com" <Simh at trailing-edge.com>
> Cc: 
> Sent: Tuesday, March 3, 2015 9:25 AM
> Subject: [Simh] Is Alpha AXP in SIMH's future?
> 
> Is an Alpha machine capable of running OpenVMS in SIMH's future? I know
> there are several Alpha emulators for Linux and Windows but I really like
> SIMH since it runs on pretty much any UNIX-like OS and doesn't depend on
> having a 64-bit Linux installed.
> 
> Thank you for SIMH.
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