[Simh] VAX emulation issues on Raspberry Pi

[Paul Koning]

> On Jul 31, 2018, at 9:33 AM, Robert Armstrong <bob at jfcl.com> wrote:
> 
>> My Raspberry Pi 2 clocks in at about 1.6 VUPS, my ESXI host is a 
>> i7-3770 CPU @ 3.40GHz (which is starved for RAM), SIMH/VAX on a VM 
>> running on it clocks in at about 34.6 VUPS.  I have a i5-3470 @ 3.2Ghz 
>> and SIMH runs at about 31.6 VUPS
> 
>  FWIW, this may also say something about the quality of the code generation in gcc for ARM vs x86 processors, or it may even say something about the relative efficiency of those two architectures.

One thing worth doing is to use the latest gcc.  Code generation keeps improving, and it's likely that architectures such as ARM see significant benefits in newer releases.

	paul