Supporting more than one CPU with the same gas port.

[Sean Keys]

I have a general question when it comes to supporting more than one core 
with the same assembler(tc-x).  I have seen gas support multiple 
variants of the same cores with within one assembler which makes good 
sense to me, but what about different CPUs all together?  Is it common 
for one assembler to support more than one different programming model? 
It seems fundamentally wrong to try to support two different 
architectures using the same code base.

-sean