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

[Mark Pizzolato - Info Comm]

On Tuesday, March 3, 2015 at 11:16 PM, lists at openmailbox.org wrote:
> On Tue, 3 Mar 2015 13:34:51 -0800
> Sergey Oboguev <oboguev at yahoo.com> wrote:
> 
> > 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.
> 
> I thought there was no direct way to do math on 64 bit integers in 32 bit
> Intel and simulation by 32 bit host operations (add, adc) would be
> required, as opposed to other platforms which (I believe) have instructions
> for 64 bit integer math even in 32 bit mode (i.e. SPARC).

That is exactly Sergey's point.  Running a 64bit simulator on a 32bit Intel platform (even with a compiler which has 64bit types) will be significantly slower than running a simulator compiled for a 64bit host.

- Mark