PSIM/PowerPC related questions (G4/e500/AltiVec)

[kgardas at objectsecurity.com (Karel Gardas)]

Hello,

I've been recently looking into PSIM as a possibility to emulate PowerPC 
system running RTEMS. To my surprise, this the oldest free emulator seems 
to be quite capable. As is well known, PSIM emulates 603 and 604 
processors. What surprised me a bit, is a presentation (in source code) of 
also Altivec and e500 instruction set emulation. My question is: when 
someone take 604 processor and adds Altivec emulation, is the final result 
G4? If not, what's missing?

Thanks,
Karel
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Karel Gardas                  kgardas at objectsecurity.com
ObjectSecurity Ltd.           http://www.objectsecurity.com