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: "[email protected]" <[email protected]> To: "[email protected]" <[email protected]> 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 <[email protected]> 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: "[email protected]" <[email protected]> > To: "[email protected]" <[email protected]> > 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. > _______________________________________________ > Simh mailing list > [email protected] > http://mailman.trailing-edge.com/mailman/listinfo/simh _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
